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TPS61165-Q1: TPS61165TDBVRQ1

Part Number: TPS61165-Q1

用的芯片是TPS61165TDBVRQ1,用来给液晶屏背光供电的,手册规定输入的PWM波频率是5KHz--100KHz,但我们发现,频率高于500Hz时,改变PWM占空比,输出电压无法变化。请问这大概是什么原因?