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PWM给多大的频率，除了给输入电源，还要接那几根给输入信号
Hi TPS92641 devices can be programmed for switching frequencies ranging from the tens of kHz to over 1 MHz.
但实际推荐工作频率范围200kHz~600kHz.
除了供电，如果要调光，还要调光信号（具体都可以看datasheet）
