What's the purpose of this snubber?
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EMI only or something more?
Best regards, Piotr
- posted
5 years ago
Secondary-side snubber
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- posted
5 years ago
Am 22.08.2018 um 10:36 schrieb Piotr Wyderski:
EMI in first place. Supression of transients caused by reverse recovery of diode and leakage inductance of the transformer.
- Udo
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- posted
5 years ago
Piotr Wyderski wrote
Maybe it damps RF ringing in the transformer a bit, R3 C5 only works at high frequencies, 300 pF, do not know what the switching frequency is. That is a bit in contrast with C8 470 uF that has to have a good ESR for the 300 pF to make much difference, I would then put 100 nF poly in parallel with C8... Maybe it has a shielded output cable? That capacitance would help too.
It R3 C5 does decrease the switching time on the diode a bit too. Yes it will likely radiate a bit less...