L6566B Flyback controller in constant frequency mode...how connect ZCD pn?

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For fixed freq, a cap from pin6 to GND is needed, and, pin 12 open circuit or to pin 7 for slope compensation.

" The signal on the ZCD pin in this case is used only for detecting
feedback loop failures (see Section 5.11: OVP block on page 35)."

All this is in the data sheet if you care to read it carefully....
 
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