大家来说说，三端稳压后用多大的电容合适？

一个好人

前面没有必要太大，有1000UF~~~2200UF够了，后面220UF~~~470UF够了！

xmlhifi

原则上负载电流越大，稳压后电容越大。输出电压越高，稳压后电容越小。一般输出15V的正三端输出电容不超过1000uF，负三端最好先紧跟一个几十uF的高频性能好的电容再接输出滤波，以免低频振荡。输出+-5V的317/337，输出电容上1万uF也正常。

wood2k

一般IC前级都是正负15V的稳压前面我用3300uF或者2200uF，后面用1000uF以下的够用了，要是套件的话，有什么用什么！！！

lhc

三端稳压后电容太大不好
http://bbs.hifidiy.net/viewthrea ... ;page=1#pid15768612

lvl

通常100uf--1000uf

wangrb

317有10uf的薄膜就行了
电解要100uf

xyzsilence

看PDF......

好一个萝卜

学习了

朱倍尔

[quote]原则上负载电流越大，稳压后电容越大。输出电压越高，稳压后电容越小。一般输出15V的正三端输出电容不超过1 ...
xmlhifi 发表于 2012-6-19 20:52 [/quote
    只有版主是正解，低电压和高电流需要大电容，高电压反而不需要那么大的电容。

hughu

拿 不准的，凭感觉用

tieg3023

俺用的1000UF

zhangbodsp

220u就够用了

保10洁

回复 11# yitong

1085的手册也有类似内容。
The circuit design used in the LT1083 family requires the
use of an output capacitor as part of the device frequency
compensation. For all operating conditions, the addition of
a 150μF aluminium electrolytic or a 22μF solid tantalum
on the output will ensure stability. Normally, capacitors
much smaller than this can be used with the LT1083. Many
different types of capacitors with widely varying characteristics
are available. These capacitors differ in capacitor
tolerance (sometimes ranging up to ±100%), equivalent
series resistance, and capacitance temperature coeffi cient.
The 150μF or 22μF values given will ensure stability.
When the adjustment terminal is bypassed to improve the
ripple rejection, the requirement for an output capacitor
increases. The value of 22μF tantalum or 150μF aluminum
covers all cases of bypassing the adjustment terminal.
Without bypassing the adjustment terminal, smaller
capacitors can be used with equally good results and the
table below shows approximately