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TPS7B63-Q1: Output terminal electrolytic capacitor capacity

rui saito
Prodigy 240 points
Part Number: TPS7B63-Q1

Hello,team

Please tell me the negatives to placing a 680uF electrolytic capacitor on the output terminal.
The datasheet says to use a 4.7uF to 500uF electrolytic capacitor.
Will using a capacitor with a large capacity cause an inrush current or a longer charging time,
resulting in abnormal operation of the power supply IC?

Regards,
Saito

  • +1
    TI__Expert 5231 points

    Hi Saito,

    Thank you for your question. Usually when we give a specific range of capacitance it is because moving outside that range can cause a number of issues. Stability, noise, inrush current, startup time, and transient responses are some of the issues that can occur. 

    Adding too large of a capacitance can affect the feedback loop by introducing additional poles and zeros that may cause oscillations to the output. We cannot guarantee stability outside the range of our recommendation. This being said, you could try it and test if the device is functioning as you intended with the given capacitance. 

    Please let me know if you have any further questions, I would be happy to help.

    Thank you,

    Josh Nachassi