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最近在用UCC28070做500W APFC,发现仅有一相启动,另外一相没有PWM,CSA脚有4V左右电压使该路驱动信号过流关闭,但始终没有找到过流的原因,即使把这路完全断开仍有过流信号产生,这到底是什么原因呢？ 问了别人说是该芯片在轻载时只有一相工作,是否有这个功能,PDF上没有说明,希望各位解答一下小弟的疑问。
