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TPS62177 Review please.

Other Parts Discussed in Thread: TPS62177

Circuit problems occurred during testing.

TPS62177 -> Fixed Output : 3.3V/500mA

But 3.3V is not output when configuring following circuit.

In -> 8V, Out -> 1.8V

In -> 12V, Out -> 3.5V

In-> 20V, Out -> 4V

I do not know why.

I need help.