Power isolation without current drop - 24 V DC

Hello Ankur,

Thank you for your post.

Please see TI Home > TI reference designs search

In the search PARAMETER window enter; Vin min 20V, Vin max 28V, Vout 24V, Iout 1A, ISOLATED, 
https://www.ti.com/reference-designs/index.html#search?vinmin=20&vinmax=28&iout=1&vout=24&isolated=Isolated

3 designs meet the criteria.

PMP30524

This reference design provides functional isolation 500 Vrms by simply using a dual inductor from stock. Overall, the design is driven by minimum cost using TPS40210 and adding discrete UVLO. Also, the input range of 1:6 exceeds industrial standard by 7 V to 42 V, which makes this reference design (...)

PMP10856

This reference design provides an isolated 24V/1A output from a 24VAC input.  The supply is laid out on a small 1.1" by 2.4" circuit board, and achieves over 85% peak efficiency.

PMP11047

This reference design provides an isolated 24V/1A output from an 18V-48VDC.  The supply is laid out on a small 1.1" by 2.4" circuit board, and achieves over 90% peak efficiency.

This is how you would do an isolated source for the B Board.
Will this help you?

Thanks for the reply, 

Actually i wanted something like this, i dont want to design a full power supply 

all i need is to just isolate my 24 V without any drop in current,  and that current should be between 2 to 3.2A

Hello Ankur,

Any converter for isolation will have an efficiency loss.
That will subtract from the available total current.
The isolated converter provides a voltage to the load, the load then determines how much current is drawn.

Current will only be limited by:
1. the isolated module current limit function, your board needs 1 Amp so the isolated module should current limit above that.
2. the input source for the main board. The 24V comes from somewhere and its source will determine the total current available.

TI has Isolated DC/DC converters and Modules;
http://www.ti.com/power-management/offline-isolated-dcdc-controllers-converters/isolated-dcdc-converters-modules/overview.html

Isolated Modules may be found here:
http://www.ti.com/power-management/offline-isolated-dcdc-controllers-converters/isolated-dcdc-converters-modules/products.html

TI does not offer a 24V 1A isolated module.
We do provide the means to make your own.