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Output voltage dipping after load is connected

Posted by: Naveeng on

I have attached the schematic.
Output voltage is dipping after i connected the load of 1A also. Can you please let me know where may be the problem.
But without connecting load i am getting regulated output voltage. I have designed for 15.3V output voltage.
Transformer design
Primary = 16 + 16 turns
Secondary = 3 turns
Bias = 4 turns

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IMG_20200124_154616.jpg 3.45 MB

Comments

Submitted by PI-csbabu on 01/30/2020

Hi Naveeng,

Please revisit the schematic once again. C68 supposed to be connected between cathode and ref. The schematic is not clear, where devices D4, R65..etc are connected to optocoupler. Refer to any top switch based application notes for correct schematic or use piexpert online tool .
Regards
csbabu