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TPS548B22: Schematic Review Request for TPS548b22

Feng bin Su
Expert 8690 points
Part Number: TPS548B22

Hi team,

My customer is using our TPS548B22 and the schematic is as below.

I have checked it and would like to have your double confirm.

Would you have any suggestion about it? Thanks.

  • 0
    TI__Guru 56795 points

     

    Generally the schematic looks very good.  A couple of minor things that I would suggest for improvement.

    1) For a 12V input, I would recommend increasing R9918 from 1-ohm to 10-ohms.  VDD does not need to be the same voltage as PVIN and increasing the filter resistor will help reduce the noise on the VDD pin.

    2) I calculate that meeting the 1ms soft-start time will require at least 6A of output current during start-up due to the combination of high output voltage and output capacitance.  This is well within the TPS548B22's capabilities if the ouptut load is limited, but it's a fairly large amount of no-load current if the 1ms soft-start time is not critically needed.

  • 0
    TI__Expert 5310 points

    Hello,

    I reviewed the schematic and the selection of components is good for a 12Vin to 3.75V design. I verified the component selection using our device calculator and the selection if balanced for performance. One suggestion I may have is to include a 0 ohm resistor in series with the RSN pin to allow the layout to include a differential sense tied to the point of load. The soft-start time is fast given the amount of output capacitance and output voltage, but the customer can support a startup into a load of 23.6A given the current limit and current needed to charge the output capacitors upon startup. Please reach out to me regarding any further questions.

    Sincerely,

    Alec Biesterfeld,