How long for PFC chip to come out of disable?

[eem2am]

Hi,

Do you know how long it takes for the L6562 (=transition mode boost PFC IC) to come out of "disable" and start working normally?

i.e. how long after the ZCD pin is pulled above 350mV does it take for the L6562 to resume full functioning?

(that is, supposing that in the first place, the L6562 had been disabled by a switched on NPN on its ZCD pin (pin5) )

L6562 DATASHEET:
https://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00003316.pdf

 

[Genomerics]

The data sheet indicates that the 'restart current' after disable is the same as that during normal start up conditions.





I would assume that whilst held 'off' the IC will draw similar currents and whilst the circuit is no longer getting VCC supply from the boost inductor there will still be maintenance from the 'bootstrap'..



R4 and R5.

If you can ensure that VCC does not drop below the UVLO turn off threshold, VCCoff, and that requirement would probably be imposed by design then I would expect the circuit to be operational immediately.

That does not mean that your output voltage(s) will be within specification at the same time. The circuit still needs to come back into regulation.

Genome.