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TPS22969: Inrush Current

Efi Ovadia48
Intellectual 285 points
Part Number: TPS22969

Hello,

I have a question regarding inrush current limiting - does it exist on this component?

My input is 5V, with output capacitance of 500uF. current 1.6A continuous.

Will it be ok?

Can I use the Vout rise time to calculate the inrush?

Tank you,

  • 0
    TI__Genius 13690 points

    Hi,

    Welcome to E2E!

    All the load switches have some level of inrush current control. This is done by having a controlled rise time. Some devices also have adjustable rise times to further manage the amount of inrush current in the system. The TPS22969 does not have adjustable rise time, but the long rise time of the device helps limit the inrush current with heavy load capacitance applications.

    The inrush current can be calculated with the following equation:

    The rise time is measured from 10% of VOUT to 90% of VOUT. With an input voltage of 5V the dV in our will be dV = 4V. The change in time will be the rise time which for this device will be dt = 2663us. Using your load capacitance of 500uF, you could expect an inrush current of about 0.75A. In reality your inrush current should be lower than that since heavier loads(higher output current) will result in a longer rise time. Even with the 0.75A+1.6A the total transient current going through the device would be 2.35A. This is under the 6A current rating of the device, so I don't predict for the inrush current to be a problem for the device.

    Let me know if you have any questions.

    Best regards,

    Andy Robles