DER 136 design
Posted by: vinayprasad
on
Hi,
I am evaluating DER 136 design for driving 36 High power LEDs 6 in series & parallel combination. I have developed it as per the standard design. There are a few issues for which i want support to complete the design. Below are the problems.
1. Output voltage = 28Volts No load as against 24V standard.
2. output voltage = 19Volts with load (LED string Voltage).
3. output current 2.8A (oscillating from3.5A to 2.4A).
4. LEDS are flickering.
5. voltage is constant & regulation is also good.
6. PF is 0.9
7 Efficiency is poor 78% as against 85% standard design claims.
Can any body help me to resolve this issue.
Regds,
vinay
Please see the following thread...
http://www.powerint.com/en/forum/power-supply-design/der136-design