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UCC256402: 应用问题

Part Number: UCC256402

Hi,

Vbulk是前面输入整流过来的母线电压,前级电路无PFC校正正路,直接由整流电路得到, Vin=170-300Vac。

在Vin=290Vac~300Vac的时候,输入电压第一次通电,无输出电压;然后关店再次上电,则输出电压正常,带负载也正常.

在Vin=170-280Vac的时候,不会出现上面的情况,能否帮忙看看,是哪个地方参数设置的不对导致的,谢谢!

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