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TPS53819A: schematic check

GARETH OU
Guru 10525 points
Part Number: TPS53819A

Hi 

Could you help check the TPS53819A schematic as below and any need to adjust 

Thanks

TPS53819ARGTR Schematic check.pdf

  • 0
    TI__Expert 5310 points

    Hello,

    One recommendation I would have is to increase the PG pullup to 10kohm consistent with the recommendation in our datasheet:

    I am assuming the PMBus pins are pulled up appropriately with whichever source is driving the communication. If that is the case, no changes need to be made there.

    As far as the output capacitance and inductor selection goes, what is the intended switching frequency for each device? Do you plan to use the 425kHz default?

    Regards,

    Alec Biesterfeld

  • 0 in reply to Alec Biesterfeld
    Guru 10525 points

    Hi Alec

    Thank you very much

    I want to know two configuration:

    1, If we plan to use the default switch frequency 425K HZ, how to change the output capacitance and inductor?

    2, If we plan to use the components of this circuit, how to set the frequency?

  • 0 in reply to GARETH OU
    TI__Expert 5310 points

    Hi Gareth,

    To answer your questions:

    1. Section 7.4.3 of the datasheet details how to size the output capacitance in relation to switching frequency. 

    2. The switching frequency is programmed to NVM by default at 425kHz. You would need to program the FREQUENCY_CONFIG command in order to change this. 

    Regards,

    Alec Biesterfeld