GE Industrial Solutions QBDW025A0B User Manual

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Data Sheet

QBDW025A0B Barracuda* Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

RoHS Compliant

Features

 Compliant to RoHS II EU “Directive 2011/65/EU (-Z versions)  Compliant to REACH Directive (EC) No 1907/2006

 High and flat efficiency profile >95.5% at 12V

, 40% to

100% rated output

 Wide input voltage range: 36-75V  Delivers up to 25A

output current

 Remote sense and output voltage trim  Fully very tightly regulated output voltage

to 13.2Vdc

Applications

 Distributed power architectures  Intermediate bus voltage applications  Servers and storage applications  Networking equipment including Power over Ethernet

(PoE)

 Fan assemblies other systems requiring a tightly

regulated output voltage

Options

 Negative Remote On/Off logic (1=option code, factory

preferred)

 Auto-restart after fault shutdown (4=option code, factory

preferred)

 Base plate option (-H=option code)  Passive Droop Load Sharing (-P=option code)

 Output voltage adjust: 8.1V  Low output ripple and noise  Industry standard, DOSA compliant, Quarter brick:

58.4 mm x 36.8 mm x 11.7 mm (2.30 in x 1.45 in x 0.46 in)

 Constant switching frequency  Digital interface with PMBus™ Rev 1.2 Compliance^  Positive remote On/Off logic  Output over current/voltage protection  Digital interface with PMBus™ Rev.1.2 compliance  Over temperature protection  Wide operating temperature range (-40°C to 85°C)

 ANSI/ UL

60950-1-2011 Recognized, CAN/CSA† C22.2 No.60950-1-07, Second Edition + A1:2011 (MOD) Certified IEC 60950-1:2005 (2nd edition) + A1:2009 and EN 609501:2006 + A11:2009 + A1:2010 + A12:2011, and VDE‡ 0805-1 Licensed

 CE mark 2006/96/EC directives  Meets the voltage and current requirements for ETSI 300-

132-2 and complies with and licensed for Basic insulation rating per EN60950-1

 2250 Vdc Isolation tested in compliance with IEEE 802.3

PoE

standards

Description

The QBDW025A0B Barracuda series of dc-dc converters are a new generation of DC/DC power modules designed to support 9.6

-12Vdc intermediate bus applications where multiple low voltages are subsequently generated using point of load (POL) converters, as well as other application requiring a tightly regulated output voltage. The QBDW025A0B series operate from an input voltage range of 36 to 75Vdc and provide up to 25A output current at output voltages from 8.1V standard quarter brick. The converter incorporates digital control, synchronous rectification technology, a fully regulated control topology, and innovative packaging techniques to achieve efficiency approaching 96% peak at 12V power dissipations such that for many applications a heat sink is not required. Standard features include output voltage trim, remote sense, on/off control, output overcurrent and over voltage protection, over temperature protection, input under and over voltage lockout, power good signal and PMBus interface.

The output is fully isolated from the input, allowing versatile polarity configurations and grounding connections. Built-in filtering for both input and output minimizes the need for external filtering.

* Trademark of General Electric Company ^ PMBus name and logo are registered trademarks of SMIF, Inc.

# UL is a registered trademark of Underwriters Laboratories, Inc. † CSA is a registered tradem ark of Canadian Standards Association. ‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.

§ This product is intended for integration into end-user equipme nt . All of the required procedures of end-use equipm ent should be followed. ¤ IEEE and 802 are registered trademarks of the Instit ute of Electrical and Electronics Engineers, Incorporated. ** ISO is a registered trademark of the International O rganization of Standards.

to 12Vdc in a DOSA

output. This leads to lower

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the Data Sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

Parameter Device Symbol Min Max Unit

Input Voltage*

Continuous V

Operating transient  100mS 100 Vdc Non- operating continuous V

Operating Ambient Temperature All T

(See Thermal Considerations section)

Logic Pin Voltage (to SIG_GND or VO(-)) TRIM/C1, C2, ADDR0, ADDR1, CLK, DATA, SMBALERT

Storage Temperature All T I/O Isolation Voltage (100% factory Hi-Pot tested) All

All V

stg

 

* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

Parameter Device Symbol Min Typ Max Unit

Operating Input Voltage VIN 36 48 75 Vdc Maximum Input Current

(VIN=0V to 75V, IO=I Input No Load Current

(VIN = V

, IO = 0, module enabled)

IN, nom

Input Stand-by Current

(VIN = V

, module disabled)

IN, nom

)

O, max

All I

External Input Capacitance All 100 - - F

Inrush Transient All I2t - - 1 A2s

Input Terminal Ripple Current

(Measured at module input pin with maximum specified input capacitance and ൏ 500uH inductance between voltage source and input capacitance)

5Hz to 20MHz, VIN= 48V, IO= I

Omax

All - 350 - mA

Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 12H source impedance; V

; see Figure 10)

Omax

= 48V, IO=

All - 40 - mA

IN,max

IN,No load

IN,stand-by

-0.3 75 Vdc

80 100 Vdc

-40 85 °C

-0.3 3.6 Vdc

55 125 °C

2250 Vdc

- - 12 Adc

80 mA

22 mA

rms

p-p

Input Ripple Rejection (120Hz) All - 25 - dB

CAUTION: This power module is not internally fused. An input line fuse must always be used.

This power module can be used in a wide variety of applications, ranging from simple standalone operation to an integrated part of sophisticated power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-acting fuse with a maximum rating of 30 A (see Safety Considerations section). Based on the information provided in this Data Sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s Data Sheet for further information.



Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Electrical Specifications (continued)

Parameter Device Symbol Min Typ Max Unit

Output Voltage Set-point (V

IN=VIN,nom

(Adjustable via PMBus)

Output Voltage (Over all operating input voltage (40V to 75V), resistive load, and temperature conditions until end of life)

Output Voltage (VIN=36V, TA = 25ºC) All V

Output Regulation [V

Line (VIN= V Load (IO=I Load (IO=I Temperature (TA = -40ºC to +85ºC) All

Output Ripple and Noise on nominal output

(VIN=V

External Output Capacitance

For C

Output Current All I VOUT_OC_FAULT_LIMIT (Default)

(Adjustable via PMBus) Efficiency V

IN=VIN, nom

IO=100% I

IO=40% I

Switching Frequency f

Dynamic Load Response

dIO/dt=1A/10s; Vin=Vin, (Tested with a 1.0F ceramic, a 10F tantalum, and 470

Load Change from IO = 50% to 75% of I Peak Deviation Settling Time (V

Load Change from IO = 75% to 50% of I Peak Deviation Settling Time (V

, IO=12.5A, TA =25°C)

All V

All w/o -P

-P Option

= 40V]

IN, min

IN, nom

IN, min

to I

O, min

to I

O, min

and IO=I

to V

) All

IN, max

) All w/o -P

O, max

), Intentional Droop -P Option

O, max

O, min

to I

)

O, max

RMS (5Hz to 20MHz bandwidth) All

Peak-to-Peak (5Hz to 20MHz bandwidth) All

>5000uF, IO must be < 50% I

O, max

during T

rise

All C

All I

, TA=25°C

O, max, VO

to 100% I

O, max

= V

All  95.9 %

O,set

= V

O, max , VO

; TA=25°C;

nom

All  95.5 %

O,set

F capacitor and across the load.)

O,max

All

<10% peak deviation)

O,max

All

<10% peak deviation)

O, set

11.97 12.00 12.03 V

11.76

11.68

11.15

 



 

0.2

12.24 V

12.32 V

 

% V % V

0.40 Vdc

O, max

O,lim



 

200



 

10,000 F

0 25 Adc



30.25



150 kHz

 __

__ __

300 700

 __

% V

s

O, set

rms

pk-pk

General Specifications

Parameter Device Symbol Typ Unit

Calculated Reliability Based upon Telcordia SR-332 Issue 2: Method I, Case 3, (I

=80%I

, TA=40°C, Airflow = 200

O, max

LFM), 90% confidence

All MTBF

All FIT

3,598,391

277.9

Hours

109/Hours Weight – Open Frame 47.4 (1.67) g (oz.) Weight – with Base plate option 66.4 (2.34) g (oz.)

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Isolation Specifications

Parameter Symbol Min Typ Max Unit

Isolation Capacitance C Isolation Resistance R

iso

 10

Feature Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.

Parameter Device Symbol Min Typ Max Unit

Remote On/Off Signal Interface

(VIN=V Negative Logic: device code suffix “1”

Lo Positive Logic: No device code suffix required Logic LO = module Off, Logic HI = module On

Logic LO Specification

On/Off Thresholds:

Remote On/Off Current – Logic LO (Vin =100V) All I

Logic LO Voltage All V Logic HI Voltage – (Typ = Open Collector) All V Logic HI maximum allowable leakage current

(V Maximum voltage allowed on On/Off pin All V

TON_DELAY and TON_RISE (Adjustable via PMBus)

delay

application of Vin with Remote On/Off set to On (Enable with Vin); or operation of Remote On/Off from Off to On with Vin already applied for at least 150 milli-seconds (Enable with on/off). (I * Increased T

rise

C * Increased T

modules. Load Sharing Current Balance (difference in output current across all modules with outputs in parallel, no load to full load)

Remote Sense Range All V VOUT_COMMAND

(Adjustable via PMBus) VOUT_OV_FAULT_LIMIT (Adjustable via PMBus)

OT_FAULT_LIMIT (Adjustable via PMBus) All T Input Undervoltage Lockout (Adjustable via PMBus)

VIN_ON

VIN_OFF Input Overvoltage Lockout

(Adjustable via PMBus) Turn-off Threshold [VIN_OV_FAULT_LIMIT]

Turn-on Threshold (follows VIN_OV_FAULT_LIMIT -7V)

Pull down resistance of PGOOD pin Sink current capability into PGOOD pin (V

IN, min

to V

, Signal referenced to V

IN, max

ic LO = module On, Logic HI = module Off

= 2.0V)

on/off

=Time until VO = 10% of V

O=IO, max

due to startup for parallel modules.

delay

from either

O,set

)

=Time for VO to rise from 10% to 90% of V

>5000uF, IO must be < 50% I

when Vo exists at startup for parallel

rise

O, max

during T

terminal)

IN-

280

-0.3

2.0

  

   

 

O,set-

+2.5V



33 35 36 Vdc 31 33 34 Vdc



rise

=2.2V)

O,set

, For

All I

All w/o -P

All w/o-P

w/ -P T

w/ -P

All w/o -

w/ -P T

-P

Option

All V

All All

on/off

Enable with Vin

delay,

Tdelay, Enable with

on/off

Enable with Vin

delay,

delay, Enable with

on/off

rise

diff

Sense

8.1

O, set

O,limit

ref

1000

 

  



140



M

310 A

0.8 Vdc

14.5 Vdc

10 A

14.5 V

150 ms

10 ms

180* ms

40* ms

15 ms

300* ms

3 A

0.5 Vdc

13.2 Vdc

O,set-

+5.0V



150

°C



Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Digital Interface Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.

Parameter Conditions Symbol Min Typ Max Unit

PMBus Signal Interface Characteristics

Input High Voltage (CLK, DATA) VIH 2.1 3.6 V Input Low Voltage (CLK, DATA) VIL 0.8 V Input high level current (CLK, DATA) IIH -10 10 A Input low level current (CLK, DATA) IIL -10 10 A

Output Low Voltage (CLK, DATA, SMBALERT#) I

Output high level open drain leakage current (DATA, SMBALERT#)

Pin capacitance CO 0.7 pF

PMBus Operating frequency range (* 5-10 kHz to accommodate hosts not supporting clock stretching)

Measurement System Characteristics

Output current reading range Output current reading blanking I

Output current reading resolution

Output current reading accuracy 16.5A< Iout <25.0A I Output current reading accuracy (absolute

difference between actual and reported values) V

reading range V

OUT

reading resolution

OUT

reading accuracy

OUT

VIN reading range VIN reading resolution VIN reading accuracy Temperature reading resolution Temperature reading accuracy

=2mA VOL 0.4 V

OUT

=3.6V I

OUT

0 10 A

Slave Mode FPMB 5* 400 kHz

1.65A< Iout <16.5A

OUT(RNG)

OUT(BNK)

OUT(RES)

OUT(ACC)

OUT(RNG)

OUT(RES)

OUT(ACC)

IN(RNG)

IN(RES)

IN(ACC)

(RES)

(ACC)

1.6500 63.9375 A 0 1.5875 A

62.5 mA

-5.0 -1.4 3.0 %

-1.7 2.5 A

0 15.9997 V

0.244 mV

-2.0 0.6 2.0 %

0 127.875 V

125 mV

-4.0 0.8 4.0 %

0.25

-5.0 5.0 %

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Characteristic Curves

The following figures provide typical characteristics for the QBDW025A0B (12V, 25A) at 25ºC. The figures are identical for either positive or negative Remote On/Off logic.

(A)

INPUT CURRENT, I

INPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A)

EFFCIENCY,  (%)

Figure 1. Typical Input Characteristic. Figure 2. Typical Converter Efficiency vs. Output

Current.

(V) (200mV/div)

(V) (50mV/div)

OUTPUT VOLTAGE,

(A) (10A/div) V

TIME, t (2s/div)

Figure 3. Typical Output Ripple and Noise, Io = I

o,max

OUTPUT CURRENT OUTPUT VOLTAGE

Figure 4. Typical Transient Response to 0.1A/µs Step

TIME, t (500 s/div)

Change in Load from 50% to 75% to 50% of Full Load, Co=470µF and 48 Vdc Input.

(V) (20V/div)

(V) (5V/div) V

OUTPUT VOLTAGE INPUT VOLTAGE

TIME, t (20 ms/div) TIME, t (5 ms/div)

Figure 5. Typical Start-Up Using Vin with Remote On/Off enabled, negative logic version shown.

(V)(2V/div)

ON/OFF

(V) (5V/div) V

OUTPUT VOLTAGE On/Off VOLTAGE

Figure 6. Typical Start-Up Using Remote On/Off with Vin applied, negative logic version shown.

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Characteristic Curves (continued)

(V)

OUTPUT VOLTAGE, V

INPUT VOLTAGE, Vin (V) OUTPUT CURRENT, IO (A)

Figure 7. Typical Output Voltage Regulation vs. Input Voltage.

Figure 9. Typical Output Voltage Regulation vs. Input Voltage for the –P Version.

(V)

OUTPUT VOLTAGE, V

INPUT VOLTAGE, Vin (V) OUTPUT CURRENT, IO (A)

(V)

OUTPUT VOLTAGE, V

Figure 8. Typical Output Voltage Regulation vs. Output Current.

Figure 10. Typical Output Voltage Regulation vs. Output Current for the –P Version.

(V)

OUTPUT VOLTAGE, V

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Test Configurations

Note: Measure input reflected-ripple current with a simulated

source inductance (LTEST) of 12 µH. Capacitor CS offsets possible battery impedance. Measure current as shown above.

Figure 11. Input Reflected Ripple Current Test Setup.

Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tantalum capacitor. Scope measurement should be made using a BNC socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from the module.

Figure 12. Output Ripple and Noise Test Setup.

Note: All measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance.

Figure 13. Output Voltage and Efficiency Test Setup.

SUPPLY

CONTACT

RESISTANCE

CONTACT AND

DISTRIBUTION LOSSES

(+)

(–)

LOAD

Design Considerations

Input Source Impedance

The power module should be connected to a low ac-impedance source. A highly inductive source impedance can affect the stability of the power module. For the test configuration in Figure 10, a 100F electrolytic capacitor, C (ESR<0.7 at 100kHz), mounted close to the power module helps ensure the stability of the unit. If the module is subjected to rapid on/off cycles, a 330F input capacitor is required. Consult the factory for further application guidelines.

Safety Considerations

For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL60950-1 2 VDE0805-1 EN60950-1 2

Ed., CSA C22.2 No. 60950-1 2nd Ed., and

Ed.

If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to 75Vdc), for the module’s output to be considered as meeting the requirements for safety extra-low voltage (SELV), all of the following must be true:

 The input source is to be provided with reinforced

insulation from any other hazardous voltages, including the ac mains.

 One V

pin and one V

pin are to be grounded, or

OUT

both the input and output pins are to be kept floating.

 The input pins of the module are not operator

accessible.

 Another SELV reliability test is conducted on the whole

system (combination of supply source and subject module), as required by the safety agencies, to verify that under a single fault, hazardous voltages do not appear at the module’s output.

Note: Do not ground either of the input pins of the module

without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pins and ground.

The power module has safety extra-low voltage (SELV) outputs when all inputs are SELV.

The input to these units is to be provided with a maximum 30 A fast-acting (or time-delay) fuse in the unearthed lead.

The power module has internally generated voltages exceeding safety extra-low voltage. Consideration should be taken to restrict operator accessibility.

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Feature Descriptions

Overcurrent Protection

To provide protection in a fault output overload condition, the QBDW025A0B module is equipped with internal currentlimiting circuitry and can endure current limiting continuously. If the overcurrent condition causes the output voltage to fall below 4.0V, the module will shut down. The module is factory default configured for auto-restart operation. The auto-restart feature continually attempts to restore the operation until fault condition is cleared. If the output overload condition still exists when the module restarts, it will shut down again. This operation will continue indefinitely until the overcurrent condition is corrected. The IOUT_OC_WARN threshold level, IOUT_OC_FAULT threshold level, and IOUT_OC_FAULT_RESPONSE can be reconfigured via the PMBus interface. If the FAULT_RESPONSE is reconfigured to remain latched off following an overcurrent shutdown, the overcurrent latch is reset by either cycling the input power, or by toggling the on/off pin for one millisecond.

Output Overvoltage Protection

The module contains circuitry to detect and respond to output overvoltage conditions. If the overvoltage condition causes the output voltage to rise above the limit in the Specifications Table, the module will shut down. The QBDW025A0B module is factory default configured for autorestart operation. The auto-restart feature continually attempts to restore the operation until fault condition is cleared. If the output overvoltage condition still exists when the module restarts, it will shut down again. This operation will continue indefinitely until the overvoltage condition is corrected.

The VOUT_OV_FAULT threshold level and VOUT_OV_FAULT _RESPONSE can be reconfigured via the PMBus interface. If the FAULT _RESPONSE is reconfigured to remain latched off following an overvoltage shutdown, the overvoltage latch is reset by either cycling the input power, or by toggling the on/off pin for one millisecond.

Overtemperature Protection

The modules feature an overtemperature protection circuit to safeguard against thermal damage. The circuit shuts down the module when the default maximum device reference temperature is exceeded. The module is factory default configured to automatically restart once the reference temperature cools by ~25°C.

The OT_WARNING and OT_FAULT threshold levels and OT_FAULT_RESPONSE can be reconfigured via the PMBus interface. If the FAULT _RESPONSE is reconfigured to remain latched off following an overtemperature shutdown, the overtemperature latch is reset by either cycling the input power or by toggling the on/off pin for one millisecond.

Input Under Voltage Lockout

When Vin exceeds VIN_ON, the module output is enabled, when Vin falls below VIN_OFF, the module output is disabled. VIN_ON and VIN_OFF can be reconfigured via the PMBus interface. A minimum 2V hysteresis between VIN_ON and VIN_OFF is required.

Input Over Voltage Lockout

The QBDW025A0B module contains circuitry to detect and respond to input overvoltage conditions. If the overvoltage condition causes the input voltage to rise above the limit in the Specifications Table, the module will shut down. The module is factory default configured for auto-restart operation. The auto-restart feature continually monitors the input voltage and will restart the module when the level falls 7V below the VIN_OV_FAULT level.

The VIN_OV_FAULT threshold level can be reconfigured via the PMBus interface.

Remote On/Off (i)

The module contains a standard on/off control circuit reference to the V remote on/off logic options are available. Positive logic remote on/off turns the module on during a logic HI voltage on the ON/OFF pin, and off during a logic LO. Negative logic remote on/off turns the module off during a logic HI, and on during a logic LO. Negative logic, device code suffix "1," is the factory-preferred configuration. The On/Off circuit is powered from an internal bias supply, derived from the input voltage terminals. To turn the power module on and off, the user must supply a switch to control the voltage between the On/Off terminal and the V The switch can be an open collector or equivalent (see Figure 14). A logic LO is V

during a logic LO (Vin=48V, On/Off Terminal=0.3V) is

on/off

147µA. The switch should maintain a logic LO voltage while sinking 310µA. During a logic HI, the maximum V generated by the power module is 8.2V. The maximum allowable leakage current of the switch at V 10µA. If using an external voltage source, the maximum voltage V terminal.

If not using the remote on/off feature, perform one of the following to turn the unit on:

For negative logic, short ON/OFF pin to V For positive logic: leave ON/OFF pin open.

Figure 14. Remote On/Off Implementation.

on/off

(-) terminal. Two factory configured

(-) terminal (V

= -0.3V to 0.8V. The typical

on/off

on the pin is 14.5V with respect to the VIN(-)

(-).

on/off

= 2.0V is

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Feature Descriptions (continued)

Load Sharing

For higher power requirements, the QBDW025A0 power module offers an optional feature for parallel operation (-P Option code). This feature provides a precise forced output voltage load regulation droop characteristic. The output set point and droop slope are factory calibrated to insure optimum matching of multiple modules’ load regulation characteristics. To implement load sharing, the following requirements should be followed:

 The V

 V

 It is permissible to use a common Remote On/Off signal to

 These modules contain means to block reverse current

 When parallel modules startup into a pre-biased output,

 Insure that the load is <50% I

 If fault tolerance is desired in parallel applications, output

(+) and V

OUT

connected together. Balance the trace resistance for each module’s path to the output power planes, to insure best load sharing and operating temperature balance.

must remain between 40Vdc and 75Vdc for droop

sharing to be functional.

start all modules in parallel.

flow upon start-up, when output voltage is present from other parallel modules, thus eliminating the requirement for external output ORing devices. Modules with the –P option will self determine the presence of voltage on the output from other operating modules, and automatically increase its Turn On delay, T Specifications Table.

e.g. partially discharged output capacitance, the T automatically increased, as specified in the Feature Specifications Table, to insure graceful startup.

all parallel modules have started (load full start > module

time max + T

delay

ORing devices should be used to prevent a single module failure from collapsing the load bus.

(-) pins of all parallel modules must be

OUT

, as specified in the Feature

delay

rise

(for a single module) until

O,MAX

time).

rise

Remote Sense

Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections (See Figure 15). The SENSE(-) pin should be always connected to

(–).The voltage between the remote-sense pins and the

output terminals must not exceed the output voltage sense range given in the Feature Specifications table:

(+) – VO(–)] – [SENSE(+) ]  0.5 V

Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current, would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = Vo,set x Io,max).

Figure 15. Circuit Configuration for remote sense.

Configurable Control Pins

The QBDW025A0B contains two configurable control pins, T/C1 and C2, referenced to the module secondary SIG_GND. See Mechanical Views for pin locations. The following table list the default factory configurations for the functions assigned to these pins. Additional configurations can be accomplished via the PMBus command, MFR_CPIN_ARA_CONFIG. Following the table, there is a feature description for each function.

Designation/Function

T/C1

On/Off (O) Power Good w/o -P Factory Default

Trim On/Off (O) w/o -P Via PMBus Trim

On/Off (O) Power Good with -P Factory Default

Power Good w/o -P Via PMBus

Module

Code

Configuration

Remote On/Off(o)

The module contains an additional remote on/off control input On/Off(o), via either the T/C1 or C2 pin, reference to the

(-) terminal. The factory default configuration is set to

ignore this input, unless activated by the PMBus command, MFR_ CPIN_ON_OFF_CONFIG. This command is also used to configure the logic for the On/Off(o) pin. Positive logic remote on/off turns the module on during a logic HI voltage on the ON/OFF pin, and off during a logic LO. Negative logic remote on/off turns the module off during a logic HI, and on during a logic LO. The On/Off(o) circuit is powered from an internal bias supply, referenced to SIG_GND. To turn the power module on and off, the user must supply a switch to control the voltage between the On/Off (o) terminal and the

(-) terminal (V

or equivalent (see Figure 13). A logic LO is V

0.8V. The typical I switch should maintain a logic LO voltage while sinking TBDµA. During a logic HI, the maximum V by the power module is TBDV. The maximum allowable leakage current of the switch at V using an external voltage source, the maximum voltage

on the pin is 3.3V with respect to the Vi(-) terminal.

on/off

If not using the Remote On/Off(o) feature, the pin may be left N/C.

(o)). The switch can be an open collector

on/off

(o) during a logic LO is 330µA. The

on/off

(o) = 2.0V is 130µA. If

on/off

(o) = -0.3V to

on/off

(o) generated

on/off

Feature Descriptions (continued)

Power Good, PG

The QBDW025A0B module provides a Power Good (PG) feature, which compares the module’s output voltage to the module’s POWER_GOOD_ON and POWER_GOOD_OFF



Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

values. These values are adjustable via PMBus. PG is asserted when the module’s output voltage is above the POWER_GOOD_ON value, and PG is de-asserted if any condition such as overtemperature, overcurrent or loss of regulation occurs that would result in the output voltage going below the POWER_GOOD_OFF value.

The PG signal, provided on pin C2, is implemented with an open-drain node, pulled up via a 10k resistor to 3.3V internally. For Positive Logic PG (default), the PG signal is HI, when PG is asserted, and LO, when the PG is de-asserted. For Negative Logic PG, the PG signal is LO, when PG is asserted, and HI, when the PG is de-asserted.

The PMBus command MFR_PGOOD _POLARITY is used to set the logic polarity of the signal.

If not using the Power Good feature, the pin may be left N/C.

Trim, Output Voltage Programming

Trimming allows the output voltage set point to be increased or decreased; this is accomplished by connecting an external resistor between the TRIM pin and either the

(+) pin or the VO(-) pin.

VO(+)

trim-up

LOAD

T/C1

QBDW033A0B

VO(-)

tri m-d own

Figure 16. Circuit Configuration to Trim Output Voltage.

Connecting an external resistor (R

) between the T/C1

trim-down

pin and the Vo(-) (or Sense(-)) pin decreases the output voltage set point. To maintain set point accuracy, the trim resistor tolerance should be ±1.0%.

The following equation determines the required external resistor value to obtain a percentage output voltage change of %.

511

Where





% 



 





downtrim







0.12





desired



0.12







100



22.10

 

For example, to trim-down the output voltage of the module by 20% to 9.6V, Rtrim-down is calculated as follows:

20% 

511





downtrim





Connecting an external resistor (R pin and the V

(+) (or Sense (+)) pin increases the output







22.10

 

kR

downtrim

3.15

) between the T/C1

trim-up

voltage set point. The following equations determine the

required external resistor value to obtain a percentage output voltage change of %:



511

Where







uptrim

 





desired

% 



 

0.12

%)100(0.1211.5 V



%225.1

0.12



100

 





For example, to trim-up the output voltage of the module by 5% to 12.6V, R



uptrim

is calculated is as follows:

trim-up





 



uptrim

5% 



511

)5100(0.1211.5



5225.1

8.938

The voltage between the Vo(+) and Vo(–) terminals must not exceed the minimum output overvoltage protection value shown in the Feature Specifications table. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment trim. Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = V

O,max

22.10

 



O,set

 





Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Feature Descriptions (continued)

Thermal Considerations

The thermal data presented here is based on physical measurements taken in a wind tunnel, using automated thermo-couple instrumentation to monitor key component temperatures: FETs, diodes, control ICs, magnetic cores, ceramic capacitors, opto-isolators, and module pwb conductors, while controlling the ambient airflow rate and temperature. For a given airflow and ambient temperature, the module output power is increased, until one (or more) of the components reaches its maximum derated operating temperature, as defined in IPC-9592B. This procedure is then repeated for a different airflow or ambient temperature until a family of module output derating curves is obtained.

Figure 17. Location of the thermal reference temperature TH.

The power modules operate in a variety of thermal environments and sufficient cooling should be provided to help ensure reliable operation. Thermal considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability.

Heat-dissipating components are mounted on the top side of the module. Heat is removed by conduction, convection and radiation to the surrounding environment. Proper cooling can be verified by measuring the thermal reference temperature (TH1 or TH2). Peak temperature occurs at the position indicated in Figure 17 and 18. For reliable operation this temperature should not exceed TH TH

=105°C. For extremely high reliability you can limit this

temperature to a lower value.

=125°C or

Figure 18. Location of the thermal reference temperature TH

for Baseplate module.

The output power of the module should not exceed the rated power for the module as listed in the Ordering Information table.

Please refer to the Application Note “Thermal Characterization Process For Open-Frame Board-Mounted Power Modules” for a detailed discussion of thermal aspects including maximum device temperatures.

Heat Transfer via Convection

Increased airflow over the module enhances the heat transfer via convection. The thermal derating of figure 1923 shows the maximum output current that can be delivered by each module in the indicated orientation without exceeding the maximum TH local ambient temperature (T conditions.

The use of Figure 19 is shown in the following example:

Example

What is the minimum airflow necessary for a QBDW025A0B operating at V maximum ambient temperature of 60 °C in transverse orientation.

Solution: Given: V Determine required airflow velocity (Use Figure 19): Velocity = 0.5m/s (100 LFM) or greater.

= 48 V, an output current of 20A, and a

= 48V, IO = 20A, TA = 60 °C

temperature versus

) for several air flow

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Thermal Considerations (continued)

(A)

OUTPUT CURRENT, I

Figure 19. Output Current Derating for the Open Frame QBVW025A0B in the Transverse Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V.

(A)

OUTPUT CURRENT, I

Figure 20. Output Current Derating for the Base plate QBVW025A0B-H in the Transverse Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V.

LOCAL AMBIENT TEMPERATURE, TA (C)

OUTPUT CURRENT, I

Figure 22. Output Current Derating for the Base plate QBVW025A0B-H with 0.5” heatsink in the Transverse Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V

(A)

OUTPUT CURRENT, I

Figure 23. Output Current Derating for the Base plate QBVW025A0B-H with 1.0” heatsink in the Transverse Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V.

LOCAL AMBIENT TEMPERATURE, TA (C)

(A)

OUTPUT CURRENT, I

Figure 21. Output Current Derating for the Base plate QBVW025A0B-H with 0.25” heatsink in the Transverse Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V

LOCAL AMBIENT TEMPERATURE, T

(C)

(A)

OUTPUT CURRENT, I

COLD WALL TEMPERATURE, TC (C)

Figure 24. Output Current Derating for the Base Plate QBVW025A0B-H in a Cold wall application; Local Internal Air Temperature near module=80C, V anywhere from 6.0V to 12.0V.

= 48V, V

setting

OUT

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Layout Considerations

The QBDW025 power module series are low profile in order to be used in fine pitch system card architectures. As such, component clearance between the bottom of the power module and the mounting board is limited. Avoid placing copper areas on the outer layer directly underneath the power module. Also avoid placing via interconnects underneath the power module.

For additional layout guide-lines, refer to FLTR100V10 Data Sheet.

Through-Hole Lead-Free Soldering Information

The RoHS-compliant, Z version, through-hole products use the SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant components. The non-Z version products use lead-tin (Pb/Sn) solder and RoHS-compliant components. Both version modules are designed to be processed through single or dual wave soldering machines. The pins have an RoHS-compliant, pure tin finish that is compatible with both Pb and Pb-free wave soldering processes. A maximum preheat rate of 3C/s is suggested. The wave preheat process should be such that the temperature of the power module board is kept below 210C. For Pb solder, the recommended pot temperature is 260C, while the Pb-free solder pot is 270C max. Not all RoHS-compliant throughhole products can be processed with paste-through-hole Pb or Pb-free reflow process. If additional information is needed, please consult with your GE representative for more details.

Reflow Lead-Free Soldering Information

The RoHS-compliant through-hole products can be processed with the following paste-through-hole Pb or Pbfree reflow process.

Max. sustain temperature : 245C (J-STD-020C Table 4-2: Packaging Thickness>=2.5 / Volume > 2000

Peak temperature over 245C is not suggested due to the potential reliability risk of components under continuous high-temperature. Min. sustain duration above 217C : 90 seconds Min. sustain duration above 180C : 150 seconds Max. heat up rate: 3C/sec Max. cool down rate: 4C/sec In compliance with JEDEC J-STD-020C spec for 2 times reflow requirement.

Pb-free Reflow Profile

BMP module will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures. BMP will comply with JEDEC J-STD-020C specification for 3 times reflow requirement. The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended

linear reflow profile using Sn/Ag/Cu solder is shown in Figure

24.

Figure 24. Recommended linear reflow profile using Sn/Ag/Cu solder.

MSL Rating

The QBDW025A0B modules have a MSL rating of 2a.

Storage and Handling

The recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices). Moisture barrier bags (MBB) with desiccant are required for MSL ratings of 2 or greater. These sealed packages should not be broken until time of use. Once the original package is broken, the floor life of the product at conditions of 30°C and 60% relative humidity varies according to the MSL rating (see J-STD-025A). The shelf life for dry packed SMT packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions: < 40° C, < 90% relative humidity.

Post Solder Cleaning and Drying Considerations

Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to GE Board Mounted Power Modules: Soldering and Cleaning Application Note (AP01-056EPS).

EMC Considerations

The circuit and plots in Figure 25 shows a suggested configuration to meet the conducted emission limits of EN55022 Class A. For further information on designing for EMC compliance, please refer to the FLTR100V10 data sheet.

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Figure 25. EMC Considerations

Packaging Details

All versions of the QBDW025A0B are supplied as standard in the plastic trays shown in Figure 26. Each tray contains a total

of 12 power modules. The trays are self-stacking and each shipping box for the QBDW025A0B module contains 2 full trays plus one empty hold-down tray giving a total number of 24 power modules.

Tray Specification

Material PET (1mm) Max surface resistivity Color Clear Capacity 12 power modules Min order quantity 24 pcs (1 box of 2 full trays + 1 empty top tray)

109 -1011/PET

Open Frame Module Tray Base Plate Module Tray

Figure 26. QBDW025 Packaging Tray

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Digital Feature Descriptions

PMBus Interface Capability

The QBDW025A0B series is equipped with a digital PMBus interface to allow the module to be configured, and communicate with system controllers. Detailed timing and electrical characteristics of the PMBus can be found in the PMB Power Management Protocol Specification, Part 1, revision 1.2, available at http://pmbus.org. The QBDW025A0B supports both the 100kHz and 400kHz bus timing requirements. The QBDW025A0B shall stretch the clock, as long as it does not exceed the maximum clock LO period of 35ms. The QBDW025A0B will check the Packet Error Checking scheme (PEC) byte, if provided by the PMBus master, and include a PEC byte in all responses to the master. However, the QBDW025A0B does not require a PEC byte from the PMBus master.

The QBDW025A0B supports a subset of the commands in the PMBus 1.2 specification. Most all of the controller parameters can be programmed using the PMBus and stored as defaults for later use. All commands that require data input or output use the linear format. The exponent of the data words is fixed at a reasonable value for the command and altering the exponent is not supported. Direct format data input or output is not supported by the QBDW025A0B. The supported commands are described in greater detail below.

The QBDW025A0B contains non-volatile memory that is used to store configuration settings and scale factors. The settings programmed into the device are not automatically saved into this non-volatile memory though. The STORE_DEFAULT_ALL command must be used to commit the current settings to non-volatile memory as device defaults. The settings that are capable of being stored in non-volatile memory are noted in their detailed descriptions.

SMBALERT Interface Capability

The QBDW025A0B also supports the SMBALERT response protocol. The SMBALERT response protocol is a mechanism through which the QBDW025A0B can alert the PMBus master that it has an active status or alarm condition via pulling the SMBALERT pin to an active low. The master processes this condition, and simultaneously addresses all slaves on the PMBus through the Alert Response Address. Only the slave(s) that caused the alert (and that support the protocol) acknowledges this request. The master performs a modified receive byte operation to get the slave’s address. At this point, the master can use the PMBus status commands to query the slave that caused the alert. Note: The QBDW025A0B can only respond to a single address at any given time. Therefore, the factory default state for the QBDW025A0B module is to retain it’s resistor programmed address, when it is in an ALERT active condition, and not respond to the ARA. This allows master systems, which do not support ARA, to continue to communicate with the slave QBDW025A0B using the programmed address, and using the various READ_STATUS commands to determine the cause for the SMBALERT. The CLEAR_FAULTS command will retire the active SMBALERT. However, when the QBDW025A0B module is used in systems that do support ARA, Bit 4 of the MFR_CPIN_ARA_CONFIG command can be used to

reconfigure the module to utilize ARA. In this case, the QBDW025A0B will no longer respond to its programmed address, when in an ALERT active state. The master is expected to perform the modified received byte operation, and retire the ALERT active signal. At this time, the QBDW025A0B will return to it’s resistor programmed address, allowing normal master-slave communications to proceed. The QBDW025A0B does not contain capability to arbitrate data bus contention caused by multiple modules responding to the modified received byte operation. Therefore, when the ARA is used in a multiple module PMBus application, it is necessary to have the QBDW025A0B module at the lowest programmed address in order for the host to properly determine all modules’ address that are associated with an active SMBAlert. Please contact your GE sales representative for further assistance, and for more information on the SMBus alert response protocol, see the System Management Bus (SMBus) specification.

PMBus Addressing

The power module can be addressed through the PMBus using a device address. The module has 64 possible addresses (0 to 63 in decimal) which can be set using resistors connected from the ADDR0 and ADDR1 pins to GND. Note that some of these addresses (0 through 12, 40, 44, 45, and 55 in decimal) are reserved according to the SMBus specifications and may not be useable. The address is set in the form of two octal (0 to 7) digits, with each pin setting one digit. The ADDR1 pin sets the high order digit and ADDR0 sets the low order digit. The resistor values suggested for each digit are shown in Table 4 (1% tolerance resistors are recommended).

Table 4

Digit

0 10 1 15.4 2 23.7 3 36.5 4 54.9 5 84.5 6 130 7 200

Figure 27. Circuit showing connection of resistors used to set the PMBus address of the module.

The user must know which I system for special functions and set the address of the module to avoid interfering with other system operations. Both 100kHz and 400kHz bus speeds are supported by the module. Connection for the PMBus interface should follow the

Resistor Value (KΩ)

ADDR1

ADDR0

SIG_GND

C addresses are reserved in a

ADDR0

ADDR1

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

High Power DC specifications given in section 3.1.3 in the SMBus specification V2.0 for the 400kHz bus speed or the Low Power DC specifications in section 3.1.2. The complete SMBus specification is available from the SMBus web site, smbus.org.

PMBus Data Format

For commands that set or report any voltage thresholds related to output voltage (including VOUT_COMMAND, VOUT_MARGIN, POWER_GOOD and READ_VOUT), the module supports the linear data format consisting of a two byte value with a 16-bit, unsigned mantissa, and a fixed exponent of -12. The format of the two data bytes is shown below:

The value of the number is then given by

Value = Mantissa x 2

For commands that set all other thresholds, voltages or report such quantities, the module supports the linear data format consisting of a two byte value with an 11-bit, two’s complement mantissa and a 5-bit, two’s complement exponent. The format of the two data bytes is shown below:

The value is of the number is then given by

Value = Mantissa x 2

-12

Exponent

PMBus Enabled On/Off

The module can also be turned on and off via the PMBus interface. The OPERATION command is used to actually turn the module on and off via the PMBus, while the ON_OFF_CONFIG command configures the combination of analog ON/OFF pin input and PMBus commands needed to turn the module on and off. Bit [7] in the OPERATION command data byte enables the module, with the following functions:

0 : Output is disabled 1 : Output is enabled

This module uses the lower five bits of the ON_OFF_CONFIG data byte to set various ON/OFF options as follows:

Bit Position 4 3 2 1 0

Access r r/w r/w r r

Function PU CMD CPR POL CPA

Default Value 1 1 1 1 1

PU: Factory set to 1. QBDW025A0B requires On/Off (I) pin to be connected to proper input rail for module to power up. This bit is used together with the CP, CMD and ON bits to determine startup.

Bit Value

Module does not power up until commanded by the analog ON/OFF pin

and the OPERATION command as programmed in bits [2:0] of the

CMD: The CMD bit controls how the device responds to the OPERATION command.

Bit Value

CPR: Sets Factory set to 1. QBDW025A0B requires On/Off (I) pin to be connected to proper input rail for module to power up. This bit is used together with the CMD, PU and ON bits to determine startup.

Bit Value

ON_OFF_CONFIG register.

Module ignores the ON bit in the

OPERATION command

Module responds to the ON bit in the

OPERATION command

Module requires the analog ON/OFF pin to

be asserted to start the unit

Action

PMBus Adjustable Input Undervoltage Lockout

The module allows adjustment of the input under voltage lockout and hysteresis. The command VIN_ON allows setting the input voltage turn on threshold, while the VIN_OFF command sets the input voltage turn off threshold. For both the VIN_ON and VIN_OFF commands, possible values range from 32.000 to 46.000V in 0.125V steps. VIN_ON must be

2.000V greater than VIN_OFF.

Both the VIN_ON and VIN_OFF commands use the “Linear” format with two data bytes. The upper five bits [7:3] of the high data byte form the two’s complement representation of the exponent, which is fixed at –3 (decimal). The remaining 11 bits are used for two’s complement representation of the mantissa, with the 11 numbers are valid. The data associated with VIN_ON and VIN_OFF can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

bit fixed at zero since only positive

PMBus Adjustable Soft Start Delay and Rise Time

The soft start delay and rise time can be adjusted in the module via PMBus. The TON_DELAY command sets the delay time in ms, and allows choosing delay times between 10ms and 500ms, with resolution of 0.5ms. The TON_RISE command sets the rise time in ms, and allows choosing soft start times between 15ms and 500ms, with resolution of

0.5ms. When setting TON_RISE, make sure that the charging current for output capacitors can be delivered by the module in addition to any load current to avoid nuisance tripping of the overcurrent protection circuitry during startup. Both the TON_RISE and TON_DELAY commands use the “Linear” format with two data bytes. The upper five bits [7:3] of the



Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

high data byte form the two’s complement representation of the exponent, which is fixed at –1 (decimal). The remaining 11 bits are used for two’s complement representation of the mantissa, with the 11 numbers are valid. The data associated with TON_RISE and TON_DELAY can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

bit fixed at zero since only positive

Output Voltage Adjustment Using the PMBus

The QBDW033A0B module output voltage set point is adjusted using the VOUT_COMMAND. The output voltage setting uses the Linear data format, with the 16 bits of the VOUT_COMMAND formatted as an unsigned mantissa, and a fixed exponent of -12 (decimal) (read from VOUT_MODE).

= Mantissa x 2

OUT

The range limits for VOUT_COMMAND are 8.10V to 13.20V, and the resolution is 0.244mV. The data associated with VOUT_COMMAND can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

-12

Output Voltage Margining Using the PMBus

The QBDW033A0B module can also have its output voltage margined via PMBus commands. The command VOUT_MARGIN_HIGH sets the margin high voltage, while the command VOUT_MARGIN_LOW sets the margin low voltage. Both the VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW commands use the “Linear” mode with the exponent fixed at –12 (decimal). The data associated with VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

The module is commanded to go to the margined high or low voltages using the OPERATION command. Bits [5:2] are used to enable margining as follows:

00XX : Margin Off 0110 : Margin Low (Act on Fault) 1010 : Margin High (Act on Fault)

Measuring Output Voltage Using the PMBus

The module can provide output voltage information using the READ_VOUT command. The command returns two bytes of data in the linear format, with the 16 bits of the READ_VOUT formatted as an unsigned mantissa, and a fixed exponent of

-12 (decimal).

During module manufacture, an offset correction value is written into the non-volatile memory of the module to null errors in the tolerance and A/D conversion of V command MFR_VOUT_READ_CAL_OFFSET can be used to read the offset - two bytes consisting of a signed 16-bit mantissa in two’s complement format, using a fixed exponent of -12 (decimal). The resolution is 0.244mV. The corrected Output voltage reading is then given by:

DAVadV

OUTOUT

)/([)(Re 

OFFSE

CALREADVOUTMFR

____

Measuring Input Voltage Using the PMBus

OUT

. The

The module can provide input voltage information using the READ_VIN command. The command returns two bytes of data in the linear format. The upper five bits [7:3] of the high data byte form the two’s complement representation of the exponent, which is fixed at –3 (decimal). The remaining 11 bits are used for two’s complement representation of the mantissa, with the 11 numbers are valid.

During module manufacture, offset and gain correction values are written into the non-volatile memory of the module to null errors in the tolerance and A/D conversion of Vin. The command MFR_VIN_READ_CAL_OFFSET can be used to read the offset - two bytes consisting of a five-bit exponent (fixed at -3) and a 11-bit mantissa in two’s complement format. The resolution is 125mV. The command MFR_VIN_READ_CAL_GAIN can be used to read the gain correction - two bytes consisting of a unsigned 16 bit number. The resolution of this correction factor 0.000122. The corrected input voltage reading is then given by:

adV

)(Re





bit fixed at zero since only positive

GAINCALREADVINMFRDAV

OFFSETCALREADVINMFR

____

Measuring Output Current Using the PMBus

The module measures output current by using the output filter inductor winding resistance as a current sense element. The module can provide output current information using the READ_IOUT command. The command returns two bytes of data in the linear format. The upper five bits [7:3] of the high data byte form the two’s complement representation of the exponent, which is fixed at –4 (decimal). The remaining 11 bits are used for two’s complement representation of the mantissa, with the 11 numbers are valid. Output current readings are blanked below 1.65A.

During module manufacture, offset and gain correction values are written into the non-volatile memory of the module to null errors in the tolerance and A/D conversion of

. The command MFR_IOUT_CAL_OFFSET can be used to

OUT

read the offset - two bytes consisting of a five-bit exponent (fixed at -4) and a 11-bit mantissa in two’s complement format. The resolution is 62.5mA. The command MFR_IOUT_CAL_GAIN can be used to read the gain correction

- two bytes consisting of a unsigned 16 bit number. The resolution of this correction factor 0.000122. The READ_IOUT command provides module average output current information. This command only supports positive current sourced from the module. If the converter is sinking current a reading of 0 is provided.

adI

OUT



Note that the current reading provided by the module is corrected for temperature.

bit fixed at zero since only positive

)(Re



OFFSETCALIOUTMFR

___

GAINCALIOUTMFRDAI

Measuring the Temperature using the PMBus

)]8192/____()/([

)]8192/___()/([

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

The module can provide temperature information using the READ_TEMPERATURE_1 command. The command returns two bytes of data in the linear format. The upper five bits [7:3] of the high data byte form the two’s complement representation of the exponent, which is fixed at –2 (decimal). The remaining 11 bits are used for two’s complement representation of the mantissa.

Note that the module’s temperature sensor is located close to the module hot spot TH is subjected to temperatures higher than the ambient air temperature near the module. The temperature reading will be highly influenced by module load and airflow conditions.

(see Thermal Considerations).and

Reading the Status of the Module using the PMBus

The module supports a number of status information commands implemented in PMBus. However, not all features are supported in these commands. A X in the FLAG cell indicates the bit is not supported.

STATUS_WORD : Returns two bytes of information with a summary of the module’s fault/warning conditions.

High Byte

Bit Position Flag Default Value

15 VOUT fault 0 14 IOUT fault or warning 0 13 Input Voltage fault 0 12 X 0 11 POWER_GOOD# (is negated) 0 10 X 0

9 X 0 8 X 0

Low Byte

Bit Position Flag Default Value

7 X 0 6 OFF 0 5 VOUT Overvoltage 0 4 IOUT Overcurrent 0 3 VIN Undervoltage 0 2 Temperature 0 1 CML (Comm. Memory Fault) 0 0 X 0

STATUS_VOUT : Returns one byte of information relating to the status of the module’s output voltage related faults.

Bit Position Flag Default Value

7 VOUT OV Fault 0 6 X 0 5 X 0 4 X 0 3 X 0 2 X 0 1 X 0 0 X 0

STATUS_IOUT : Returns one byte of information relating to the status of the module’s output currentrelated faults.

Bit Position

7 6 X 0 5 IOUT OC Warning 0 4 X 0 3 X 0 2 X 0 1 X 0 0 X 0

STATUS_INPUT : Returns one byte of information relating to the status of the module’s input voltage related faults.

Bit Position

7 VIN OV Fault 0 6 X 0 5 X 0 4 3 Module Off (Low VIN) 0 2 X 0 1 X 0 0 X 0

Flag Default Value

IOUT OC Fault 0

Flag Default Value

VIN UV Fault 0

STATUS_TEMPERATURE : Returns one byte of information relating to the status of the module’s temperature related faults.

Bit Position

7 OT Fault 0 6 OT Warning 0 5 X 0 4 X 0 3 X 0 2 X 0 1 X 0 0 X 0

Flag Default Value

STATUS_CML : Returns one byte of information relating to the status of the module’s communication related faults.

Bit Position

6 Invalid/Unsupported Data 0 5 4 X 0 3 X 0 2 X 0 1 X 0 0 X 0

Packet Error Check Failed 0

Flag Default Value

Invalid/Unsupported

Command

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Summary of Supported PMBus Commands

This document outlines the PMBus command support for the QBDW025 bus converter. Each supported command is outlined in order of increasing command codes with a quick reference table of all supported commands included at the end of the document.

Each command will have the following basic information.

Command Name [Code]

Command support Data format Factory default Additional information may be provided in tabular form or other format, if necessary.

OPERATION [0x01]

Command support: Supporting On/Off Immediate and Margins (Act on Fault). Soft off with sequencing not supported and Margins (Ignore Fault) not supported. Therefore bits 6, 3, 2, 1 and 0 set as read only at factory defaults.

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r/w r r/w r/w r r r r Function ON/OFF Bits[5:4] Bits[3:2] N/A Default Value 1 0 0 0 1 0 0 0

ON_OFF_CONFIG [0x02]

Command support: Bit 1 polarity will be set based upon module code [0=Negative on/off logic, 1=positive on/off logic to allow customer system to know hardware on/off logic

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r r r/w r/w r r Function (reserved) Bit 4 pu

Default Value 0 0 0 1 1 1

Bit 3 cmd Bit 2 cpr

Bit 1 pol Bit 0 cpa module

code

CLEAR_FAULTS [0x03]

Command support: All functionality

STORE_DEFAULT_ALL[0x11]

Command support: All functionality – Stores operating parameters to EEprom memory. Command requires  500ms to execute. Delay any additional commands to module for sufficient time to complete execution.

RESTORE_DEFAULT_ALL[0x12]

Command support: All functionality – Restores operating parameters from EEprom memory. Command requires  200ms to execute. Delay any additional commands to module for sufficient time to complete execution.

VOUT_MODE[0x20]

Command support: Supported. Factory default: 0x14 – indicates linear mode with exp = -12

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r Function Mode (linear) 2’s complement exponent Default Value 0 0 0 1 0 1 0 0

VOUT_COMMAND [0x21]

Data format: 16 bit unsigned mantissa (implied exponent per VOUT_MODE) Factory default: 12.00V ( 12.00 / 2 Range limits (max/min): 13.2V/8.10V Units: volt Command support: Supported

-12

→ 49,152 = 0xC000 )

VOUT_CAL_OFFSET [0x23]

Range limits (max/min): +0.25/-0.25 Units: volt Command support: read/write support, lockout per MFR_DEVICE_TYPE, functionality implemented

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

VOUT_MARGIN_HIGH [0x25]

Range limits (max/min): 13.2/8.1 Units: volt Command support: read/write support, full functionality except “Ignore faults”. Note: Range cross-check - value must be greater than VOUT_MARGIN_LOW value.

VOUT_MARGIN_LOW [0x26]

Range limits (max/min): 13.2/8.1 Units: volt Command support: read/write support, full functionality except “Ignore faults”. Note: Range cross-check - value must be less than VOUT_MARGIN_HIGH value.

VOUT_DROOP [0x28]

Factory default: 0 (No droop); 15 (Parallel operation) Range limits (max/min): 50/0 Units: mv/A Command support: All functionality

VIN_ON [0x35]

Range limits (max/min): 46/32 Units: volt Command support: All functionality Note: Special interlock checks between VIN_ON and VIN_OFF maintain a hysteresis gap of 2V minimum and do not allow the OFF level to be higher than and ON level

VIN_OFF [0x36]

VOUT_OV_FAULT_LIMIT [0x40]

Range limits (max/min): 15.99/10.9 (See note 2) Units: volt Command support: All functionality Note:

1. Range cross- check – value must be greater than VOUT_COMMAND value.

2. The maximum OV Fault Limit equals the output set point plus 3V, up to 15.99V. This is an automatic module protection feature that will override a user-set fault limit if the user limit is set too high.

VOUT_OV_FAULT_RESPONSE [0x41]

Command support:

‐ Response settings (bits RSP0:1) – only a setting of 10, unit shuts down and responds according to the retry settings

below, is supported.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault) and 111 unit continuously

restarts (normal startup) while fault is present until commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the VOUT_OV_FAULT_RESPONSE command are;

‐ The unit shuts down in response to a VOUT over voltage condition. ‐ The unit will continuously restart (normal startup) while the VOUT over voltage condition is present until it is

commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r/w r/w r/w r r r Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0] Default Value 1 0 1 1 1 0 0 0

1 1 0

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

IOUT_OC_FAULT_LIMIT [0x46]

Range limits (max/min): 45.5/15.25 Units: amp Command support: All functionality Note: Range cross-check – value must be greater than IOUT_OC_WARN_LIMIT value.

IOUT_OC_FAULT_RESPONSE [0x47]

Command support:

‐ Response settings (bits RSP0:1) – only settings of 11, unit shuts down and responds according to the retry settings

below, is supported.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault) and 111 unit continuously

restarts (normal startup) while fault is present until commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the IOUT_OC_FAULT_RESPONSE command are;

‐ The unit shuts down in response to an IOUT over current condition. ‐ The unit will continuously restart (normal startup) while the IOUT over current condition is present until it is

commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r/w r/w r/w r r r Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0] Default Value 1 1 1

0 0

IOUT_OC_WARN_LIMIT [0x4A]

Range limits (max/min): 30.3/7.6 Units: amp Command support: read/write support, functionality complete Note: Range cross-check – value must be less than IOUT_OC_FAULT_LIMIT value.

OT_FAULT_LIMIT [0x4F]

Range limits (max/min): 140/25 Units: degrees C. Command support: All functionality Note: Range cross-check – value must be greater than OT_WARN_LIMIT value.

OT_FAULT_RESPONSE [0x50]

Command support:

‐ Response settings (bits RSP0:1) – only setting of 10, unit shuts down and responds according to the retry settings

below.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault) and 111 unit continuously

restarts (normal startup) while fault is present until commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the OT_FAULT_RESPONSE command are;

‐ The unit shuts down in response to an over-temperature condition. ‐ The unit will continuously restart (normal startup) while the over-temperature condition is present until it is

commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r/w r/w r/w r r r Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0] Default Value 1 0 1 1 1 0 0 0

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

OT_WARN_LIMIT [0x51]

Range limits (max/min): 125/25 Units: degrees C. Command support: All functionality Note: Range cross-check – value must be less than OT_FAULT_LIMIT value.

VIN_OV_FAULT_LIMIT [0x55]

Range limits (max/min): 90/48 Units: volt Command support: All functionality

VIN_OV_FAULT_RESPONSE [0x56]

Command support: Response settings (bits RSP0:1) – only settings of 11 (The device’s output is disabled while the fault is present.) and 10, unit shuts down and responds according to the retry settings below.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault). ‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the VIN_OV_FAULT_RESPONSE command are;

‐ The unit shuts down in response to a VIN over voltage condition. ‐ The unit will continuously restart (normal startup) while the VIN over voltage condition is present until it is

commanded off, bias power is removed, the VIN over voltage condition is removed, or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r/w r r r r r r Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0] Default Value 1 1 0 0 0 0 0 0

POWER_GOOD_ON [0x5E]

Range limits (max/min): 13.2/8.1 Units: volt Command support: full support Note: Range cross-check – value must be greater than POWER_GOOD_OFF value by 1.6V.

POWER_GOOD_OFF [0x5F]

Range limits (max/min): 13.2/8.1 Units: volt Command support: full support Note: Range cross-check – value must be less than POWER_GOOD_ON value by 1.6V.

TON_DELAY [0x60]

Range limits (max/min): 500/0 Units: milliseconds Command support: full support

TON_RISE [0x61]

Range limits (max/min): 500/15 Units: milliseconds Command support: full support

4 3 2

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

STATUS_WORD [0x79]

Command support: full implementationfor supported functions (note: Fans, MFR_SPECIFIC,Unknown not supported)

Format 8 bit unsigned (bit field) Bit Position 15 14 13 12 11 10 9 8 Access r r r r r r r r

Function VOUT

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r

Function

(1) Not supported

BUSY

I/POUT

OUTPUT

_OFF

INPUT

VOUT_OV

_FAULT

MFR_SPEC1

IOUT_OC

_FAULT

#PWR_

GOOD

VIN_UV _FAULT

FANS1 OTHER1

TEMP CML

STATUS_VOUT [0x7A]

Command support: VOUT_OV_FAULT support, all bit reset supported

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r/reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function

(1) Not supported

VOUT_OV

_FAULT

VOUT_OV

_WARN

VOUT_UV

_WARN1

VOUT_UV

_FAULT1

VOUT_

MAX

_WARN

TON_ MAX_

FAULT1

TOFF_

MAX_

WARN1

KNOWN

NONE OF

ABOVE

VOUT

TRACKING

ERROR1

STATUS_IOUT [0x7B]

Command support: IOUT_OC_FAULT support, all bit reset supported

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset Function

(1) Not supported

IOUT_OC

_FAULT

IOUT_OC _LV

_FAULT

IOUT_OC

_WARN

IOUT_UC

_FAULT1

Current Share

Fault1

In Power

Limiting

Mode

POUT_OP

_FAULT

POUT_OP

_WARN1

STATUS_INPUT [0x7C]

Command support: VIN_OV_FAULT support, all bit reset supported

Format 8 bit unsigned (bit field) Bit Position 7 6 5 Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function

(1) Not supported

VIN_OV _FAULT

VIN_OV

_WARN

VIN_UV

_WARN1

VIN_UV _FAULT

Unit Off

(low input

voltage)

IIN_OC

_FAULT

1 0

IIN_OC

_WARN1

PIN_OP

_WARN1

STATUS_TEMPERATURE [0x7D]

Command support: OT_WARN, OT_FAULT supported, all bit reset supported

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function OT_ FAULT OT_ WARN

(1) Not supported

UT_

WARN

UT_

FAULT1

reserved reserved reserved reserved

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

STATUS_CML [0x7E]

Command support: PEC_FAULT, INVALID_DATA, INVALID_CMD supported, others TBD, all bit reset supported

Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Memory/

Logic fault

(other)1

Function

(1) Not supported

INVALID

CMD

INVALID

DATA

PEC FAILED

MEMORY

FAULT

PROC

FAULT1

reserved

COM

FAULT

(other)

READ_VIN [0x88]

Command support: full support

READ_VOUT [0x8B]

Command support: full support

READ_IOUT [0x8C]

Command support: full support

READ_TEMP1 [0x8D]

Command support: full support

MFR_DEVICE_TYPE [0xD0]

Command support: partial support in place (Mod Name), additional functionality TBD

Format Unsigned Binary Bit Pos. 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Access r/w r/w r/w r/w r/w r r r r/w r/w r/w r/w r/w r/w r/w r/w Function Reserved Module Name WPE Res Default 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 0

Byte Bit Description Value

High Byte 7:0 Reserved

7:2 Module Name

Low Byte

1. Present module designations (Non-isolated units will have a 0XXXXX format)

1 WPE

0 Reserved 0 Reserved

a. QBDW033A0B4xxx: 100000 b. QBDW025A0B4xxx: 100001 c. EBDW025A0B4xxx: 100010 d. EBDW020A0B4xxx: 100011

100000..111111 Module Name 0 Write Protect Enable not active. 1 Write Protect Enable active.

Meaning

MFR_VOUT_READ_CAL_GAIN [0xD1]

Factory default: 0x2000 Range limits (max/min): 0x2666/0x1999 Units: N/A Command support: support for VOUT gain calibration (factor in flash), lockout per MFR_DEVICE_TYPE

MFR_VOUT_READ_CAL_OFFSET [0xD2]

Range limits (max/min): exp must = -12 Units: N/A Command support: support for VOUT offset calibration (factor in flash), lockout per MFR_DEVICE_TYPE

MFR_VIN_READ_CAL_GAIN [0xD3]

Factory default: 0X2000 Range limits (max/min): 0x2666/0x1999 Command support: support for VIN gain calibration (factor in flash), lockout per MFR_DEVICE_TYPE

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

MFR_VIN_READ_CAL_OFFSET [0xD4]

Data format: VIN linear format Range limits (max/min): exp must = -3 Units: N/A Command support: support for VIN offset calibration (factor in flash), lockout per MFR_DEVICE_TYPE

MFR_IOUT_CAL_GAIN [0xD6]

Range limits (max/min): 0x2666/0x1999 Units: N/A Command support: support for IOUT gain calibration, lockout per MFR_DEVICE_TYPE

MFR_IOUT_CAL_OFFSET [0xD7]

Range limits (max/min): exp must = -4 Units: N/A Command support: support for IOUT offset calibration, lockout per MFR_DEVICE_TYPE

MFR_FW_REV [0xDB]

Range limits (max/min): 0 - 0xff (0.00 – 15.15) Units: N/A Command support: full read support

MFR_CPIN_ARA_CONFIG [0xE0]

Command Code Command support: Full support.

Command Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r r/w r/ w r/ w r/ w r/ w Function Reserved ARA Assignment Table Default Value 0 0 0 0 0 0 0 0

Bit Description Value Meaning

7:5 Reserved 000 Reserved

4 ARA

3:0

Configuration*

* All QBDW without –P option

Bit Description Value Meaning

7:5 Reserved 000 Reserved

4 ARA

3:0

Configuration**

** All QBDW with –P option

MFR_CPIN_ARA_CONFIG

1 ARA functional, module responds to ARA when SMBLAERT is asserted

0000

CPIN

0001

0010

0000

ARA not functional, module remains at resistor programmed address when SMBLAERT is asserted

T/C1 pin ON/OFF (Secondary) C2 pin: POWER_GOOD

T/C1 pin: TRIM C2 pin: POWER_GOOD

T/C1 pin: TRIM C2 pin: ON/OFF (Secondary)

ARA not functional, module remains at resistor programmed address when SMBLAERT

is asserted

1 ARA functional, module responds to ARA when SMBLAERT is asserted

T/C1 pin: ON/OFF (Secondary) C2 pin: POWER_GOOD

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

MFR_ C2_LOGIC [0xE1]

Command Code Command support: full support (bits 0 and 1) as follows:

Command Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r/ w r/ w Function Reserved On/Off(primary & secondary) combination logic Default Value 0 0 0 0 0 0 0 0

Bit Description Value Meaning

7:2 Reserved 000000 Reserved

MFR_POWER_GOOD_POLARITY [0xE2]

Command support: full support (bit 0) as follows: Bit 0: 0 = Negative PGOOD logic (module PGOOD asserted when pin is LO, PGOOD de-asserted when pin is HI) 1 = Positive PGOOD logic (module PGOOD de-asserted when pin is LO, PGOOD asserted when pin is HI)

Command Format 8 bit unsigned (bit field) Bit Position 7 6 5 4 3 2 1 0 Access r r r r r r r r/ w Function Reserved logic Default Value 0 0 0 0 0 0 0 1

MFR_C2_LOGIC

ON/OFF

Configuration

Secondary Side

ON/OFF Logic

MFR_POWER_GOOD_POLARITY

0 Secondary side on/off pin state when mapped to either T/C1 or C2 is ignored 1 AND – Primary and Secondary side on/off 0 Negative Logic (Low Enable: Input < 0.8V wrt Vout(-) 1 Positive Logic (High Enable: Input > 2.0V wrt Vout(-)

MFR_MODULE_DATE_LOC_SN [0xF0]

Command support: read/write support for 12 byte block, lockout per MFR_DEVICE_TYPE

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

PMBus Command Quick Reference Table

PMBUS CMD

OPERATION 0x01 1 Bit field N/A R/W byte 0x80

ON_OFF_CONFIG 0x02 1 Bit field N/A R/W byte

CLEAR_FAULTS 0x03 0 N/A N/A Send byte none STORE_DEFAULT_ALL 0x11 0 N/A N/A Send byte none RESTORE_DEFAULT_ALL 0x12 0 N/A N/A Send byte none VOUT_MODE 0x20 1 mode + exp N/A Read byte 0x14 VOUT_COMMAND 0x21 2 VOUT linear Volts R/W word 12.000V VOUT_CAL_OFFSET 0x23 2 VOUT linear Volts R/W word MS VOUT_MARGIN_HIGH 0x25 2 VOUT linear Volts R/W word 12.600V VOUT_MARGIN_LOW 0x26 2 VOUT linear Volts R/W word 11.400V VOUT_DROOP 0x28 2 VOUT linear mV/A R/W word 0 VIN_ON 0x35 2 VIN linear v R/W word 35.000V VIN_OFF 0x36 2 VIN linear v R/W word 33.000V VOUT_OV_FAULT_LIMIT 0x40 2 VOUT linear v R/W word 15.000V VOUT_OV_FAULT_RESPONSE 0x41 1 Bit field N/A R/W byte 0xB8 IOUT_OC_FAULT_LIMIT 0x46 2 IOUT linear Amps R/W word 30.250A IOUT_OC_FAULT_RESPONSE 0x47 1 Bit field N/A R/W byte 0xF8 IOUT_OC_WARN_LIMIT 0x4A 2 IOUT linear Amps R/W word 27.250A OT_FAULT_LIMIT 0x4F 2 TEMP linear Deg. C R/W word 140C OT_FAULT_RESPONSE 0x50 1 Bit field N/A R/W byte 0xB8 OT_WARN_LIMIT 0x51 2 TEMP linear Deg. C R/W word 125C VIN_OV_FAULT_LIMIT 0x55 2 VIN linear v R/W word 85V VIN_OV_FAULT_RESPONSE 0x56 1 Bit field N/A R/W byte 0xC0 POWER_GOOD_ON 0x5E 2 VOUT linear v R/W word 10.100V POWER_GOOD_OFF 0x5F 2 VOUT linear V R/W word 8.500V TON_DELAY 0x60 2 Time linear msec R/W word 10ms TON_RISE 0x61 2 Time linear msec R/W word 15ms STATUS_WORD 0x79 2 Bit field N/A Read word N/A STATUS_VOUT 0x7A 1 Bit field N/A Read byte N/A STATUS_IOUT 0x7B 1 Bit field N/A Read byte N/A STATUS_INPUT 0x7C 1 Bit field N/A Read byte N/A STATUS_TEMPERATURE 0x7D 1 Bit field N/A Read byte N/A STATUS_CML 0x7E 1 Bit field N/A Read byte N/A READ_VIN 0x88 2 VIN linear v Read word N/A READ_VOUT 0x8B 2 VOUT linear v Read word N/A READ_IOUT 0x8C 2 IOUT linear Amps Read word N/A READ_TEMP1 0x8D 2 TEMP linear Deg. C Read word N/A PMBUS_REVISION 0x98 1 Bit Field n/a Read byte 1.2 MFR_DEVICE_TYPE 0xD0 2 Custom N/A R/W word 0x0085 MFR_VOUT_READ_CAL_GAIN 0xD1 2 16 bit unsigned N/A R/W word 0x2000 MFR_VOUT_READ_CAL_OFF 0xD2 2 VOUT linear N/A R/W word MS MFR_VIN_READ_CAL_GAIN 0xD3 2 16 bit unsigned N/A R/W word MS MFR_VIN_READ_CAL_OFF 0xD4 2 VIN linear N/A R/W word MS MFR_IOUT_CAL_GAIN 0xD6 2 16 bit unsigned N/A R/W word MS MFR_IOUT_CAL_OFFSET 0xD7 2 IOUT linear N/A R/W word MS MFR_FW_REV 0xDB 2 8 bit unsigned N/A Read byte 0xMj.Mn.Bh.Bl MFR_C1_C2_ARA_CONFIG 0xE0 1 Bit field N/A R/W byte 0x00 MFR_ C2_LOGIC 0xE1 1 Bit field N/A R/W byte 0x00 MFR_PGOOD _POLARITY 0xE2 1 Bit field N/A R/W byte 0x01 MFR_MOD_DATE_LOC_SN 0xF0 12 8 bit char N/A R/W block YYLLWW123456

CMD

CODE

MS=Module specific

DATA

BYTES

DATA FORMAT

DATA

UNITS

TRANSFER TYPE DEFAULT VALUE

0x1D (Neg Logic)

0x1F (Pos Logic)

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Mechanical Outline for QBDW025A0B Through-hole Module

Dimensions are in millimeters and [inches]. Tolerances: x.x mm  0.5 mm [x.xx in.  0.02 in.] (Unless otherwise indicated) x.xx mm  0.25 mm [x.xxx in  0.010 in.]

Number Pin Name

TOP VIEW*

SIDE VIEW

BOTTOM VIEW

1 VIN(+) 2 ON/OFF 3 VIN(-) 4 VOUT(-) 5 SENSE(-) 6 TRIM/C1 7 SENSE(+) 8 VOUT(+)

9 C2 10 SIG_GND 11 DATA 12 SMBALERT 13 CLK 14 ADDR1 15 ADDR0

*Top side label includes GE name, product designation, and data code. ** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options.

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Mechanical Outline for QBDW025A0B–H (Baseplate version) Module

Dimensions are in millimeters and [inches]. Tolerances: x.x mm  0.5 mm [x.xx in.  0.02 in.] (Unless otherwise indicated) x.xx mm  0.25 mm [x.xxx in  0.010 in.]

TOP VIEW

SIDE VIEW*

BOTTOM VIEW***

Number Pin Name

1 VIN(+) 2 ON/OFF 3 VIN(-) 4 VOUT(-) 5 SENSE(-) 6 TRIM/C1 7 SENSE(+) 8 VOUT(+)

9 C2 10 SIG_GND 11 DATA 12 SMBALERT 13 CLK 14 ADDR1 15 ADDR0

*Side label includes product designation, and data code. ** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options. ***Bottom label includes GE name, product designation, and data code

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Recommended Pad Layouts

Dimensions are in millimeters and [inches]. Tolerances: x.x mm  0.5 mm [x.xx in.  0.02 in.[ (unless otherwise indicated) x.xx mm  0.25 mm [x.xxx in  0.010 in.]

Through-Hole Modules

Number Pin Name

1 VIN(+) 2 ON/OFF 3 VIN(-) 4 VOUT(-) 5 SENSE(-) 6 TRIM/C1 7 SENSE(+) 8 VOUT(+)

9 C2 10 SIG_GND 11 DATA 12 SMBALERT 13 CLK 14 ADDR1 15 ADDR0

Hole and Pad diameter recommendations:

Pin Number Hole Dia mm [in] Pad Dia mm 1, 2, 3, 5, 6, 7 1.6 [.063] 2.1 [.083] 4, 8 2.2 [.087] 3.2 [.126] 9, 10, 11, 12, 13, 14, 15 1.0 [.039] 1.5 [.059]

[in]

Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Ordering Information

Please contact your GE Sales Representative for pricing, availability and optional features.

Table 1. Device Codes

Product codes Input Voltage

QBDW025A0B41Z

QBDW025A0B41-HZ

QBDW025A0B641-HZ

QBDW025A0B641-PHZ

Table 2. Device Options

48V (3675Vdc) 48V (3675Vdc) 48V (3675Vdc) 48V (3675Vdc)

Output

Voltage

12V 25A 95.9% Through hole CC109171022

12V 25A 95.9% Through hole 150023016

12V 25A 95.9% Through hole CC109171311

12V 25A 95.9% Through hole CC109173084

Output

Current

Efficiency

Connector

Type

Comcodes

For more information, call us at

USA/Canada:

+1 888 546 3243, or +1 972 244 9288

Asia-Pacific:

+86.021.54279977*808

Europe, Middle-East and Africa:

+49.89.878067-280

India: +91.80.28411633

www.ge.com/powerelectronics

GE Industrial Solutions QBDW025A0B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual