Re: FW: [SI-LIST] : ESR and Q factor

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Fri Sep 22 2000 - 10:44:43 PDT


Yes they do exist. Even in DIgi-Key I saw them. Though not a stock Item all the
time.

Thomas Jackson wrote:

> Where did you get a 10 uF ceramic capacitor. That value seem awfully large
> for ceramic. Are you sure of the value?
>
> Thomas L. Jackson, P.E.
> Staff Product Development Engineer
> Infotainment
> Systems Solutions Group
> FUJITSU MICROELECTRONICS, INC.
> 3545 North First Street
> San Jose, CA 95134-1804
> telephone: (408) 922-9574
> facsimile: (408) 922-9618
> http://www.fujitsumicro.com
>
> -----Original Message-----
> From: Chris Cheng [mailto:chris.cheng@3pardata.com]
> Sent: Thursday, September 21, 2000 3:08 PM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : ESR and Q factor
>
> dear friends,
> this is a strange one. i am using a linear regulator to
> generate 3.3V on one of my board. the app note calls out using
> a 10uf tantalum for output stability. being a simple minded
> person, i decided to use a 10uf ceramic cap instead, thinking
> it has a better esl and esr value. to my surprise, the
> output breaks into huge oscillation. when i switch back to
> using tantalum caps, the output quiet down instantly. the
> same can be achieve if i use a >1 ohm resistor in series
> with the ceramic cap.
> the question is, has anyone experienced similar sensitivity
> in dc linear regulators (the part is lineartech lt1086)? why
> do linear regulator has such sensitivity to q factors ?
> thanks in advanced.
> chris
>
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