I have a specialized LED lighting application that requires:
Power Output Range for various designs: 6-10W
Very high PF: > 0.968
Full range dimming using microcontroller PWM dimming: 0 - 100%
Output Isolation is preferred
Not to mention, I also need a housekeeping supply to operate the microcontroller from.
I have experimented with the LinkSwitch PH and PL devices, implementing some of the designs outlined in the App notes and document DER-263. My conclusion is that I am not going to achieve everything that I want from a Single Stage design. My current plan is to implement a low-power PFC Flyback design with a CV output and use this to operate the microcontroller and also power a separate, discrete CC LED regulator with PWM dimming.
Looking through the available PI devices and applications however, I don't see where any low-power PFC Flyback designs have been implemented other than the LinkSwitch PH and PL designs. I was thinking along the lines of a design using something like the LinkSwitch CV devices.
I suppose I could convert a LinkSwitch PH design to CV operation. I just wonder if there is something that I am overlooking? Has someone actually achieved a LinkSwitch PH design with 0-100% PWM dimming, with an integrated housekeeping supply for microcontroller operation? Can someone give me a pointer for a device or App Note for a low-power PFC Flyback design with CV output?
Thanks in advance