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Original question:

TPSM831D31: TPSM831D31 related issues

TPSM831D31: TPSM831D31 related issues

jeno.zhang
Genius 3485 points

Part Number: TPSM831D31

Hello,

DCDC output connection electronic load test, malfunction occurred during the testing process. After power on, the output becomes zero, and the upper computer displays that the input voltage is too low. May I ask what the reason is?

image_1781088875507.png

  • 0
    TI__Expert 8410 points

    Hi Jeno,

    Could you try increasing the current limit on your input voltage supply? Low VIN can occur when the input current is limited, causing input voltage to droop.

    Regards,

    Maha

  • 0 in reply to Maha Noor
    Genius 3485 points

    Hello Maha,

    1. Is it because the input current is too small that the input voltage is pulled down?
    2. previously asked about the buzzing sound emitted by ceramic capacitors. May I ask how to solve this? Are there any specific parameter requirements for using ceramic capacitors?

    Thanks.

  • 0 in reply to jeno.zhang
    TI__Expert 8410 points

    Hi Jeno,

    1. Yes, if the input current limit is too small, the power supply will hit current compliance and pull the voltage down.

    2. Buzzing sounds from ceramic capacitors can be normal. If it is too bothersome, you can try swapping with a larger capacitor.

    Regards,

    Maha