Go Back   Home > Forums > >

Class D Switching Power Amplifiers and Power D/A conversion

TDA8954 input capacitor
TDA8954 input capacitor
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
Reply
 
Thread Tools
Old 8th July 2016, 09:14 AM   #1
snowcatmaiden is offline snowcatmaiden  Hong Kong
diyAudio Member
 
Join Date: Mar 2009
Default TDA8954 input capacitor

TDA8954 input capacitor-capture-jpg

Don't know much about class D so follow datasheet schematic to start

I wonder if the input capacitors the four 470nf can be omitted
as I don't like the sound of input coupling capacitors (of coz filtering cap cannot be omitted)

and how would it performs if I connect a 3ohm-2ohm speaker,
while the filtering inductor and capacitor values are set to 4-8ohm?
and other way, 16ohm speaker?

Thank you
Attached Images
File Type: jpg Capture.JPG (73.8 KB, 259 views)
  Reply With Quote
Old 8th July 2016, 09:45 AM   #2
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Given this chip sets the inputs to SGND it looks as though the input caps can be omitted but any offset voltage at the input can be expected to be multiplied by the amp gain at the output.

With a lower impedance speaker you run the risk of overcurrent - the current limit is 12A, and depending on supply voltage also overheating. The output filter will be overdamped so you might wish to recalculate the values of the L and C (lower L, higher C). For 16ohms your maximum output power will be significantly limited but you'd need higher L and lower C.
__________________
The whole problem... is that fools and fanatics are always so certain of themselves while wise people are full of doubts. - Bertrand Russell
  Reply to this post

Reply


TDA8954 input capacitorHide this!Advertise here!
Thread Tools

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
TDA8954 output filter riktw Class D 46 10th November 2021 04:23 AM
Input capacitor Triox Solid State 94 11th June 2019 02:57 PM
TAS5630B vs TDA8954 bimbla Class D 14 8th July 2018 02:44 PM
Behringer Sub TDA8954 repair Alexander Baev Class D 12 30th November 2015 08:00 AM
Input Capacitor otherside Chip Amps 26 20th January 2010 04:32 PM


New To Site? Need Help?

All times are GMT. The time now is 08:28 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 13.64%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki