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TPS5450: Can Aluminum Electrolytic Capacitor be used as input capacitor for TPS5450

Menaka Srinivasan
Intellectual 520 points
Part Number: TPS5450

Hi,

I have selected TPS5450 regulator to get 8V output from 24V input. Can I use Aluminum Electrolytic Capacitor as input capacitor for this regulator?
If yes would you recommend the capacitor - EEE-2AA100UP?
Can someone please clarify.

Awaiting your reply

Thanks.

  • 0
    TI__Expert 3835 points

    Hi Meneka,

    Looks like you posted a couple of threads with the same questions. Please delete them when you can.

    Is this the only capacitor at the input? If so, we do not recommend using an electrolytic cap since the input requires low ESR decoupling capacitors. Usually Al electrolytic capacitors have high ESR which can result in high input voltage ripple which is not ideal.

    Regards,

    Ethan

  • 0 in reply to Ethan T
    Intellectual 520 points

    Hi,

    Thanks for the reply.

    I have planned to use two 4.7uF, 100V ( Part no - CGA6M3X7S2A475K200AB ) and one 2.2uF, 100V ( Part no - C3225X7R2A225K230AB ) ceramic capacitors in parallel due to cost constraint. Would you recommend this combination when input voltage is 24V and the load current is 4A?

    Awaiting your reply

    Thanks

  • 0 in reply to Menaka Srinivasan
    TI__Expert 3835 points

    Hi Meneka,

    I believe this is a better solution and your electrolytic is not necessary. I recommend you looking at section 8.2.2.3 of the datasheet to measure the input ripple voltage of the device. Also make sure that the worse case ripple current is within the ratings of the capacitors.

    One more thing that is good practice is put a high frequency capacitor (around 10 - 100 nF) closest to the Vin pin.

    Regards,

    Ethan