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TPS53355: No voltage at output when converting 12V to 3.3V

Part Number: TPS53355

Hi Experts,

I build a TPS53355 circuit, converting 12V to 3.3V.

The problem is that no voltage at output. I have checked the 12V input power, EN voltage and VREG voltage, all correct. The output loading is about 900mA, no short problem.

The following picture is my circuit according to TI online designer. 

Could you help to suggest how to debug further? what's the potential problem?

Thank you.