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Hi all!!
The ringing you are talking about here is this what I am seeing in my design here, just after the pulse turns off?
If in that case, how do I calculate this gate resistor? I am using an 42.2R now.
Tocotukan
Yes, the PWM_14 waveform is the controller output! I have added some snubber network between the "supply" and the drain of the MOSFET, which only resulted in lower ringing after the turn-off spike happens!
Yes, RAMP is the oscillator ramp and the PWM is the gate voltage at the MOSFET, its the ring just after the turn off I am wondering about. The drain-source voltage over the MOSFET looks like this:
Basically it is the spikes on the oscillator ramp thats worries me. Compared:
Hi all!
I have some problems with ringing in my flyback converter when the MOSFET turns of, see picture.
I'm using an UC1825 equal to the UC3825, running in Current-Mode.
Theories of failure is oscillation in the Voltage Feedback or the Current Feedback, or something else?
I have measured...
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