[SI-LIST] : ESR and Q factor

About this list Date view Thread view Subject view Author view

From: Chris Cheng ([email protected])
Date: Thu Sep 21 2000 - 15:08:10 PDT


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

**** To unsubscribe from si-list or si-list-digest: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:29:33 PDT