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TPS62172-Q1: voltage output below than expected

Part Number: TPS62172-Q1

Hi everyone,

I'm trying to get a regulated voltage of 3,3 volts from a DC line of 16.8 Volts. To do that, I mount the switching regulator (TPS62172QDSGRQ1)  according to figure 32 of datasheet (page 20).

But, I measured 2.6-2.5 Volts in the output rather than 3.3 volts, as expected.

Can anyone help me??

Regards