GE Industrial Solutions QBDW033A0B User Manual

Data Sheet

QBDW033A0B Barracuda* Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

RoHS Compliant

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)

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 >95.3% at 12V

rated output

 Wide input voltage range: 36-75V  Delivers up to 33A  Remote sense and output voltage trim  Fully very tightly regulated output voltage  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  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

No.60950-1-07, Second Edition + A1:2011 (MOD) Certified IEC 60950-1:2005 (2nd edition) + A1:2009 and EN 60950-1:2006 + 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

standards



ISO** 9001 and ISO14001 certified manufacturing facilities

60950-1-2011 Recognized, CAN/CSA† C22.2

output current

to 13.2Vdc

, 30% to 100%

PoE

Description

The QBDW033A0B Barracuda series of dc-dc converters are a new generation of DC/DC power modules designed to support 9.6

-12V

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 QBDW033A0B series operate from an input voltage range of 36 to 75V output power from output voltages of 12.1V control, synchronous rectification technology, a fully regulated control topology, and innovative packaging techniques to achieve efficiency exceeding 96% peak at 12V 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 eq uipment 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.

and provide up to 33A output current at output voltages from 8.1Vdc to 12Vdc, and 400W

to 13.2Vdc in a DOSA standard quarter brick. The converter incorporates digital

output. This leads to lower power dissipations such that for many applications a heat

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W 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 I

; 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

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Electrical Specifications (continued)

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

Parameter Device Symbol Min Typ Max Unit

Output Voltage Set-point (Default) (V

IN=VIN,nom

(Adjustable via PMBus)

Output Voltage Variation from Default (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

, IO=16.5A, TA =25°C)

All V

All w/o -

-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

)

O, max

), Intentional Droop

O, max

to I

O, min

O, max

)

All w/o -

-P

RMS (5Hz to 20MHz bandwidth) All

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

O, set

11.97 12.00 12.03 V

11.76

11.63

11.00

 



 

0.2

12.24 V

12.37 V

 

% V % V

0.50 Vdc



 

200



 

% V

O, set

rms

pk-pk

External Output Capacitance

>5000uF, IO must be < 50% I

For C

O, max

during T

rise

All C

Output Current All I VOUT_OC_FAULT_LIMIT (Default)

(Adjustable via PMBus) Efficiency V

IN=VIN, nom

IO=100% I IO=40% I

, TA=25°C

O, max, VO

to 75% I

O, max

= V

All  95.3 %

O,set

= V

O, max , VO

All  95.8 %

O,set

All I

Switching Frequency f

O, max

O,lim



10,000 F

0 33 Adc



150 kHz

Dynamic Load Response

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

F capacitor and across the load.)

470 Load Change from IO = 50% to 75% of I

Peak Deviation Settling Time (V

<10% peak deviation)

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

<10% peak deviation)

; TA=25°C;

nom

O,max

All

 __

__ __

500 700

 __

s

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 Weight – Open Frame 47.4 (1.67) g (oz.)

Weight – with Base plate option 66.4 (2.34) g (oz.)

All MTBF 3,108,685 Hours

All FIT 321.7 109/Hours

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W 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 Low = module Off, Logic High = module On

Logic Low Specification

On/Off Thresholds:

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

Logic Low Voltage All V Logic High Voltage – (Typ = Open Collector) All V Logic High 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 milliseconds (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) All V

VOUT_OV_FAULT_LIMIT (Adjustable via PMBus) All V

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 Low = module On, Logic High = module Off

= 2.0V)

on/off

=Time until VO = 10% of V

due to startup for parallel modules.

delay

from either

O,set

O=IO, max

)

=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

=2.2V)

terminal)

IN-

280

-0.3

2.0

 

   

 

O,set-

+2.5V



33 35 36 Vdc 31 33 34 Vdc

rise

O,set

, For

All I

All w/o -P T

All w/o-P

w/ -P T

w/ -P

All w/o -

w/ -P T

-P

Option

on/off

Enable with Vin

delay,

delay, Enable with

on/off

Enable with Vin

delay,

delay, Enable with

on/off

rise

diff

Sense

O, set

O,limit

ref

8.1



All All



1000

 

  



140



M

310 A

0.8 Vdc

14.5 Vdc

10 A

14.5 Vdc

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

Vdc



Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W 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#)

=2mA VOL 0.4 V

OUT

=3.6V I

OUT

0 10 A

Pin capacitance CO 0.7 pF

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

Slave Mode FPMB 5* 400 kHz

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 <33.0A I Output current reading accuracy (absolute

difference between actual and reported values) V

reading range V

OUT

reading resolution

OUT

reading accuracy

OUT

1.65A< Iout <16.5A

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

OUT(RNG)

OUT(BNK)

OUT(RES)

OUT(ACC)

OUT(RNG)

OUT(RES)

OUT(ACC)

IN(RNG)

IN(RES)

IN(ACC)

(RES)

(ACC)

1.6500 63.937 A 0 1.5875 A

62.5 mA

-5.0 -1.4 3.0 %

-1.7 2.5 A

15.999

0.244 mV

-2.0 0.6 2.0 %

127.87

125 mV

-4.0 0.8 4.0 %

0.25 °C

-5.0 5.0 %

EFFCIENCY

 (%)

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Characteristic Curves

The following figures provide typical characteristics for the QBDW033A0B (12V, 33A) 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)

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

(V) (50mV/div)

OUTPUT VOLTAGE,

TIME, t (2s/div)

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

LTA

(V) (20V/div)

INPUT V

LTA

(V) (5V/div) V

UTPUT V

TIME, t (20 ms/div)

o,max

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

(V) (200mV/div)

(A) (10A/div) V

OUTPUT CURRENT OUTPUT VOLTAGE

TIME, t (500 s/div)

Figure 4. Typical Transient Response to 0.1A/µs Step Change in Load from 50% to 75% to 50% of Full Load, Co=470µF and 48 Vdc Input.

(V)(2V/div)

ON/OFF

(V) (5V/div) V

OUTPUT VOLTAGE On/Off VOLTAGE

TIME, t (5 ms/div)

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

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W 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 8. Typical Output Voltage Regulation vs. Output

(V)

OUTPUT VOLTAGE, V

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

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

(V)

OUTPUT VOLTAGE, V

Current.

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

(V)

OUTPUT VOLTAGE, V

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W 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

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Feature Descriptions

Overcurrent Protection

To provide protection in a fault output overload condition, the QBDW033A0B 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 QBDW033A0B 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 QBDW033A0B 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-high 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 terminal (V equivalent (see Figure 14). A logic LO is V The typical I Terminal=0.3V) is 147µA. The switch should maintain a logiclow voltage while sinking 310µA. During a logic HI, the maximum V maximum allowable leakage current of the switch at V

2.0V is 10µA. If using an external voltage source, the maximum voltage V the V

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.

(-) terminal. Two factory configured

). The switch can be an open collector or

during a logic LO (Vin=48V, On/Off

on/off

generated by the power module is 8.2V. The

on/off

on the pin is 14.5V with respect to

on/off

= -0.3V to 0.8V.

on/off

(-).

(-)

on/off

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Feature Descriptions (continued)

Load Sharing

For higher power requirements, the QBDW033A0 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

(+) 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

 V

sharing to be functional.

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

start all modules in parallel.

 These modules contain means to block reverse current

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.

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

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

 Insure that the load is <50% I

all parallel modules have started (load full start > module

time max + T

delay

 If fault tolerance is desired in parallel applications, output

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

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 VO(–).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

(-) pins of all parallel modules must be

OUT

, as specified in the Feature

delay

rise

(for a single module) until

O,MAX

time).

rise

maximum rated power (Maximum rated power = Vo,set x Io,max).

Figure 15. Circuit

Configuration for remote sense.

Configurable Control Pins

The QBDW033A0B 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

Module

Code

Configuration

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

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

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

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-high voltage on the ON/OFF pin, and off during a logic low. Negative logic remote on/off turns the module off during a logic high, and on during a logic low. 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 V switch can be an open collector or equivalent (see Figure

13). A logic low is V

on/off

during a logic low is 330µA. The switch should maintain a logic-low voltage while sinking 250µA. During a logic high, the maximum V

(o) generated by the power module is

on/off

3.3V. The maximum allowable leakage current of the switch (o) = 2.0V is 130µA. If using an external voltage

at V

on/off

source, the maximum voltage V respect to the V

(-) terminal.

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

left N/C

(-) terminal (V

on/off

(o)). The

(o) = -0.3V to 0.8V. The typical I

on the pin is 3.3V with

on/off

(o)

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