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TPS54201芯片, 200hz到250hz可以PWM信号调光,但是50Khz的3.3V信号加到PWM管脚没有输出,这可能是什么原因?

Other Parts Discussed in Thread: TPS54201

TPS54201 200hz到250hz可以PWM信号调光,但是在相同占空比的情况下,频率增加,输出电流减小,但是50Khz的3.3VPWM信号加到PWM管脚没有输出,这可能是什么原因?测得在12v输入,接一个白光LED(3v),200hz的pwm信号,输出650mA,效率只有50%,和技术文档的效率也对应不上。请各位专家指导