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push pull design problem

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miladrk

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I made a push-pull converter using sg3525a.

my problem is the output voltage will drop when I connecting 100-watt load or more.

input voltage is 24 volt and the output is 350 volt. the frequency is 100khz. using MOSFET irfp4568. using RC snubber with c=6 nF and R=2.5ohm. and driving the MOSFET with hcpl3120 positive and negative gate voltage. I am using ferrite core EE 55/28/21 to get 1kw output power.
and these are the schematic and PCB Capture1.PNGlead-acid-battery-charger.giflayout.
 

Hi,

you try to test us? ... Whether we recognize that you post a different circuit than you describe..

Klaus
 

I made a mistake. I uploaded a wrong image.
this is the control schematic.
Capture.PNG
 

Hi,

don´t be surprised if nobody spends a lot of time to find out your complete schematic and how the parts are arranged on your PCB...

Klaus
 

output is 1000 W at 350 V, so about 3 A.
input is 24 V 1100 W, for 46 A. note: I added 10% for losses and overhead.

if the output drops at 100W (about 0.3 A), the input is at about 5 A or about 125 W.

how much power can your 24 V source provide?
 

I'd look to how you're abusing that linear regulator,
thermal limit perhaps?
 

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