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TPS25831-Q1: The output is unstable and the temperature is too high.

user5977407
Intellectual 290 points

Part Number: TPS25831-Q1

1: output is SW output is unstable 

2: PCBA temperature is too high

3: in full load 3.1A, the output will up to 5.5V.

  • 0
    TI__Expert 8420 points

    Hi ,

    Thanks for your questions on tps25831. 

    Pls. find my comment as below: 

    1: output is SW output is unstable --> The device have the switching frequency support  spread spectrum function, this is  why you found in the test waveform . This feature is good for EMC performance.

    2: PCBA temperature is too high--> how many T case temperature you have measure ?  This device have a big thermal PAD in the bottom of the device , so it will help  heat dissipated .

    3: in full load 3.1A, the output will up to 5.5V.--> This device has Vout calbe drop compensation. If you don't need this function you can set the Rmon resistor to Oohm , then the Vout will not come up as the current increase.