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这个引脚被箝制住,电压回路增益会发生什么改变?
你好,所指的是哪个引脚?
你好,用uc3854A做pfc时,主回路没给电,给芯片上电时16脚没有驱动波形,把芯片换成uc3854后,16脚有驱动波形,当输入电压150V-180VAC时功率校正因数95%+,当输入电压200V AC时功率因数降到90%以下,输出电压290V DC,没有达到设计的390V,输入电压在200V AC之后在增加的话输出直流电压增加比较少,达不到390V DC。这是什么原因呢?