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TPS54360B: Abnormal output voltage

Part Number: TPS54360B

Tool/software:

Hi Team,

My customer have a question of TPS54360BDDAR, below is their schematic:

The range of input voltage is from 12V to 48V, and the Iout is below 3A.

The two chips in the picture have two output voltage, respectively: 5V and 3.3V. The 3.3V output waveform is as below:

Below is the waveform of SW pin:

The other chip with 5V output that waveform is:

the waveform is unstable and fluctuate from 4V to 6V.

In addition, the voltage of FB pin is 0.8V that is normal.

Could you solve this problem?

BR,

Moon