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LMR16006Y-Q1: Irregular switched output signal

Part Number: LMR16006Y-Q1

Gentlemen,

We have this product which uses LMR16006Y as a converter for a 9-20V input, 3V3 output, which powers Tiva microcontrollers and other devices, adding to around 250mA.

While further evaluating our board, I noted this signal on the SW output from the switcher.

The regular sections show a PWM with 19.4% duty PWM at 2.07MHz, which are reasonable values.

The power net after the inductor seems good and stable at 3.3V, but I wonder if this irregular SW ouput signal is correct? Does that indicate that one of the components is not properly chosen? What would that be?

Regards

Bruno