Full Bridge DC-DC Converter - Closed Loop Compensation

Thread Starter


Joined Nov 13, 2019
Hi everyone,

I'm trying to make a 48V to 400V full bridge dc-dc converter and I'm using SG3525 as pwm IC. The question is; should I apply my 2-pole 2-zero compensation to the error amplifier on sg3525 or build a type-3 compensation on feedback part with tl431. (you can advise another method if you want)

First time I'm trying to make something like that and it confuses my mind so bad. I'll be glad if someone help me about this and I'm also open to all your advices on this work.


Joined Jun 22, 2012
I would use the error amp built in, unless you want to isolate the output from the input supply then an Opto-coupler and TL431 will be needed.

Post your circuit that you think will work..