HiperPFS: Setting of Brown in/out threshold depends on set value of vout for Boost PFC?
Posted by: treez
on
Hi,
From page 14 of the HiperPFS datasheet it appears (?) that if vout is not set to 385VDC, then the divider to the voltage monitor pin needs adjusting and then this is said to mean a different Brown in and Brown out threshold.
Is this correct? How has the setting of the brown in/brown out threshold got mixed up with the setting of the output voltage?
HiperPFS datasheet:
https://ac-dc.power.com/sites/default/files/product-docs/hiperpfs-3_family_datasheet.pdf
The thresholds for brown- in and brown-out are set inside the IC as fixed functions of the input threshold. If you change the divider ratio on the Vin pin, the brown out and OV set points will move. The IC also uses information from the Vin pin to make adjustments for PF and power limit vs. input voltage. Ideally, the voltage dividers for Vin and Vout should be identical for optimum performance re PF and current limit vs. input voltage. This is all spelled out in the data sheet.