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TPS53515: R-C Time Constant

Part Number: TPS53515

Hi,

We got a question from the customer about TPS53515.
Could you help us?

[Question]
- They are considering using the IC under the following conditions. Which is the best R-C time constant in thier condition, 40us or 80us?

  Vin=12V
  Vout=5V
  Iout=5A max
  fsw=750kHz
  L=2.2uH
  Cout=139uF (EMZA160ADA101MF61G*1pcs, GRM31CB31C226KE15L*3pcs) *considering DC bias effect
  FCCM Mode

Best Regards,
tateo