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LM317-N: Input capacitor

Dice-K
Mastermind 6450 points
Part Number: LM317-N

Hi support team,
In the Typical Application item on the first page of the data sheet,
About C1 (input capacitor).

* Needed if device is more than 6 inches from filter capacitors.

Should I place the C1 if the current is small (eg 30mA) but this distance is longer than 6 inches (eg 12 inches)?

Regards,
Dice-K

  • +1
    TI__Genius 12040 points

    Hello Dice,

                      We recommend that an input capacitor (C1) be added if the device input pin is located more than 6 inches away from the power supply source. This will compensate for source voltage impedances and improve line transient performance. Thanks!

    Regards,

    Srikanth