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LM1084ISX-3.3/NOPB ripple rejection question

Jericho Li
Prodigy 100 points

Hello,

i have one question for LM1084ISX-3.3/NOPB

if Vin=12V, Vin(ripple)=150mVpp , vout =3.3V ,Iload=5A,  What will be the vout ripple? 

  • 0
    TI__Mastermind 37005 points

    Hi Jericho,

    The PSRR plot in the datasheet provides a good estimate on the attenuation you should expect in your application.
    Once you exceed 3V of headroom (Vin-Vout), the PSRR plot is relatively insensitive to variations in Vin.
    You will need to know the frequency of the ripple to determine your expected attenuation.

    Thanks,

    - Stephen