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Ringing Current at the turn off threshold of UC2879

Kok Khuan P'ng
Intellectual 450 points
Other Parts Discussed in Thread: UC2879

Hi TI,

I captured this high ringing current as shown in the attached waveforms at the turn off threshold of UC2879. Channel-1 is the +15V supply while channel-4 is the current of +400V bulk supply going into the bridge Mosfets.

VC, VIN and UVSEL are connected together to a +15V supply.

My question is: 1) Why there is this ringing current  at the turn off threshold of UC2879? 2) How to lower this ringing current or eliminate it?

 

Figure-1

 

Figure-2

 

Figure-3

Figure-3 is the Zoom-in from Figure-2 while Figure-2 is the Zoom-in from Figure-1.

Thank you.

Regards,

Kok Khuan