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UCC24624: Input bypass capacitor

Michiaki Tanii
Expert 4650 points
Part Number: UCC24624


Hi team

 

Should customer place the input bypass capacitor for VDD and REG considering DC bias ?

 

Thank you and best regards,

Michiaki

  • 0
    TI__Guru 74115 points

    For VDD and REG capacitor values, please refer to the datasheet recommended operating conditions table on page 5.

  • 0 in reply to Hong Huang
    TI__Expert 4650 points

    Hi Hong,

     

    In the UCC24624EVM-015, C2012X7R1H225M125AC is installed as REG pin bypass capacitor and here is the DC bias characteristic.

    As you can see, actual capacitor value is less than 2.2uF of min CREG in the datasheet.

     

    Shouldn’t customer consider the DC bias characteristic ?

     

    Thank you and best regards,

  • 0 in reply to Michiaki Tanii
    TI__Guru 74115 points

    Yes, the capacitance variation from DC bias should be considered.  C2012X7R1H225M125AC should be ok to use. The min in the recommended table is a typical value for consideration. The EVM shows even using typical min on what the DC bias resulted can still work ok.

    In your design, you can consider to use this capacitor or a bit higher capacitor value along with your temperature range.