High Voltage to Universal Input Conversion
I'm designing a LED power supply for LEDs based on DER-136 but I need universal input.
What parts of the circuit beyond current limiting and transformer must be changed in order to provide universal input support?
If I want to implement opamp feedback, can I just grab the circuit in DN14 page6 and scale resistor values?
Out: 1.75A,42V.
Comments
I´m interested in any product that can handle 75W, PF > 0.9 and universal input. Since LinkSwitch-PH is newer than TopSwith-GX and this is a new design, I'm quite interested.
EvilPin -
I'm gonna touch bases with the LED group and see what they suggest. Most of them are gone for the day though...so if you can sit tight, I'll get back to you tomorrow.
-The Traveler
What happened? o.o
EvilPin -
Please check your email inbox. I'm going to contact you directly if that's ok.
Regards,
-The Traveler
If you're using DER-136 as your starting point, use the specs from the PI XLS section of the DER report (starts on page 17) as a starting point. You can then adjust your input variables and iterate the design as necessary. There will likely be a bunch of changes: transformer, input cap, feedback components, etc.
Using PI Expert in conjunction with PI XLS might also be helpful as it will help you correctly size your transformer and IC.
I'm a bit bandwidth limited at the moment, so I can't run through all of DN14. From what I remember though, you're mostly going to deal with scaling the resister values to set voltage and current set points.
I'm not sure what your project timeline is like but I believe there is a LinkSwitch-PH part being worked on that targets your power output range. If you're interested in using one of our LED products like LinkSwitch-PH, let me know and I'll do some research to find out what we have that you can work with.
-The Traveler