Dear mr.
I have a problem with bring up of PS , see sch.
Spec. Vin=17-27V, Vout=300V, Pout =400W
Voltage feedback is disconnected by removing R259 for simplification
I'm waiting to see about 50% PWM of MOSFET's control.
But instead I see :GREEN- current U29.8, BLUE & YELLOW is outputs U29.5 and U29.6
Every 200uS packets
After zoom
I see numbers interleaved pulses(with period about 4us, like designed, but small PWM-not 50% ) to gates of power MOSFET
and after I see two not interleaved pulses (at about same time), it produce big current and after about 200us it round robin.
I replace U29, but it still same result .
Same result with/without light load(1.5kOhm)
Please help.
