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TPS65131: Inductance calculation for 60mA load current

Hisao Uchikoshi
Genius 13550 points
Part Number: TPS65131

Hi Experts,

We are calculating the inductance L1 and L2 based on below formula described on page 13 of the data sheet.

In our usage model, the load current is less than 60mA. If we calculate L1 and L2 with the load current as 60mA, L1 and L2 are calculated as below.

L1 = 45.37uH

L2 = 228.7uH

There is an explanation on page 14 as below.

My question is if we can ignore above inductor recommendation value and can use TPS65131 with light load current as 60mA.

Regards,

Uchikoshi

  • 0
    TI__Expert 6330 points

    Hi,

    I have notified our expert regarding this topic. Please expect a response by 4/23/20.

    Thanks,

    Aaron

  • 0
    TI__Mastermind 18550 points

    Hello Uchikoshi-san,

    4.7uH inductor has been used on the TPS65131EVM and most validation was done with this value at light as well as heavier load. So I would suggest to stay with 4.7uH for both boost and inverting converter but if customer must increase inductance, to perhaps reduce ripple, I would not suggest to go beyond 10uH because higher inductance value will reduce loop stability margin. Customer should measure and ensure that there is enough phase/gain margin for loop stability.

    Kind Regards,

    Liaqat