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LMZ13610: WEBENCH Unstable load step response using sample circuit

Esteban Andrade
Prodigy 50 points

Part Number: LMZ13610

Why is the load step response unstable for the WEBENCH's default sample circuit shown below? is this real? or a bug in the tool?

Vin=28V

Cin=39uF, ESR=25mOhm

Rfbt=5.62kohm, Rfbb=1.07kohm

Cout=3x 270uF, ESR = 8mohm

load steps = 0.5A - 5A

  • 0
    TI__Guru 50120 points

    Hello,

    This looks to be an error in load transient simulation given that the load transient occurs after a delay and load transient voltage simulation doesn't look correct. This is a bug in the tool. 

    If you looked at the datasheet transient response for 12Vin|5Vout|1Ato10A using the LMZ13610EVM you would expect more of the below. The overshoot and undershoot should happen during the load transient rising and falling edge of the load.

    Regards,

    Jimmy