GE Industrial Solutions CAR1212DC User Manual

GE

October 21, 2013

CAR

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

SMBusAlert signal pin alerts customers automatically of any state change within the power supply.

The PMBus name and logo are registered trademarks of the System Management Interface Forum (SMIF)

Data Sheet

1212DC series DC-DC converter

RoHS Compliant

Applications

• 48V

distributed power architectures

DC

• Cellular Base Stations

• Satellite Hubs

• Network Equipment

• Network Attached Storage

• Telecom Access Nodes

• Routers/Switches

• Broadband Switches

Features

• Input Or’ing

• Reverse input protection

• 3 front panel LEDs: 1-input;2-output; 3 - fault

• Output programmable from 10.8 – 13.2V

• Remote ON/OFF control of the 12V

• Remote sense (up to 0.25V) on the 12V

• No minimum load requirements

• Redundant parallel operation

• Active load sharing (single wire)

• Hot pluggable

• Efficiency: typically 90%

• Standby orderable either as 3.3V

• Auto recoverable OC & OT protection

• Operating temperature: -10 - 70°C (de-rated above 50°C)

• Digital status & control: I

• EN/IEC/UL60950-1 2

• CE mark

• EMI: class A FCC docket 20780 part 15, EN55022

• Meets EN6100 immunity and transient standards

• Shock & vibration: NEBS GR-63-CORE, level 3

2

C and PMBus serial bus

nd

edition; UL 1950, CSA C22.2-950

DC

or 5VDC

DC

output

DC

output

• ATE Equipment

Description

The CAR1212DC series of DC-DC Converters provide highly efficient isolated power from DC input mains in a compact 1U industry standard form factor at a power density of 16.2W/in CAR1212FP rectifier providing comprehensive solutions for systems connected either to commercial AC mains, 48/60V

power plants or telecom central offices. This plug and play approach offers significant advantages since

DC

systems can be reconfigured and repositioned readily by simply replacing the power supply. The high-density, frontto-back airflow is designed for minimal space utilization and is highly expandable for future growth. The industry

2

standard PMBus compliant I

*

UL is a registered trademark of Underwriters Laboratories, Inc.

†

CSA is a registered trademark of Canadian Standards Association.

‡

VDE is a trademark of Verband Deutscher Elektrotechniker e.V.

§ This product is intended for integration into end-user equipment. All CE marking procedures of end-user equipment should be followed. (The CE mark is placed on selected products.) ** ISO is a registered trademark of the International Organization of Standards

+

C communications buss offers a full range of control and monitoring capabilities. The

3

. These converters complement the

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 2

VDC

12VDC MAIN OUTPUT

Output power

P

OUT

0 1200

W

Set point @ 50% load

11.9

12.00

12.1

V

DC

Ripple and noise2

120

mV

Data Sheet

DC-DC converter

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 the device reliability.

Parameter Symbol Min Max Unit

Input Voltage: Continuous VIN 0 75 VDC

Operating Ambient Temperature TA -10 701 °C

Storage Temperature Tstg -40 85 °C

I/O Isolation voltage (100% factory Hi-Pot tested) 1500 VDC

Electrical Specifications

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

INPUT

Parameter Symbol Min Typ Max Unit

Operational Range

12VDC output turned OFF -35

V

IN

12VDC output turned ON -36

Idling Power 12VDC output OFF

12VDC output ON 45

Maximum Input Current VIN= -36VDC

(V

= V

OUT

O, set

, I

)

OUT=IO, max

Cold Start Inrush Current

(Excluding x-caps, 25°C, <10ms, per ETSI 300-132)

Efficiency

(T

=25°C, VIN= -48VDC, V

amb

Holdup time (VIN= -48VDC, V

= 12VDC, 60-80% load)

OUT

≥ 10.8Vdc, T

OUT

AMB

25°C, I

OUT=IO, max

)

W

I

IN

I

IN

η

T 2.5 ms

Isolation Input/Output

Input/Frame 1500

Output/Frame 100

-36 -48/60 -75

35

38 ADC

40 A

90 %

1500 V

VDC

W

PEAK

DC

Parameter Symbol Min Typ Max Unit

Overall regulation (load, temperature) -2 +2 % Remote sense sum of hot & return 0.25 VDC

1

Derated above 50°C at 2.5%/°C

2

Measured across a 10µf tantalum and a 0.1µf ceramic capacitors in parallel. 20MHz bandwidth

V

OUT

p-p

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 3

Turn-ON delay

T

2

sec

Programmable range (hardware3 & software)

10.8 13.2

V

I I

Set point (optional 5Vstb)

V

3.2

3.3

3.4

V

Overall regulation (load, temperature, aging)

V

-5 +5

%

Output current

I

0 1

A

Parameter

Min

Typ

Max

Units

Notes

Service Life

10 Yrs

Full load, excluding fans

12VDC MAIN OUTPUT (continued)

Parameter Symbol Min Typ Max Unit

Turn-ON overshoot

DC-DC converter

Data Sheet

V

OUT

3 %

Remote ON/OFF delay time Turn-ON rise time (10 – 90% of V

) 60 ms

OUT

Transient response 50% step [10%-60%, 50% - 100%] (dI/dt – 1A/µs, recovery 300µs)

Overvoltage protection, latched (recovery by cycling OFF/ON via hardware or software)

Output current V Current limit, Hiccup

Short circuit protection with auto recovery Active current share

= 12VDC I

OUT

V

OUT

40 ms

-5 +5 %

14.5 15.5 V

0 100 A

110 130 A

-5 +5 % of FL

DC

3.3VDC (5VDC) STANDBY OUTPUT

Parameter Symbol Min Typ Max Unit

OUT

Ripple and noise 50 664 mVp-p

OUT

DC

General Specifications

Reliability, 25C, full load

250,000

Hrs

MTBF per SR232 Reliability protection for electronic equipment, method I, case III,

Weight 1.45 (3.2) Kgs (Lbs)

Feature Specifications

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

Parameter Symbol Min Typ Max Unit

Remote ON/OFF (Pulled HI internally within the module ≈ 40kΩ to 5VDC)

Logic High (Module ON) – either N/C or apply V > 3VDC

Logic Low (Module OFF)

3

Setpoint can be voltage programmable or programmed by a resistor divider. An internal 20kΩ from V

complete the divider from V

4

Measured at the output with 0.1µf ceramic and a 10µf tantalum capacitor in parallel. 20mHz bandwidth limitation.

to output_return.

prog

0.7V

DD



 

0

prog



to 3.3Vdc is provided. Add a resistor to

I

IH

V

IH

I

IL

V

IL

20 µA

12 V

1 mA

0.8 VDC

DC

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 4

Write protect disabled

VI 0  0.8

VDC

Data Sheet

DC-DC converter

Feature Specifications (continued)

Parameter Symbol Min Typ Max Unit

Output Voltage programming (Vprog)

Equation: V

Vprog range

Programmed output voltage range Vo

Voltage adjustment resolution (8-bit A/D) Vo

Output configured to 13.2VDC

Output configured to the 12VDC set-point

Enable [short pin controlling presence of the 12VDC output]

12V output OFF VI

12V output ON VI

Write protect (Wp)

Write protect enabled VI

INPUT-OK (Pulled up internally to 3.3V via a 10kΩ resistor)

Logic High (Input within normal range)

Logic Low (Input out of range)

DC-OK (Pulled up internally to 3.3V via a 10kΩ resistor)

Logic High (Output voltage is present)

Logic Low (Output voltage is not present)

Temperature OK (Pulled up internally to 3.3V via a 10kΩ resistor)

Logic High (temperature within normal range)

Logic Low (temperature is too high)

Delayed shutdown after Logic Low transition Tdelay 10 sec

Fault (Pulled up internally to 3.3V via a 10kΩ resistor)

Logic High (No fault is present)

Logic Low (Fault is present)

PS Present

Logic High (Power supply is not plugged in)

Logic Low (Power supply is present) VIL 0

= 10.8 + (Vprog * 0.96)

OUT

V

I

V

I

V

I

V

prog

I

OH

I

OL

OH

I

OL

OH

I

OL

OH

I

OL

0

10.8



2.5 3.0 V

3.0

0.7V

DD

0

DD

0.7V

DD



10

 



 

0.7V

0

DD



 

0.7V

0

DD



 

0.7V

0

DD



 

0



2.5 VDC

13.2 VDC



12 V

0.8 VDC

12 V

20 µA

12 V

20 mA

0.4 VDC

20 µA

12 V

20 mA

0.4 VDC

20 µA

12 V

20 mA

0.4 VDC

20 µA

12 V

20 mA

0.4 VDC

0.1 VDC

mVDC

DC

VDC

DC

GE

Data Sheet

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 5

V

measurement accuracy

Temp measurement accuracy5

DC-DC converter

Feature Specifications (continued)

Parameter Symbol Min Typ Max Unit

SMBAlert# (Interrupt) (Pulled up internally to 3.3V via a 10kΩ resistor)

Logic High (No Alert - normal)

Logic Low (Alert is set)

I

OH

V

OH

I

OL

VOL 0

Output current monitor (Imon)

Resolution

Accuracy

Measurement range

Analog output range

Sourced output current

I

o

V

mon

I

o

Digital Interface Specifications

0.7V

DD

 



20 µA

12 V

20 mA

0.4 VDC

100 mV/A

-250 +250 mV

0 100 A

0 10 V

5 mADC

DC

Parameter Conditions Symbol Min Typ Max Unit

PMBus Signal Interface Characteristics

Input Logic High Voltage (CLK, DATA) VIH 2.1 3.6 VDC

Input Logic Low Voltage (CLK, DATA) VIL 0 0.8 VDC

Input high sourced current (CLK, DATA) IIH 0 10 μA

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

=3.5mA VOL 0.4 VDC

OUT

Output Low sink current (CLK, DATA, SMBALERT#) IOL 3.5 mA

Output High open drain leakage current (CLK,DATA, SMBALERT#)

=3.6V I

V

OUT

OH

0 10 μA

PMBus Operating frequency range Slave Mode FPMB 10 400 kHz

Measurement System Characteristics

Clock stretching tSTRETCH 25 ms

I

measurement range

OUT

I

measurement accuracy 25°C

OUT

V

measurement range

OUT

Temp measurement range

Linear

V

Linear

I

RNG

I

ACC

V

0 14 VDC

OUT(rng)

OUT(acc)

Temp

(rng)

Temp

(acc)

0 100 A

-10 +10 %

-5 +5 %

0 120

-5 +5 %

DC

°C

5

Temperature accuracy reduces non-linearly with decreasing temperature

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 6

Parameter

Min

Typ

Max

Units

Notes

Ambient Temperature

-106 70

°C

Air inlet from sea level to 5,000 feet.

Power Derating with Temperature

2.5

%/°C

Humidity

DC-DC converter

Environmental Specifications

Storage Temperature -40 85 °C

Operating Altitude 2250/7382 m / ft

Non-operating Altitude 8200/30k m / ft

Operating Temperature Derating with Altitude

Acoustic noise 55

Operating Storage

Shock and Vibration acceleration 6 Grms

Earthquake Rating 4

2.0

30 10

95 95

°C/305 m

°C/1000 ft

dbA

% %

Zone

Data Sheet

51°C to 70°C7

Above 2250/7382 m/ft; 3962/13000 m/ft max

25°C, half load

Relative humidity, non-condensing

NEBS GR-63-CORE, Level 3, 20 -2000Hz, min 30 minutes

NEBS GR-63-CORE, all floors, Seismic Zone 4 Designed and tested to meet NEBS specifications.

EMC Compliance

EMC

Parameter Criteria Standard Level Test

Conducted emissions EN55022, FCC Docket 20780 part 15, subpart J

DC input

Radiated emissions EN55022 A 30 – 10000MHz

Voltage dips EN61000-4-11 B -30%, 10ms

DC input immunity

Enclosure immunity

Voltage surge EN61000-4-5 A 2kV, 1.2/50µs, common mode

Fast transients EN61000-4-4 B 5/50ns, 1kV (common mode)

Conducted RF fields EN61000-4-6 A 130dBµV, 0.15-80MHz, 80%

Radiated RF fields EN61000-4-3, level 3 A 10V/m, 80-1000MHz, 80% AM

ESD EN61000-4-2, level 3 B 6kV contact, 8kV air

Telcordia GR1089-CORE, Class A

ENV50140 A

A 0.15 – 30MHz

B -60%, 100ms

B -100%, 5sec

A 1kV, 1.2/50µs, differential

mode

AM

6

Designed to start at an ambient down to -40°C; meet spec after ≅ 30 min warm up period, may not meet operational limits below -10°C.

7

The maximum operational ambient is reduced in Europe in order to meet certain power cord maximum ratings of 70°C. The maximum

operational ambient where 70°C rated power cords are utilized is reduced to 60°C until testing demonstrates that a higher level is acceptable.

GE

CAR1212DC series

DC-DC converter

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 7

Output current, A

TIME, t (50ms/div)

Figure 1. Converter Efficiency versus Output Current.

Figure 2. Input start up (Vin: -48VDC, full load).

V

3.3

(V) (2V/div), DCOK (2V/div)

OUTPUT VOLTAGE

TIME, t (2ms/div)

TIME, t (5ms/div)

Figure 3. Start-up Using Remote On/Off

Figure 4. 12V start-up (Vin: -48VDC, full load)

V

3.3

(V) (2V/div), DCOK (2V/div)

Figure 5. 12V output ripple and noise (Vin: -48VDC, full load).

Figure 6. Turn-OFF via Remote ON/OFF

70

75

80

85

90

95

10 30 50 70 90 110

Input

3.3Vsb

12V

DCOK

12V

DCOK

3.3Vsb

Remote ON/OFF

3.3Vsb

DCOK

12V

Characteristic Curves

The following figures provide typical characteristics for the CAR1212DC converter at 25oC

(V) (5V/div)

O

Data Sheet

EFFICIENCY, η (%)

(V) (5V/div)

O

(V) (5V/div), V

ON

V

(Vin: -48VDC, full load)

(V) (50V/div), V

(V) (2V/div), DCOK (2V/div)

IN

3.3

V

(V) (5V/div)

O

V

(V) (50mV/div)

O

V

OUTPUT VOLTAGE

TIME, t (5µs/div) TIME, t (10ms /div)

(V) (5V/div)

O

(V) (5V/div), V

ON

V

(Vin: -48VDC, full load)

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 8

OUTPUT VOLTAGE OUUTPUT CURRENT

TIME, t (1ms/div)

Figure 7. Transient response 12VDC output

Figure 8. Transient response 12VDC output

Table 9. Current share between two modules

Table 10. Input Turn OFF and Turn ON.

OUTPUT VOLTAGE INPUT VOLTAGE

Figure 11. Overload: output short circuit performance, the unit is in

Figure 12. Holdup time: full load Vin = -48VDC duration: 2.84ms

Io

PS1 I1 (A)

PS2 I2 (A)

% Share

0 A - -

-

20 A

8.10

11.80

18.59

40 A

17.30

22.70

13.50

60 A

28.30

31.40

5.19

80 A

39.40

40.80

1.75

100 A

50.00

50.30

0.30

120 A

60.90

59.60

1.08

140 A

70.40

69.40

0.72

160 A

80.90

79.70

0.75

180 A

91.40 89.50

1.05

200 A

101.90

98.80

1.54

DC-DC converter

Characteristic Curves (continued)

The following figures provide typical characteristics for the CAR1212DC converter at 25oC.

(I) (50A/div)

O

(V) (200mV/div) I

O

V

load step 10 – 60A, V

= -48VDC.

IN

(I) (50A/div)

O

(V) (200mV/div) I

O

V

load step 50 – 100A, V

= -48VDC.

IN

Data Sheet

OUTPUT VOLTAGE OUUTPUT CURRENT

SYSTEM CURRENT

(I) (100A/div)

O

(V) (5V/div) I

O

V

CONDITION No Load Max Load

V

@ TURN ON 32.7VDC 32.6VDC

OUT

INDIVIDUAL UNIT CURRENTS AND % SHARE

TIME, t (500ms/div) TIME, t (1ms/div)

V

@ TURN OFF 29.5VDC 30.5VDC

OUT

(V) (20V/div)

IN

(V) (5V/div) V

O

V

hiccup mode. , V

= -48VDC.

IN

GE

CAR1212DC series

DC-DC converter

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 9

Device

Address

Address Bit Assignments

(Most to Least Significant Bit)

MCU

0xBx

1 0 1 1 A2

A1

A0

R/W

Broadcast

0x00

0 0 0 0 0 0 0

0

EEPROM

0xAx

1 0 1 0 A2

A1

A0

R/W

Control and Status

Control hierarchy: Some features, such as output voltage,

can be controlled both through hardware and firmware. For example, the output voltage is controlled both by the signal pin (Vprog) and the PMBus command, (Vout_command) .

Using output voltage as an example; the Vprog signal pin has ultimate control of the output voltage until the Vprog is either > 3VDC or a no connect. When the programming signal via Vprog is either a no connect or > 3V output voltage is set at its nominal 12V output voltage can be controlled via the PMBus command, (Vout_command).

Analog controls: Details of analog controls are provided in

this data sheet under Signal Definitions.

Common ground: All signals and outputs are referenced to

Output return. These include ‘Vstb return’ and ‘Signal return’.

Control Signals

Voltage programming (Vprog): An analog voltage on this signal can

vary the output voltage from 10.8V this signal is:

V

= 10.8 + (Vprog * 0.96) where Vprog = 0.1 to 2.5V

OUT

Between 2.5 and 3V the output stays at 13.2V left open, the programming signal is ignored and the unit output is set at the setpoint of 12V

Load share (Ishare): This is a single wire analog signal that is

generated and acted upon automatically by power supplies connected in parallel. The Ishare pins should be tied together for power supplies if active current share among the power supplies is desired. No resistors or capacitors should get connected to this pin.

Remote ON/OFF: Controls presence of the main 12V

voltage on the output connector. This signal is pulled HI internally. Leaving this pin a no-connect turns ON the 12V Logic 0 (TTL LO level) to this pin turns OFF the 12V

A turn OFF command either through this signal (Remote ON/OFF) or firmware commanded would turn OFF the 12V output.

Enable: This is a short signal pin that controls the presence of the

on the output connector. This pin should be connected to

12V

DC

‘output return’ on the system side of the output connector. The purpose of this pin is to ensure that the output turns ON after engagement of the power blades and turns OFF prior to disengagement of the power blades.

Write protect (WP): This signal protects the contents of the EEPROM

from accidental over writing. When left open the EEPROM is write protected. A LO (TTL compatible) permits writing to the EEPROM. This signal is pulled HI internally by the power supply.

.

DC

to 13.2VDC. The equation of

DC

Status signals

Output current monitor (Imon): A voltage level proportional to the

delivered output current is present on this pin. The signal level is

0.1V per amp ± 0.25V.

INPUT OK: A TTL compatible status signal representing whether the

input voltage is within the anticipated range. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that the input voltage is applied within the specified input range.

DC OK: A TTL compatible status signal representing whether the

output voltage is present. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that the output voltage is present.

, it is ignored, the

DC

and the unit

DC

. If Vprog is > 3V, or

DC

output

DC

output. Applying a

DC

output.

DC

Data Sheet

Temperature OK: A TTL compatible status signal representing

whether an over temperature exists. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that temperatures are normal.

If an over temperature should occur, this signal would pull LO for approximately 10 seconds prior to shutting down the power supply. The unit would restart if internal temperatures reduce within normal operational levels. At that time the signal reverts back to its open collector (HI) state.

Fault: A TTL compatible status signal representing whether a Fault

occurred. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that no Fault is present.

This signal activates for OTP, OVP, OCP, INPUT fault or No output.

PS Present: This pin is connected to ‘output return’ within the power

supply. Its intent is to indicate to the system that a power supply is present. This signal may need to be pulled HI externally through a resistor to detect a missing module.

Interrupt (SMBAlert): A TTL compatible status signal, representing

the SMBusAlert# feature of the PMBus compatible i power supply. This signal needs to be pulled HI externally through a resistor. Open collector (HI) on this signal indicates that no Interrupt has been triggered.

Serial Bus Communications

The I²C interface incorporated within the CAR1212DC modules facilitates the monitoring and control of various operating parameters within the unit and transmits these on demand over an industry standard I²C Serial bus.

All signals are referenced to ‘Signal Return’.

Device addressing: The microcontroller (MCU) and the EEPROM have

the following addresses:

The Global Broadcast instruction executes a simultaneous write instruction to all power supplies. A read instruction cannot be accessed globally. The three programmable address bits are the same for all I

Address lines (A2, A1, A0): These signal pins allow up to eight (8)

CAR1212DC modules to be addressed on a single I²C bus. The pins are pulled HI internal to the power supply. For a logic LO these pins should be connected to ‘Output Return’

Serial Clock (SCL): The clock pulses on this line are generated by the

host that initiates communications across the I²C Serial bus. This signal is pulled up internally to 3.3V by a 10kΩ resistor. The end user should add additional pull up resistance as necessary to ensure that rise and fall time timing and the maximum sink current is in compliance to the I²C specifications.

Serial Data (SDA): This line is a bi-directional data line. . This signal is

pulled up internally to 3.3V by a 10kΩ resistor. The end user should

add additional pull up resistance as necessary to ensure that rise and fall time timing and the maximum sink current is in compliance to the I²C specifications.

2

C accessible devices within the power supply.

2

C protocol in the

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 10

1 8 1 8 1 S Slave address

Wr A Command Code

A 8 1 8

1 8 1

1

Low data byte

A

High data byte

A

PEC A P

Clock Stretch

DC-DC converter

Digital Feature Descriptions

PMBus™ compliance: The power supply is fully compliant to the

Power Management Bus (PMBus™) rev1.2 requirements. Manufacturer specific commands located between addresses 0xD0

to 0xEF provide instructions that either do not exist in the general PMBus specification or make the communication interface simpler and more efficient.

Master/Slave: The ‘host controller’ is always the MASTER. Power

supplies are always SLAVES. SLAVES cannot initiate communications or toggle the Clock. SLAVES also must respond expeditiously at the command of the MASTER as required by the clock pulses generated by the MASTER.

Clock stretching: The ‘slave’ µController inside the power supply

may initiate clock stretching if it is busy and it desires to delay the initiation of any further communications. During the clock stretch the ‘slave’ may keep the clock LO until it is ready to receive further instructions from the host controller. The maximum clock stretch interval is 25ms.

The host controller needs to recognize this clock stretching, and refrain from issuing the next clock signal, until the clock line is released, or it needs to delay the next clock pulse beyond the clock stretch interval of the power supply.

Note that clock stretching can only be performed after completion of transmission of the 9 command.

Figure 13. Example waveforms showing clock stretching.

I²C Bus Lock-Up detection: The device will abort any transaction and drop off the bus if it detects the bus being held low for more than 35ms.

Communications speed: Both 100kHz and 400kHz clock rates are

supported. The power supplies default to the 100kHz clock rate. The minimum clock speed specified by SMBus is 10 kHz.

Packet Error Checking (PEC): Although the power supply will

respond to commands with or without the trailing PEC, it is highly recommended that PEC be used in all communications. The integrity of communications is compromised if packet error correction is not employed. There are many functional features, including turning OFF the main output, that should require validation to ensure that the correct command is executed.

PEC is a CRC-8 error-checking byte, based on the polynomial C(x) =

8

x

+ x2 + x + 1, in compliance with PMBus™ requirements. The calculation is based in all message bytes, including the originating write address and command bytes preceding read instructions. The PEC is appended to the message by the device that supplied the last byte.

SMBAlert#: The µC driven SMBAlert# signal informs the

‘master/host’ controller that either a STATE or ALARM change has occurred. Normally this signal is HI. The signal will change to its LO level if the power supply has changed states and the signal will be latched LO until the power supply either receives a ‘clear’ instruction as outlined below or executes a READ STATUS_WORD. If the alarm state is still present after the STATUS registers were reset, then the signal will revert back into its LO state again and will latch until a subsequent reset signal is received from the host controller.

th

ACK bit, the exception being the START

Data Sheet

The signal will be triggered for any state change, including the following conditions;

• VIN and under or over voltage

• IOUT over current

• Over Temperature warning or fault

• Fan Failure

• Communication error

• PEC error

• Invalid command

• Internal faults

The power supply will clear the SMBusAlert# signal (release the signal to its HI state) upon the following events:

• Receiving a CLEAR_FAULTS command

• The main output recycled (turned OFF and then ON) via the

ENABLE signal pin

• The main output recycled (turned OFF and then ON) by the

OPERATION command

• Execution of a READ of the STATUS_WORD register

Global broadcast: This is a powerful command because it can

instruct all power supplies to respond simultaneously in one command. But it does have a serious disadvantage. Only a single power supply needs to pull down the ninth acknowledge bit. To be certain that each power supply responded to the global instruction, a READ instruction should be executed to each power supply to verify that the command properly executed. The GLOBAL BROADCAST command should only be executed for write instructions to slave devices.

Read back delay: The power supply issues the SMBAlert #

notification as soon as the first state change occurred. During an event a number of different states can be transitioned to before the final event occurs. If a read back is implemented rapidly by the host a successive SMBAlert# could be triggered by the transitioning state of the power supply. In order to avoid the triggering of successive SMBAlert# s and thus reading a transitioning state, it is prudent to wait more than 2 seconds after the receipt of an SMBAlert# before executing a read back. This delay will ensure that only the final state of the power supply is captured.

Successive read backs: Successive read backs to the power supply

should not be attempted at intervals faster than every one second. This time interval is sufficient for the internal processors to update their data base so that successive reads provide fresh data.

PMBusTM Commands

Standard instruction: Up to two bytes of data may follow an

instruction depending on the required data content. Analog data is always transmitted as LSB followed by MSB. PEC is optional and includes the address and data fields.

Master to Slave Slave to Master SMBUS annotations; S – Start , Wr – Write, Sr – re-Start, Rd – Read, A – Acknowledge, NA – not-acknowledged, P – Stop

GE

CAR1212DC series

DC-DC converter

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 11

1 7 1 1 8

1 S Slave address

Wr A Command Code

A 1 7

1 1 8

1

Sr

Slave Address

Rd A LSB

A

8 1 8

1 1 MSB A PEC

No-ack

P

1 7 1 1 8 1 S Slave address

Wr A

Command Code

A

8 1 8 1 8 1

Byte count = N

A

Data 1

A

Data 2

A 8 1 8 1 8 1 1 ……….

A

Data 48

A

PEC

A

P

1 7 1 1 8 1 S Slave address

Wr A

Command Code

A

1 7 1 1 Sr

Slave Address

Rd A 8 1 8 1 8 1

Byte count = N

A

Data 1

A

Data 2

A

8 1 8 1 8 1 1

……….

A

Data 48 A PEC

NoAck

P

Data Byte High

Data Byte Low

Bit 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Exponent (E)

Mantissa (M)

E

MV 2∗=

Command

Hex

Code

Data

Byte

Write

Function

Operation

01 1 W

Output ON/OFF

ON_OFF_config

02 1

Clear_faults

03 0

Clear Status

Write control

Store permanently

Restore_default_all

12 0

Reset defaults

Vout_mode

20 1

Vout constants

Vout_command

21 2 W

Set Vout

Fan_config_1_2

3A 1 W

RPM or duty cycle

Fan_command_1

3B 2 W

Set fan speed

Vout_OV_fault_limit

40 2 W

Set OV fault limit

Vout_OV_fault_response

41 1

Latch only

Vout_OV_warn_limit

42 2 W

Set OV warn limit

W

Latch, restart, folddown

Iout_OC_warn_limit

4A

2

W

Set OC warn limit

W

Set OT fault limit

OT_fault_response

50

1

W

Latch, restart

OT_warn_limit

51

2

W

Set OT warn limit

Status_byte

78 1 Status_word

79 2 Status_Vout

7A 1

Status_Iout

7B 1

Status_input

7C 1 Status_temperature

7D 1 Status_CML

7E 1

Status_mfr_specific

80 1

Read_Vout

8B 2

Read Vout

Read_Iout

8C 2

Read Iout

Read_temperature_1

8D 2

Read Temperature

PMBus revision

98 1 Read fan_speed

90 2

Read speed in RPM

FRU_ID

Mfr_location

9C 4

Mfr_date

9D 6

Mfr_serial

9E

15 Mfr_Vin_min

A0 2

36V (linear format)

Mfr_Vin_max

A1 2

75V (linear format)

Mfr_Iin_max

A2 2

40A (linear format)

Mfr_Pin_max

A3 2

1400W (linear format)

Mfr_Vout_min

A4 2

10V (linear format)

Mfr_Vout_max

A5 2

15V (linear format)

Mfr_Iout_max

A6 2

100A (linear format)

Mfr_Pout_max

A7 2

1200W (linear format)

Mfr_Tambient_max

A8 2

70C (linear format)

Mfr_Tambient_min

A9 2

-10C (linear format)

FRW_revision

D0 1

Fan_duty_cycle_ I2C

D6

1

Duty_cycle read in %

OTF_RECOVERY_I2C

E5 2

Recovery

DCOKHI_ I2C

E6 2

(1/512V)

Standard READ: Up to two bytes of data may follow a READ

request depending on the required data content. Analog data is always transmitted as LSB followed by MSB. PEC is optional and includes the address and data fields.

Data Sheet

PMBusTM Command set:

Block instruction: When writing or reading more than two bytes of

data at a time BLOCK instructions for WRITE and READ commands must be used instead of the Standard Instructions.

Block write format:

Block read format:

Write_protect 10 1 W Store_default_all 11 0 W

Iout_OC_fault_response 47 1

OT_fault_limit 4F 2

Status_fan_1_2 81 1

Linear Data Format The definition is identical to Part II of the

PMBus Specification. All standard PMBus values, with the exception of output voltage related functions, are represented by the linear format described below. Output voltage functions are represented by a 16 bit mantissa. Output voltage has a E=9 constant exponent.

The Linear Data Format is a two byte value with an 11-bit, two’s complement mantissa and a 5-bit, two’s complement exponent or scaling factor, its format is shown below.

The relationship between the Mantissa, Exponent, and Actual Value (V) is given by the following equation:

Where:

V is the value

M is the 11-bit, two’s complement mantissa

E is the 5-bit, two’s complement exponent

Mfr_ID 99 5 Mfr_model 9A 16 Mfr_revision 9B 4

DCOKLO_ I2C E7 2 (1/512V)

hysteresis °C

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 12

Register

Hex

Code

Data

Byte

Function

7

Busy

6

DC_ OFF

5

Output OV Fault

4

Output OC Fault

3

Input UV Fault

2

Temp Fault/warning

1

CML (communication fault)

0

None of Below

7

OV Fault/Warning detected

6

OC Fault/Warning detected

5

Input Fault/Warning

4

Mfr_specific register change

3

nPower_Good

2

Fan Fault or Warning

1

Other fault

0

Unknown

7

Vout OV Fault

6

Vout OV Warning

5

Vout UV Warning

4

Vout UV Fault

3

N/A

2

N/A 1 N/A 0 N/A

7

IOUT OC Fault

6

N/A 5 IOUT OC Warning

4

N/A

3

N/A 2 N/A 1 N/A 0 N/A

7

Vin OV Fault

6

Vin OV Warning

5

Vin UV Warning

4

Vin UV Fault

3

N/A 2 N/A 1 N/A

0

N/A

7

OT Fault

6

OT Warning

5

N/A 4 N/A 3 N/A 2 N/A

1

N/A

0

N /A

7

Invalid/Unsupported Command

6

Invalid/Unsupported Data

5

Packet Error Check Failed

4

Memory Fault Detected

3

Processor Fault Detected

2

Reserved

1

Other Communications Fault

0

Other Memory or Logic Fault

Register

Hex

Code

Data

Byte

Function

7

3.3V_fault

6

OVSD

5

Interrupt

4

Fault detected

3

PS_remote_OFF

2

DC_fault

1

INPUT_fault

0

N/A

Status_fan_1_2

81

7

Fan 1 Fault

6

Fan 2 Fault

5

N/A 4 N/A 3 Fan 1 Speed Overridden

2

Fan 2 Speed Overridden

1

N/A 0 N/A

FUNCTION

DATA BYTE

Unit ON

80

Unit OFF

00

FUNCTION

DATA BYTE

Enable all writes

00

Disable all writes except write_protect

80

Disable all writes except write_protect and OPERATION

DC-DC converter

Status Register Bit Allocation:

Status_Byte [ 0 – normal

1 – fault]

Status_word

(includes

Status_byte)

[ 0 – normal

1 – fault]

Status_Vout

[ 0 – normal

1 – fault]

78

79

7A

Data Sheet

Status_mfr_specific

[ 1 – normal

0 –fault]

[ 0 – normal

1 – fault]

Command Descriptions

Operation (01) : By default the Power supply is turned ON at power

up as long as Power ON/OFF signal pin is active HI. The Operation command is used to turn the Power Supply ON or OFF via the PMBus. The data byte below follows the OPERATION command.

80

Status_temperature

Status_Iout [ 0 – normal

1 – fault]

Status_input

[ 0 – normal

1 – fault]

[ 0 – normal

1 – fault]

Status_cml

[ 0 – normal

1 – fault]

7B

7C

7D

7E

To RESET the power supply cycle the power supply OFF, wait at least 2 seconds, and then turn back ON. All alarms and shutdowns are cleared during a restart.

Clear_faults (03): This command clears all STATUS and FAULT

registers and resets the SMBAlert# line. If a fault still persists after the issuance of the clear_faults

command the specific registers indicating the fault are reset and the SMBAlert# line is activated again.

WRITE_PROTECT register (10): Used to control writing to the PMBus

device. The intent of this command is to provide protection against accidental changes. All supported command parameters may have their parameters read, regardless of the write_protect settings. The contents of this register can be stored to non-volatile memory using the Store_default_code command. The default setting of this register is disable_all_writes except write_protect 0x80h. This default cannot be changed.

Vout_Command (21) : This command is used to change the output

voltage of the power supply. Changing the output voltage should be performed simultaneously to all power supplies operating in parallel using the Global Address (Broadcast) feature. If only a single power supply is instructed to change its output, it may attempt to source all the required power which can cause either a power limit or shutdown condition.

Software programming of output voltage permanently overrides the set point voltage configured by the Vprog signal pin. The program no longer looks at the ‘Vprog pin’ and will not respond to any hardware voltage settings. If power is removed from the µController it will reset itself into its default configuration looking at the Vprog signal for output voltage control. In many applications,

GE

CAR1212DC series

DC-DC converter

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 13

FUNCTION

ACCURACY

Vout_command

± 3%

Vout_OV_fault_limit

± 3%

Iout_OC_warn_limit

± 4% of FL

OT_warn_limit

± 5°C8

± 3%

± 4% of FL

Read_temperature

± 5°C9

the Vprog pin is used for setting initial conditions, if different that the factory setting. Software programming then takes over once I communications are established.

Vout_OV[OT]_fault_limit (40[4F]): Provides the capability to change

the OV[OT] shutdown limit. No sanity check exists to ensure that the changed value is within the expected range. However, if the value exceeds the maximum limit, the program will default to the maximum value.

Vout_OV[OT]_warn_limit (42[51]): OV[OT]_warning is extremely useful because it gives the system controller a heads up that the output voltage/temperature is drifting out of regulation and the power supply is close to shutting down. Preemptive action may be taken before the power supply would shut down and potentially disable the system.

OC and OT_fault_ response (47, 50): The default response for OC is

latched on fault. The response for OT is auto_restart once internal temperatures cool down.

Restart after a latch off: Either of four restart possibilities are

available. The hardware pin Remote ON/OFF may be turned OFF and then ON. The unit may be commanded to restart via i2c through the Operation command by first turning OFF then turning ON . The third way to restart is to remove and reinsert the unit. The fourth way is to turn OFF and then turn ON ac power to the unit. The fifth way is by changing firmware from latch off to restart. Each of these commands must keep the power supply in the OFF state for at least 2 seconds, with the exception of changing to restart.

A power system that is comprised of a number of power supplies could have difficulty restarting after a shutdown event because of the non-synchronized behavior of the individual power supplies. Implementing the latch-off mechanism permits a synchronized restart that guarantees the simultaneous restart of the entire system.

A synchronous restart can be implemented by;

1. Issuing a GLOBAL OFF and then ON command to all power supplies,

2. Toggling Off and then ON the Remote ON/OFF signal

3. Removing and reapplying input commercial power to the entire system.

The power supplies should be turned OFF for at least 20 – 30 seconds in order to discharge all internal bias supplies and reset the soft start circuitry of the individual power supplies.

Auto_restart: Auto-restart is the default configuration for

recovering from over-current and over-temperature shutdowns. An overvoltage shutdown is followed by three attempted restarts,

each restart delayed 1 second, within a 1 minute window. If within the 1 minute window three attempted restarts failed, the unit will latch OFF. If less than 3 shutdowns occur within the 1 minute window then the count for latch OFF resets and the 1 minute window starts all over again.

Status_word (79): returns two bytes of information. The upper byte

bit functionality is tabulated in the Status_word section. The lower byte bit functionality is identical to Status_byte.

Fan_speed (3B): Fan speed can be controlled either by changing the

RPM or duty cycle via register 3B. Selection of RPM or duty cycle control is accomplished by bit 6 of the FAN_CONFIG_1_2 (3A) command. The default mode is xxxx The speed of the fan cannot be reduced below what the power supply requires for its operation. The number represented in register D6 is an unsigned number, it is not in linear format.

Mfr_ID (99): Manufacturer in ASCII – 5 characters maximum,

General Electric – Critical Power represented as, GE-CP

2

C

Data Sheet

Mfr-revision (9B): Total 4 bytes

Each byte is partitioned into high and low nibbles.

Example: FF is read as 16.16 11 is read as 1.1

Series Hardware Rev Primary µC Secondary µC

Mfr_serial (9E): Product serial number includes the manufacturing

date, manufacturing location in up to 15 characters. For example: 13KZ51018193xxx, is decoded as; 13 – year of manufacture, 2013 KZ – manufacturing location, in this case Matamoros 51 – week of manufacture 018193xxx – serial #, mfr choice

note: if the additional xxx space is not utilized then F’s are filled in, (i.e. 018193FFF), ensuring that the actual serial number is clearly identified.

Invalid commands or data: The power supply notifies the MASTER if

a non-supported command has been sent or invalid data has been received. Notification is implemented by setting the appropriate STATUS and ALARM registers and setting the SMBAlert# flag. An invalid command always returns a value of 0 x 00.

Control and Read accuracy:

The estimates below are believed to be reasonable under most operating conditions. However, these are typical numbers and not hard bound values that cannot be exceeded. In most nominal operating conditions the returned values are significantly better than these estimates.

Read_Vout Read_Iout

EEPROM

The microcontroller has 96 bytes of EEPROM memory available for the system host.

Another separate EEPROM IC will provide another 128 bytes of memory with write protect feature.

LEDs

Three LEDs are located on the front faceplate. When the LEDs are ON GREEN then input and output are normal.

When the FAULT_LED is RED, then a fault condition exists and the power supply may not provide output power. The table below further defines these states:

8

Accuracy is estimated near the shutdown point around 100°C. At lower

temperatures the accuracy is much reduced.

9

Accuracy is estimated near the shutdown point around 100°C. At lower

temperatures the accuracy is much reduced.

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 14

1

Normal Operation

Green

OFF

High

2

Low or NO INPUT

OFF

RED

Low

High

DC-DC converter

Alarm Table

LED Indicator Monitoring Signals

Test Condition

3 OVP

4 Over Current

5 Over Temp Fault

Note: Test condition #2 has 2 modules working in parallel. One module is running and the other has no input.

INPUT OK DC OK FAULT FAULT DC OK INPUT OK TEMP OK

Green

OFF

RED

Low Low High High

Low Low High Low

Data Sheet

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

October 21, 2013

Page 15

C7

I2C Address (A0)

C8

Ishare

RED LED (FAULT)

A

C

C1

Outline Drawing

Data Sheet

DC-DC converter

Connector Pin Assignments

Input/Output

Molex P/N: 46437-1041 Mating connector: Molex P/N: 46436-1041

B

Pin Function Pin Function Pin Function Pin Function

A1 Vprog B1 Write Protect (WP) C1 Remote ON/OFF P1 VIN ( + )

A2 PS Present B2 DC OK C2 SDA (I2C bus) P2 VIN ( - ) [return]

A3 OVP Test Point B3 INPUT OK C3 SCL (I2C bus) P3 GND

A4 Fault B4 V

A5 Remote Sense ( + ) B5 SMBAlert (Interrupt) C5 I2C Address (A2) P4 – P6 +12VDC

A6 Temperature OK B6 I Monitor (IMON) C6 I2C Address (A1) P7 – P9 Power Return

A7 N/C B7 V

A8 Remote Sense ( - ) B8 Enable (short pin)

return C4 Vstb return

STDBY

[3.3V]

STDBY

GE

CAR1212DC series

Input: -36V

D C

to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A

PART NUMBER DEFINITION GUIDE EXAMPLE

CAR 12 12 DC x x x Z 01 A

RTM

RoHS Blank – non compliant Y – 5 of 6 compliant Z – 6 of 6 compliant

Options B – bezel R – reverse airflow Vsb = 5

Output Power 08 = 850W

Output voltage 12 = 12Vdc

Type FP – AC; V

o-

positive

DC - DC

A – Standard

model

Data Sheet

DC-DC converter

Ordering Information

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

PRODUCT DESCRIPTION PART NUMBER

1200W converter 12VDC DC-DC converter w/Bezel, 3.3Vaux CAR1212DCBXXZ01A

1200W converter 12VDC DC-DC converter w/Bezel, 5Vaux CAR1212DCBX5Z01A

Contact Us

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

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+91.80.28411633

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