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TPS54521: Problem with 100% duty cycle in TPS54521

Part Number: TPS54521

Hi,

But in my circuit if input voltage drops below 5.3V, Output voltage is going to completly turn off. After hiccup cycle period its againg turn on. This cycle is continuously happen. Its not follow Vin. Iout is 1A.

IC is not getting hot.

Is there any mistack in my circuit desing?

In scope Yellow channel is Output voltage and Blue channel is voltage accros low side mosfet(PH to GND pin).