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dknguyen, would you please , if you have, send other works/books by Rudy Severn.He has recently published one about snubber circuit.
When we would set up snubbers, you pick the cap value based on power dissipation given by P = CV (squared) F. In general, you need to use a non-inductive metal oxide or carbon comp resistor to prevent RFI ringing. These resistors come in 1W, 2W, and 3W ratings. Non inductive wirewound resistors exist but are pricey and do radiate some EMI. Metal oxide are better for snubbers. Stack in series if more power is needed.Please find attached file and help me to calculate the value of capacitor & Resistor for R-C Snubber. For the frequencies of 20KHz & 50KHz. Please also provided a simple formula.