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

treez · Jul 16, 2020

Hi
Do you know if the attached is a way of doing Constant Off Time control with an L6564 BCM flyback controller?

I am wondering if i've violated something?

L6564 datasheet
https://www.st.com/resource/en/datasheet/l6564.pdf

Easy peasy · Jul 16, 2020

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjQxYCD2dLqAhWQc30KHR8xD1MQFjAAegQIBhAB&url=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fapplication_note%2Fcd00257417-solution-for-designing-a-fixed-offtime-controlled-pfc-preregulator-with-the-l6564-stmicroelectronics.pdf&usg=AOvVaw03456j38RDqnKzOPeU0A85

treez · Jul 17, 2020

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.

Easy peasy · Jul 18, 2020

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

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

treez

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

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