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TPS23750: Can not get 5V output

Part Number: TPS23750

HI sir,

A customer's design is consistent with the datasheet.

Now the problem is that if D4 is installed in the circuit, there will be no 5V output.

But if D4 is removed, there will be 5.2v output, but Q2 and U1 are seriously hot.

I want to know why.

Any suggestions?

If you need I can send schematic and PCB layout to you.