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TPS54531: Inductor value for TPS54531

Karthik B
Expert 1310 points
Part Number: TPS54531

Dear Team,

From the Inductor value calculation given in the datasheet of TPS54531, I calculated and found out it to be 6.8uH for Vin=12V and Vout=5V,5A 

My concern is what will happen if I use 15uH inductor value instead of 6.8uH inductor?

Similarly for TPS55340PWP regulator also I got inductor value as 6.8uH for Vin =5V and Vout=12V,1.5A....

Can I use 15uH inductor Please suggest.

Please suggest if any drawbacks.

Regards,

Karthik

  • 0
    TI__Mastermind 19080 points
    Hi Karthik,

    I think it should be fine to use a 15uH inductor here, as long as it has enough rated saturate current.

    The drawback in my mind:
    1. Overshoot can be larger with higher inductance when doing load transient.
    2. Inductor with higher inductance has higher DCR. Power loss on the inductor can be higher.

    Regards,
    Sam