franticEB
Full Member level 3
Hi i have this circuit on board that doesn't show problems:
then the designers decided to add a 200nF capacitor on cv pin in order to obtain a soft start of pulse signal in input to mosfet.
I noticed a problem: when the -12v (timer is fed with negative voltage) goes to 0 there is a supply hole (50V) of about 20ms as if it were a short circuit.
when the -12v goes to 0 in the same circuit but without the 200nF capacitor there is not problems.
-12V is generated with self-holding circuitry starting from the output of transformer in figure.
Anyone could help me please?
then the designers decided to add a 200nF capacitor on cv pin in order to obtain a soft start of pulse signal in input to mosfet.
I noticed a problem: when the -12v (timer is fed with negative voltage) goes to 0 there is a supply hole (50V) of about 20ms as if it were a short circuit.
when the -12v goes to 0 in the same circuit but without the 200nF capacitor there is not problems.
-12V is generated with self-holding circuitry starting from the output of transformer in figure.
Anyone could help me please?