LNK3209 Auto Restart
Hello Team,
I am using LNK3209 to convert from 24Vac to 3.3Vdc. I am driving load upto 500mA. Can you please help me to understand why there is auto restart?
I have attached waveforms for your reference.
Thanks
Sunil
Files
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24V 400mA - 1.png | 288.51 KB |
24V 400mA - 2.png | 289.35 KB |
24V 400mA - 3.png | 341.22 KB |
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C2 is 68uF 100V, R2 is 2.21K. Remaining all components are same as mentioned. I am using this application for low voltage AC input from 18V to 30V.24V is nominal input voltage.
68uF is likely much too small a value for the bulk capacitor at 24 VAC input, and the cap is running down between AC 1/2 cycles. This would have shown up as a problem running the design in PIXLS. You will need a much larger bulk capacitor at such low input voltage - remember that the energy storage scales as V squared.
Try running the design in PIXLS and increasing the bulk capacitor value until the warnings messages go away.
Hi sunil.bhattad,
thank you for using PI-forums.
Can you share with me your schematic diagram so that I could assist you properly? thank you.
have a nice day.
regards,
Sigris