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TPS54202: Output 0v when enabled

Part Number: TPS54202

Hi,

I am using the TPS54202 to generate 6v 500mA output with a 24v input, I have lefted the EN pin float according to the d/s, and have measured the voltage of EN pin is 4.3v. But the output I get is 0v,  with SW pin 0v and BOOT pin 6.3v.

Why this happens, and what should I do to make it work? Thanks.