TOP258PN - 10W power supply design

Posted by: monil9 on 07/03/2019

Dear sir,

I am designing following power supply

IP dc voltage - 100 to 400V
Single Op Voltage - 350Vdc @30mA

Please find attached my circuit diagram & transformer details.

Problem :

My power supply not starting, it will on and off continuously.

Files

PDF_for_KRP_MULTI_OP_V1.0.pdf (36.07 KB)

transformer_Details.txt (65 位元)

回應

Hi,

Thank you for considering Power Integrations for your solution.

Do you find that the startup problem occurs at all load conditions including no-load? Monitoring the voltage across C49 can help identify if at least the supply voltage is up before AR event

Best Regards,
PI-Kryten

Thank you for your reply,
Yes, it is not staring at any load condition including no load.
I observed the waveform of C49 and it is sawtooth, not smooth dc. I have increased turn ratio of Aux winding but still not starting power supply.

I request you to give all design of 350VDC 30mA including transformer.
so I can complete my project earlier.
I am designing this power supply for an industrial printer.