Input rail voltage for Class D amp? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

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 11th June 2011, 01:31 PM   #1
Join Date: Jun 2011
Default Input rail voltage for Class D amp?


We wish to make a range of SMPS's that amplifier designers can buy from us to power there class D audio Amplifiers.

We are targetting 50W, 100W and 200W.

Please may i ask, what is the typical input rail voltage for a class D audio amplifer?

Or, if not the above, what's the typical range?

Also, what is the required regulation on the rail voltage?
  Reply With Quote
Old 11th June 2011, 08:30 PM   #2
diyAudio Member
nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
Anything from 12 volts up to 90 volts covers most class d amps.

I have stuck to linear supplies basically due to price of SMPS.
Murton-Pike Systems PCBCAD51 pcb design software.
  Reply With Quote
Old 12th June 2011, 12:19 AM   #3
Pafi is offline Pafi  Hungary
diyAudio Member
Join Date: May 2004
Location: Budapest
There are many kinds of ClassD amplifiers with various PSU requirements. Some needs symmetrical voltage with big puffer cap, but needs no regulation, some needs asymmetrical rail with less capacitor, but extremely stable voltage, etc...

For the first type I recommend slightly lower voltage than the typical MOSFET Vdsmax: +/-42 V, +/- 65 V.

For the second type 30...70 V is needed.

And a separate + 12 V 300 mA for gate driver, and other voltage(s) for modulator.

Generally all amplifiers need very high peak power capability compared to nominal value. Double, at least.

Some more requirement:

Hard switching should be avoided, cycle skip mode is even worse.

Idle consumption (of PSU) should stay below 2 %.

Last edited by Pafi; 12th June 2011 at 12:22 AM.
  Reply With Quote


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help fix amp - rail voltage gone crazy manina Car Audio 43 15th March 2012 07:57 PM
F5 loaded rail-to-rail voltage? CanAm Man Pass Labs 40 20th March 2011 07:43 PM
Choosing rail voltage in Class A, Power Follower Amp ervinl Solid State 1 5th August 2010 11:26 AM
Class D rail voltage mod? StriatedFoot Class D 1 27th May 2010 05:06 AM
ad8610 class a bias +v rail or-v rail? crippledchicken Solid State 11 29th April 2004 07:35 AM

New To Site? Need Help?

All times are GMT. The time now is 12:04 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2