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Using L6564 BCM Flyback controller in Constant Off Time mode instead?

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Thankyou yes, we have seen that App Note....though the datasheet of L6564, (linked in top post) on page 11, shows a wide tolerance on the arming voltage and the triggering voltage, which would result in an uncomfortably wide range of off times for us, if we used that App Note.
 

TLC555 trig input could be used to derive cont off time ... ?
 
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