GE Industrial Solutions CAR2548DC User Manual

GE

CAR2548DC series dc-dc converter

Input: -36Vdc to -75Vdc; Output: 48Vdc @ 2500W; 3.3Vdc or 5 Vdc @ 1A

Applications



48Vdc distributed power architectures

 Cellular Base Stations
 Satellite Hubs
 Network Equipment
 Network Attached Storage
 Telecom Access Nodes
 Routers/Switches/ATE Equipment

Features

 3 front panel LEDs: 1-input;2-output; 3 - fault
 Output programmable from 43.2 – 56Vdc
 Remote ON/OFF control of the 48Vdc output
 Remote sense (up to 0.25V) on the 48Vdc output
 No minimum load requirements
 Redundant parallel operation
 Active load sharing (single wire)
 Efficiency: typically 91%
 Standby orderable either as 3.3Vdc or 5Vdc
 Auto recoverable OC & OT protection
 Operating temperature: -10 - 70C

(de-rated above 50C)

 Digital status & control: I
 EN/IEC/UL60950-1 2
 EMI: class B FCC docket 20780 part 15, EN55022
 Meets EN6100 immunity and transient standards
 Shock & vibration: NEBS GR-63-CORE, level 3

Data Sheet

2

C and PMBus serial bus

nd

edition; UL, CSA and VDE

Description

The CAR2548DC series of DC-DC Converters provide highly efficient isolated power from DC input mains in a
compact 1U industry standard form factor in an unprecedented power density of 27W/in
complement the CAR2548FP rectifier providing comprehensive solutions for systems connected either to commercial
ac mains, 48/60Vdc power plants or telecom central offices. This plug and play approach offers significant
advantages since systems can be reconfigured and repositioned readily by simply replacing the power supply. The
high-density, front-to-back airflow is designed for minimal space utilization and is highly expandable for future
growth. The industry standard PMBus compliant I

2

C communications buss offers a full range of control and
monitoring capabilities. The SMBusAlert signal pin alerts customers automatically of any state change within the
power supply.

* 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.

§ Intended for integration into end-user equipment. All the required procedures for CE marking 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.
+ PMBus name and logo are registered trademarks of the System Management Interface Forum (SMIF)

December 6, 2013 ©2013 General Electric Company. All rights reserved.

3

. These converters

GE

Data Sheet

CAR2548DC series dc-dc converters

Input: -36Vdc to -75Vdc; Output: 48Vdc @ 2500W; 3.3Vdc or 5 Vdc @ 1A

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 Vac
Operating Ambient Temperature TA -10 701 °C

Storage Temperature T

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

48Vdc output turned ON -42 -45 -48
Idling Power, 48Vdc output OFF
48Vdc output ON 45
Maximum Input Current (VIN= 37.5Vdc, VO= V
Cold Start Inrush Current (Excluding x-caps, 25C, <10ms,

per ETSI 300-132)
Efficiency (T

=25C, Vin= -48Vdc, V

amb

= 48Vdc); 100% load

out

30 – 50% load
20% load

Holdup time2 (Vin= -48Vdc, V

= 48Vdc, T

out

25C, IO=I

amb

Loss of Output Early Warning Signal T 1 ms
Isolation; Input/Output
Input/Frame 1500
Output/Frame 1000
Input capacitance F 25 µf

48VDC MAIN OUTPUT

Parameter Symbol Min Typ Max Unit

Output power P
Set point, @ 50% load
Overall regulation (load, temperature, aging) -2 +2 %
Linear droop, NL to FL 0.1 VDC
Remote sense (sum of hot & return) 0.25 VDC
Ripple and noise3 500 mV

O, set

, IO=I

O, max

O, max

)

) I

-40 85 °C

stg

-36 -48/60 -75

V

IN

W

I

IN

IN

35

75 ADC

75 A

VDC 48Vdc output turned OFF -36

W

PEAK

90



91

%

87

T 4 ms

1500 V

OUT

0 2500 W

47.5 48.00 48.5 V

V

OUT

DC

V

DC

V

DC

DC

p-p

1

Derated above 50C at 2.5%/C

2

Full load w/5,000µf external output capacitance, Output may droop down to 44Vdc.

3

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

December 6, 2013 ©2013 General Electric Company. All rights reserved. Page 2

GE

Data Sheet

CAR2548DC series dc-dc converters

Input: -36Vdc to -75Vdc; Output: 48Vdc @ 2500W; 3.3Vdc or 5 Vdc @ 1A

48V

MAIN OUTPUT (continued)

DC

Parameter Symbol Min Typ Max Unit

V

Turn-ON overshoot
Turn-ON delay
Remote ON/OFF delay time 40 ms
Turn-ON rise time (10 – 90% of V

) 50 ms

OUT

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

Programmable range (hardware & software) 43.2 56 V
Overvoltage protection, latched4

(recover by cycling OFF/ON via hardware or software)
Output current, V
Power limit, V

= 48Vdc I

out

= 48 to 56V

out

dc

Current limit, Hiccup (programmable level)
Active current share -5 +5 % of FL
External capacitance 0 5,0005 µf

STANDBY OUTPUT

Parameter Symbol Min Typ Max Unit

Set point V
Overall regulation (load, temperature, aging) V

Ripple and noise 50 mVp-p

Output current I

OUT

3 %
2 sec

T

-2 +2 V

V

OUT

58 59 60 V

OUT

P

2500 W

OUT

0 52 A

DC

DC

DC

DC

105 130 % of FL

I

OUT

3.3 / 5.0 V

out

-5 +5 %

out

out

0 1 A

dc

dc

General Specifications

Parameter Min Typ Max Units Notes

Reliability, at 25C
50C

250,000
100,000

Hrs

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

Service Life 10 Yrs Full load, excluding fans

Weight 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 (Needs to be pulled HI via an external resistor)
Logic High (Module ON) I

V

Logic Low (Module OFF) I

V

IH

IH

IL

IL

4

The power supply will attempt three restarts prior to latching the shutdown level.

5

4,000µf electrolytic and 1,000µf tantalum capacitors

0.7V

DD

 

0






20 µA
12 V

DC

1 mA

0.8 VDC

December 6, 2013 ©2013 General Electric Company. All rights reserved. Page 3



GE

Data Sheet

CAR2548DC series dc-dc converters

Input: -36Vdc to -75Vdc; Output: 48Vdc @ 2500W; 3.3Vdc or 5 Vdc @ 1A

Feature Specifications (continued)

Parameter Symbol Min Typ Max Unit

Output Voltage programming (Vprog)
Equation: Vout = 10.8 + (Vprog * 0.96)
Vprog range V
Programmed output voltage range Vo

prog

Voltage adjustment resolution (8-bit A/D) Vo
Output configured to 13.2Vdc V
Output configured to the 12Vdc set-point V

2.5 3.0 VDC

prog

prog

Enable [short pin controlling presence of the 12VDC output]
12V output OFF VI
12V output ON VI
Write protect (Wp)
Write protect enabled VI

Write protect disabled V

I

INPUT-OK (Needs to be pulled HI via an external resistor)
Logic High (Input within normal range) I

V

Logic Low (Input out of range) I

V

OH

OH

OL

OL

DC-OK ( Internally connected to 3.3V via a 10kΩ resistor)
Logic High (Output voltage is present) I

V
Logic Low (Output voltage is not present) I
V

Over Temperature Warning (Needs to be pulled HI via an external

Logic High (temperature within normal range) I

V
Logic Low (temperature is too high) I
V
Delayed shutdown after Logic Low transition T

OH

OH

OL

OL

OH

OH

OL

OL

10 sec

delay

Fault (Needs to be pulled HI via an external resistor)
Logic High (No fault is present) I

V
Logic Low (Fault is present) I

V

OH

OH

OL

OL

PS Present (Needs to be pulled HI via an external resistor)

Logic High (Power supply is not plugged in) IIL
Logic Low (Power supply is present) VIL 0

0

10.8


3.0

0.7V

DD

0

0.7V

DD

0

0.7V

DD

 

0

0.7V

DD

 

0

0.7V

DD

 

0

0.7V

DD

 

0




10

 


























2.5 VDC

13.2 VDC


mVDC

VDC

12 V

DC

0.4 VDC

12 V

0.8 V

DC

DC

20 µA
12 V

DC

20 mA

0.4 VDC

20 µA
12 V

DC

20 mA

0.4 VDC

20 µA
12 V

DC

20 mA

0.4 VDC

20 µA
12 V

DC

20 mA

0.4 VDC

 



4 mA

0.1 VDC

December 6, 2013 ©2013 General Electric Company. All rights reserved. Page 4

GE

Data Sheet

CAR2548DC series dc-dc converters

Input: -36Vdc to -75Vdc; Output: 48Vdc @ 2500W; 3.3Vdc or 5 Vdc @ 1A

Feature Specifications (continued)

Parameter Symbol Min Typ Max Unit

SMBAlert# (Interrupt) (Needs to be pulled HI via an external

Logic High (No Alert - normal) I

V

Logic Low (Alert is set) I

V
Output current monitor (Imon)
Resolution
Accuracy
Measurement range Io 0 52 ADC
Analog output range V
Sourced output current

Digital Interface Specifications

OH

OH

OL

0

OL

0 5.2 VDC

mon

0.7V

DD

 

100 mV/A

-5 5 % of FL

5 mADC






20 µA
12 V

DC

20 mA

0.4 VDC

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
I

measurement range

OUT

I

measurement accuracy 25°C

OUT

V

measurement range

OUT

V

measurement accuracy

OUT

Temp measurement range
Temp measurement accuracy6

IIN measurement range
IIN measurement accuracy

VIN measurement range
VIN measurement accuracy

PIN measurement range
PIN measurement accuracy

Linear

Linear

Linear

Linear

Linear

Linear

tSTRETCH 25 ms

I

RNG

I

ACC

V

OUT(rng)

V

OUT(acc)

Temp

(rng)

Temp

(acc)

I

0 80 ADC

IN(rng)

I

IN(acc)

V

IN(rng)

V

IN(acc)

P

0 3000 W

N(rng)

P

IN(acc)

0 52 A

DC

-3 +3 % of FL

0 60 VDC

-3 +3 %

0 120

-5 +5

C
C

-5 +5 %

0 80 VDC

-3 +3 %

-5 +5 %

Fan Speed measurement range Linear 0 30k RPM
Fan Speed measurement accuracy -5 5 %
Fan speed control range -direct- 0 100 %

6

Temperature accuracy reduces non-linearly with decreasing temperature

December 6, 2013 ©2013 General Electric Company. All rights reserved. Page 5