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Webench/LMZ14203H: Input Peak Current

Roger Hendrick
Prodigy 20 points
Part Number: LMZ14203H

Tool/software: Webench

Hi every one

In the result of Webench with LMZ14203H, declare Max Average Input Current as 1.2A.

but i would like to know amount of instantaneous peak input current and would like to know may input current exceed the max input current temporary?

my design spec. is as below:

Vin: 28 to 33V

Vout: 10V

Max Output Current: 3A

  • 0
    TI__Intellectual 2360 points

    Hi Roger,

    The average input current is essentially the average of a sloped pulse train.  Ignoring the averaging function of the input capacitor Cin, the peak of that sloped pulse is the same as the peak switch current, which for your design is about 3.7A (at your maximum 3A output current). 

    You may see the input current vs. time by running the online electrical simulation for "steady-state" , then showing the Iin (input current) probe signal.   The input transient simulation may also be interesting to look at, as momentarily during the transient the input current will be much higher than in steady state. This peak current value is related to the transition rate of the input voltage and the size/parasitics of the input capacitor.  The behavior is generally common to buck regulators.

  • 0 in reply to Wanda Garrett - WEBENCH Design Center
    Prodigy 20 points

    Thanks for sharing your  experience