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TPS560430: How to determine the value of KIND

Hung Ching Hsu
Expert 3086 points
Part Number: TPS560430

Hi Team 

My customer wants to calculate Lmin but formula for Lmin have KIND inside, so customer is asking how can they determine the value of KIND.

Datasheet recommended KIND to be 20%~60%, how can they eventually decide the value?

Datasheet have following description, does it mean customer should decide their desired peak-to-peak ripple current ΔiL first, so they can decide the value of KIND?

"The inductance is based on the desired peak-to-peak ripple current ΔiL ."

"KIND = Ripple ratio of the inductor current (ΔiL / IOUT)"

If yes, then how should customer decide their desired peak-to-peak ripple current ΔiL? Please kindly share it if there's any material explaining about how to decide peak-to-peak ripple current ΔiL.

Following formula to calculate ΔiL also have L inside, so I think it doesn't make sense to use this formula to calculate ΔiL before knowing the value of L.

Thanks.

Regards,

Jo