E48SB9R625NRFB datasheet(8/11 Pages) DELTA

Part #	E48SB9R625NRFB

Description	Delphi Series E48SB, 240W Eighth Brick Bus Converter DC/DC Power Modules: 48Vin, 9.6V/25A out

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Manufacturer	DELTA [Delta Electronics, Inc.]

Direct Link	http://www.deltaww.com

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DESIGN CONSIDERATIONS

Current Sharing

The modules are capable of operating in parallel without

any external current sharing circuitry.

For

a

normal

parallel

operation,

the

following

precautions must be observed:

1. The current sharing accuracy calculation equation is:

Current sharing accuracy=((I load/n)-I)*100%)/I rated

Where, I load=Total load current;

I= Output current of per converter;

Irated=Converter’s rated output current at different Vin;

n=the numberous of parallel modules

2. The maximum load current for N converters is

Imax=(1-X%)*N*Irated.

Where, X% is current sharing load accuracy.

Irated is 100% load for different Vin

This unit has been tested with up to 2 units in

parallel.

3. To ensure a better steady current sharing accuracy,

below design guideline should be followed:

a) The inputs of the converters must be connected to the

same voltage source

b) The PCB trace resistance from Input voltage source to

Vin+ and Vin- of each converter should be as equalize as

possible.

c) The PCB trace resistance from each converter’s

output to the load should be equalized as much as

possible.

4. To ensure a better transient current sharing, and the

monotonic startup of the parallel module

a) The ON/OFF pin of the converters should be

connected together to keep the parallel modules start up

at the approximately same time.

b) The under voltage lockout point will slightly vary from

unit to unit. The dv/dt of the rising edge of the input

source voltage must be greater than 1V/ms to ensure

that the parallel can start up at the approximately same

time.

DS_E48SB9R625_01232007

8

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