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TPS55165-Q1: Schematic review

JH Shin
Guru 10890 points
Part Number: TPS55165-Q1

Hello,

My customer wants TI review of their TPS55165-Q1 circuit design.

Could you please review the following circuit design?

  - VIN = 15.6V ~ 10.7V, VOUT = fixed 12V

Thanks,

JH

  • 0
    TI__Expert 5180 points

    Hi JH,

    thanks for reaching out on E2E. PG pin should be connected to an external 5V power supply or use two divider resistors from 12V output to separate 5V to power PG pin. 

    Also it is recommended to add one or two 0.1uF capacitor at input and output side, which should be placed close to Vin and Vout pin on PCB. other parts seems okay to me.

    BR

    Eric Yue

  • 0 in reply to Eric Yue
    Guru 10890 points

    Hi Eric,

    Thanks for your reply.

    Here is TI webench result for the TPS55165-Q1 under the customer's conditions.

    There is a difference between your recommendation and Webench result.

    Is it correct that PG pin should be connected to an external 5V or use two divider resistors from 12V output ?

    Regards,

    JH

  • 0 in reply to JH Shin
    TI__Expert 5180 points

    Hi JH,

    The design data in Webench may not be very accurate,  it is always recommended to follow datasheet first. So yes, PG pin should be connected to an external 5V or use two divider resistors from 12V output. 

    BR

    Eric Yue