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TPS542951 doesn't work

Hi,

I´m trying to use TPS542951. I use the circuit example of the datrasheet. When I tunr the power on and measure the output of the TPS542951, I don´thave the voltage I want, it is nearly zero. I measured the voltage at pin VREG5V, and the voltage is about 1.5V... Do you have any idea of what is going on?

Best Regards,

Miguel