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TPS51285B: Schematic review

Part Number: TPS51285B

Hi Expert,

Could you help to review the schematic for TPS51285B, this is Compal Dell NB project.

KingDa Ka 3V5V_TPS51285B_0419.pdf


  • Hi Far,

    I will check and give you feedback tomorrow at the latest. Thanks.


  • Hi Far,

    My suggestions are shown below:

    1. A 100nF high-frequency capacitor needs to be added to the input side and placed close to the Vin pin of the chip.

    2. The 10uF input capacitor used by the customer has a voltage resistance of 25V. Due to the piezoelectric effect of ceramic capacitors, the effective capacitance will drop significantly at an input voltage of 20V. It is recommended that customers increase the input capacitance or adjust the withstand voltage to 35V.

    3. Change PL901 to 1uH. Change PL902 to 2.2uH

    4. Driver resistors can be added to facilitate later debugging

    5. Please also add a high-frequency capacitor (100nF) to the output side

    6. Change PR906 to 8.2kohm, change PR907 to 6.19kohm.