Question
How to calculate the right Capacitor for Qi charging coil?
Dear Forum,
currently I'm implementing a design with the STWLC33 and in the datasheet is a reference design for a coil with L = 8 uH and a C = 3.9 nF. I calculated the resulting resonance frequency and got about f = 90 kHz (with Cser and Cpar). Shouldn't it be something about 125 kHz?
And I also can't use this coil. I have to take a coil with L = 10 uH. Could you please tell me how I have to calculate the needed capacity?
Best regards
Eric
