Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

TDA7296 Power Supply Pins Question
TDA7296 Power Supply Pins Question
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 8th April 2011, 03:06 PM   #1
mrfeedback is offline mrfeedback  Australia
diyAudio Member
mrfeedback's Avatar
Join Date: Feb 2002
Location: Perth, Australia.
Default TDA7296 Power Supply Pins Question

As shown below, the TDA7296 audio amplifier has separate connections for the output stage and input stage power supplies.
Has anybody tried separate supplies and did anybody try regulated supplies for the input stage ?.

Click the image to open in full size.

I believe not to believe in any fixed belief system.
  Reply With Quote
Old 8th April 2011, 05:17 PM   #2
ilimzn is offline ilimzn  Croatia
diyAudio Member
Join Date: Feb 2005
Location: Zagreb
Yes, use the search option.
It is IMPERATIVE that -Vs (pin 8) is always the most negative voltage on the chip, you should NEVER supply -PVs (pin 15) without Vs or the chip will literally explode.
The reason for this is pin 8 is tied to the substrate. The quick fix is to put a schottky diode between pin 8 (anode) and pin 15 (cathode) so that the maximum difference is about 0.4V. Pin 8 can be more negative than pin 15 (within limitations set in the datasheet) but the opposite must always be avoided.
To my ears this chip sounds really good with regulated front end supplies. Using higher front end positive supply (negative is not as relevant due to internal topology) compared to output stage supply also makes it possible to completely omit output bootstrapping. The topology used has higher PSRR from the negative rail so stabilizing the positive front end supply cleans up the output quite a lot. You cannot get the full theoretical power output, but then you cannot do this anyway without the specialapplication circuit from the datasheet, due to limited dissipation of the TDA chip.
  Reply With Quote


TDA7296 Power Supply Pins QuestionHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
sound of TDA7296 and TDA2052 wleediy Chip Amps 1 25th July 2008 08:59 PM
5.1 Stk4044&tda7296 gev Chip Amps 4 12th September 2007 03:36 PM
Help with TP2050 Power Input Pins HolyGhostFire20 Class D 1 28th July 2005 05:36 PM
Power Supply Question RichardJones Tubes / Valves 41 28th April 2003 04:12 PM
power supply question Lacasacorp Pass Labs 0 31st July 2002 01:15 PM

New To Site? Need Help?

All times are GMT. The time now is 05:55 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio