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TPS22924C: Inrush current can not be avoided if a CIN to CL ratio is less than 10 to 1?

Kazuhiko Hirano
Genius 15118 points
Part Number: TPS22924C
Other Parts Discussed in Thread: TPS22924

Hello,

 

Datasheet 9.3.2 and 10.1.3 say “A CIN to CL ratio of 10 to 1 is recommended for minimizing VIN dip caused by inrush currents during startup”.

I am a bit confused with this sentence.

TPS22924C should control Slew Rate to Avoid Inrush Currents.

But if a CIN to CL ratio is less than 10 to 1, TPS22924 might not be able to avoid inrush current and Vin could drop?

 

Best regards,

 

K.Hirano

  • 0
    TI__Mastermind 32650 points

    Hirano-san,

    This recommendation is not made for protection of the device or downstream loads but rather in the case where the supply is weak. 

    If a stronger supply is used, then a larger input capacitor is not needed as the supply will be able to provide the inrush current. As you noted, this will only happen in the case that the slew rate not long enough to fill up a larger output cap.