Offline BCM flyback using L6564....Bias coil only drives the ZCD pin resistor.

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T

treez

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Hello
We are going to do a BCM Flyback with the L6564 controller. For the ZCD input to the L6564, we will simply have resistors coming off the bias winding and going into the ZCD pin…….we will not be using the bias winding for powering the L6564, therefore there will be no diode and capacitor bank etc….literally just the ZCD resistor going into the ZCD pin.
Do you see a problem with this, and would you recommend an RC snubber across the bias winding?
L6564 controller
https://www.st.com/resource/en/datasheet/l6564.pdf
 

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