|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
|
|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
In Reply to: TL431 noise performance posted by Ola on October 31, 2001 at 00:57:14:
Hi,> TL431 is basically a regulated zener
Hmmmm. The term "programmable zenner" is descritive of the behaviour of the TL431, but not of it's internal function. Saying "programmable zenner" is a nice shorthand way but strictly speaking highly inaccurate.
>and it's said to have a good noise parformance.
It has. It is much better than the LM317 or even LT1085 Series of regulators, it laso has a much wider bandwidth and improved impulse behaviour. Within it's limits it is highly usefull, adding an external power transistor can extend the current range at the cost of spped/bandwidth.
> On the other hand everybody sais that ordinary zeners are
> poor in noise.To say the least. But zenners operate in a totally different mode and are totally different from the TL431, there is no comparison. Basically, any normal Diode can be a "zenner" (if a not so hot one) if you operate it at it's first reverse breakdown treshold. You can make high voltage zenners by selecting normal Diodes for suitable voltages (observe power rating - obviously).
> What about using ordinary zeners as shunt regulators?
Has been done for ages, but results are pretty poor.
> Are the inferior to 317/337?
A normal zenner? Yes, very.
Later T
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: TL431 noise performance - Thorsten 07:16:36 10/31/01 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]