smps3k

stewin

Member
thanks acca i am waiting. i am planning to use 4 irf740 . and also another question the o.c protection works at what amps or current?
 

Acca

New member
Thank you.
My friend want variable frequency :D
But discrete is much better (because of isolated gate/base drive)
 

stewin

Member
i agree with you , other disadvantages of ic,s are because of fake ones which find their way in the market. by the way does the protection work . as in case of short circuit it completely turns off the smps?
 

Acca

New member
Yes,stupid fakes :)
OCP work with SCR.When SCR trigger,it shut down oscillator and therefore IGBT's or FET's
 

Acca

New member
Sure,but increase gate resistor in parallel with diode in gate to 220R (because IRF740 have smaller capacity)
 

Acca

New member
Hello stewin,did you draw pcb?
I make f meter (finally :) ) and with BJT measure 25kHz with core RIK10 4050 :)
With core from CFL it will be more,maybe 30-35kHz (not measured)
 
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