sorry ,I forgot Eagle schemaic and PCB files
but you can try
print top layer and bottom layer on PHOTO paper using LAzerprinter
then transfer it to duble side copper board torner transfer method
I made SMPS for a car amplifier,
but there is un expectable spike on it
this is the waveform at IDLE
1A load
heavy loads (<3A output)
this is data of my transformer
can u pleas tell me ,what is the reason of that matter.and what do I do to resettle this ,
thank you.
POWER SUPPLY
power output (230W - 270W)
driver - sg3523 SMT(PUsh and pull)
primary switching fet -(2x) IRF3205
core(EI33 PC40)
switching frequency - 100khz
pulse width 45%
working voltage - 9v-16v
output voltage - 36V regulated (unregulated 42V max @13.8v input)
first time turn on - it work fine voltage ok 14.7v, load 4.7ohms
after 30sec - turned it off ,no heat no problem
second time turn on - (load 4.7ohms)
PCB burned AND fused,
2 fet (irf840) burned
three times rebuilt it same result,