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384X系列最大占空比问题



384X系列在开环电路中,最大占空比主要是受4脚RC选择的值决定的吧?还有一个就是看到一个电路市电输入电压(未整流)经过电阻分压过来,接到其芯片的4脚,有什么作用?请各位高手帮忙下,不胜感激!