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Thread: Capacitors??? Need some help...

  1. #1
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    Capacitors??? Need some help...

    Okay, I need some help from the electronics guru's out there....

    I just finished a PSU with the PT5701 and PT6653..... Now according to the TI data sheet on the PT6653 you need a 560uF capacitor on the input line to the PT6653....

    How critical is that capacitance rating???? All I can find locally is a 470uF or a 1000 uF Cap... Will it effect the voltage out?

    Now I could see going lower (470 uF) would be a problem, or maybe it is close enough.... Now going higher (1000 uF) will that be okay?

    Any help would be most appreciated

  2. #2
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    Both 470 uF and 1000 uF are fine - you get slightly more ripple with 470 uF and less ripple with 1000 uF which probably doesn't matter in your application. What's more important is that you use low ESR electrolytics if you can find them.

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    Quote Originally Posted by shchua
    Both 470 uF and 1000 uF are fine - you get slightly more ripple with 470 uF and less ripple with 1000 uF which probably doesn't matter in your application. What's more important is that you use low ESR electrolytics if you can find them.
    Cool, thanks for the info shchua.... can I ask, what determines the capacitance that you use in a given application? Why would TI say 560 uF when 470 uF are so much more common... and yes I realize they are not gearing the DataSheets toward guys who depend on RatShack for parts....

    Just curious, I would really love to comprehend this.

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