Hello
I have designed a dc to dc converter in push pull configuration . the problem is that when the input power is about 54 watts the output is about 7 watts. when I studied the wave form , I observed that when the gate drive is off the drain fall to 0Volt for some time. if any one can help we can send u the waveforms or the waveforms are at the link
http://www.maxim-ic.com/app-notes/index.mvp/id/3835

 

If you can attach a detailed schematic here in this post our members can better assist you with your questions.

hgmjr

 

Are the transistors getting very hot?

I'm under the impression that unless you control the current you will run into issues with flux walking (transformer saturation)
http://www.consult-cpr.com/Additional Pages/Eng LinksB7.html

This gives you massive input current without corresponding output current.