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TPS22810EVM: Application question (EN with PWM)

Part Number: TPS22810EVM

Tool/software:

Hi Team,

I expect that I can see the 12V output with PWM 50% at 220Hz. But the output waveform is weird. May you let me know why we can't get the output normally and how can we get the desired 50% duty Vout? Thank you.

In addition, when EN = Vin, I can get Vout = 12V DC.

Regards,
Roy