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Original question:

LMR33630: What is the reason for the load scale-up rate?

LMR33630ADDAEVM: SW spikes

Sveinn Jia
Intellectual 2770 points
Part Number: LMR33630ADDAEVM

Hi Team,

I have a question about LM33630EVM.

Why Vin=24V, Vout=5V/3A. SW spikes are small or even none but vin=8V Vout=5V/3A. SW spikes are bigger.

Could you tell me the reason?

B R 

Sveinn

  • +1
    TI__Genius 9980 points

    Hi Sveinn, 

    The switching spike is a natural behavior of switching power supplies. During switching, the PCB parasitic inductance from Vout to Cout, Cout to GND, Cout ESL will ring together with low-side MOS parasitic capacitance. As long as the output ceramic capacitor is placed very close to the IC as below picture, the sw spikes should be OK.

    Thanks,

    Andrew