I am trying to make a DC DC converter. 36v DC TO 300V DC using uc1875 ZVT PS TOPOLOGY.
uc1875 giving clean waveform when it is working alone with 12v supply and taking 40mA of current
when all the output (OUTA,B,C,and D)connected to the mosfet terminals using a gate driver transformer then also waveforms are ok.
But once i switched on the 36v high power supply all the waveform unstable and got distorted.
I am working in open loop using a signal generator for giving the error signal and only 4 DC gain given in error ampr.
once 36V supply ON. 12v chip supply taking much current between 300ma to 450 ma. and some times over current protection of the 12v supply acting which is set at 700ma.
Attached some waveforms for your reference
