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Our customer consider to use UCC24636 with Low-Side SR Configuration.
Please see attched waveform.2541.waveform.xlsx
1.Is this waveform normal .?
2.Can they extend DRV ON time ? Please let us know how to extend DRV ON time.
3.If DRV ON timing and resonance timing overlap is, does this cause any problem ?
Hi Kura,
The waveform looks of for me . if you check the datasheet page 11 Figure13 , you will see there is also a short time SR body diode conduction before the SR current to zero. this time is necessary for safety operation of SR . If DRV ON time overlap with resonance timing , on one hand it will lead to reverse current and SR voltage stress is high when it turn off . on other hand, it may lead to shoot through if the power stage is operation at CRM mode.
At the end of SR conduction , the current is small , so even extend the conduction time , limit benefit for efficiency.
Thanks.