Tool/software:
Hi Everyone,
We are having issues using this half-bridge topology. The metrics are 12-36V input and 3.3-28V output with 10A being supplied to the output, but never operating above 200W. I understand that the duty cycle is vastly different across these operating ranges. We have selected several transformers to operate throughout these modes.
My question is that when I have 12V at the input in this half bridge configuration and I have a step-up transformer of 1:2.7, I am having what appears to be avalanching occur on my secondary where my 150V MOSFETs are getting up to 90°C at 2A output and 3.3V. I am not sure how this is happening since that would mean the secondary voltage should only be 16.2V. The controller is completely maxed out in terms of duty cycle. We thought maybe the timing of the synchronous FETs might be the issue so we changed the transformer polarity, however, when we performed this the current through the primary winding was triangular as if it was acting like an inductor.
Any help on things to look at or try would be extremely helpful.
