I am getting poor current regulation in non-dimming LNK406.
But when I remove Bias supply resistor it's working fine. I have testes many drivers and decide to remove bias supply resistor from my circuit.
I have read that, this resister supply the IC during dimming or low voltage condition. I have tested that this driver is working fine without this resistor even at 175VAC.
So is it okay to remove bias supply resister from PCB (R4 on attached circuit.) ?
I has also removed SMAJ350A long time ago to extend driver life. Actually this TVS diode shorted in just small spike of voltage and blow up some components like Inductors, Bridge Rectifier & than Fuse.
I have tested my driver in both condition with TVS diode & without TVS Diode.
And than I decide to remove TVS Diode SMAJ350A. After that it's working fine.
Is there any other way for surge protaction ? or I should use SMAJ400A instead of SMAJ350A
attached circuit diagram.
Let me know if PCB layout required.