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LM22674 LF ripple rejection

Gareth Richards
Intellectual 490 points
Other Parts Discussed in Thread: LM22674

I am proposing to use LM22674 in a design with a high degree (10V p-p) of LF (100Hz) ripple - am I correct to assume that because this is low frequency compared to the switching frequency it will have little effect on the 5V output, at around 0.5A?

  • 0
    TI__Genius 16025 points

    Hi Gareth,

    It sounds like you are putting a full wave bridge with an undersized bulk aluminium capacitor on the front of LM22674. No issue with this application so long as there is at least 4.7uF of ceramic mounted very close to the input of the IC.

    We suggest you breadboard this with an available eval board.

    Thanks,

    Anston

  • 0 in reply to Anston Lobo
    Intellectual 490 points

    Thanks Anston - yes that is essentially the situation - space restrictions do not allow for good smoothing of the raw AC