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TPS22919: PWM Input on Vin

Part Number: TPS22919

Tool/software:

I am using part tps22919 as a load switch. If ON is low, a 10K resistor pulls VOut Low, disabling the output. If ON is high, I want to pass a PWM signal, around 20KHz, from In (pin 1) to Out (Pin 6). I am seeing that the tps22919 works well with a solid IN, staying at either 3v3 or 5V passes it properly to Out, but with a PWM on In I am only seeing 0V on Out. Is there something I need to change to properly input a PWM signal to In?