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UC3843: UC3843的CS电流波形不正常

Part Number: UC3843

输入DC12V,输出DC12V0.5A,变压器渣比1:1,感量65UH, 磁芯 EFD20的,砸数28,频率65KHz,带载0.15A时,电流波形是断续的,正常的三角波,一进入连续模式,就有大小波了,就是连续模式波形不正常,请问什么原因UC3842