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TPS56C215: About VINripple.

watanabe
Expert 1740 points
Part Number: TPS56C215

Hi,

My customer has a question.

Q2.The calculation formula of input capacitor selection in Datasheet P23(9).

What is Voltage appropriate for VINripple?

Best Regards,

Watanabe

  • 0
    TI__Mastermind 27470 points
    For Vinripple, datasheet under the formula (9) suggests the 40uF input cap. I will strong recommend the input capacitor no less than this value. Under this condition, the input ripple will be around 64mV in 12Vin, 1.2Vo 12A and 153mV in 5Vin , 1.2Vo 12A based on 400Khz switching frequency. In the same time, the RMS current go through each input capacitor should be lower than theirrated value.