Regarding LM4780 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 25th October 2014, 10:45 AM   #1
diyAudio Member
Join Date: Sep 2014
Default Regarding LM4780


I am new to Audio Designs.I am using LM4780 in one of our audio project.I need to get 60W Output from each channel and I am operating with 35V DC to get the 60W RMS Output as per the datasheet.

How much load current should I give in Power Supply specifications to get the required 60W RMS Output?

It gave only supply current of 110mA in the datasheet.How to calculate the Load current calculations for LM4780?

How to measure the wattage of the Audio Power amplifier when any audio signal is applied from PC or from any source?With volume changes in file, the current consumption in Regulated Power Supply is also varying.

Is there any instrument to measure the wattage of Audio Power amplifier?

  Reply With Quote
Old 25th October 2014, 11:33 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
The +-35Vdc is the voltage on the supply pins while the amplifier is delivering the maximum power. Check what the datasheet says.
The PSU will have to supply a higher voltage during the quiescent and quiet music/audio state.
Expect at least +-38Vdc as the PSU voltage into the quiescent amplifier to stand a chance of achieving 60W maximum output.
This higher voltage will sag when significant power is delivered. A poor PSU will sag more than a good PSU.

BUT !!!!!
you MUST design your PSU so that it does not go over +-42Vdc, even when the maximum mains supply voltage is right at the top of the suppliers tolerance.
Many countries can achieve a fairly tight +-6% on the nominal supply voltage. Some countries could be around +-10% on the nominal supply voltage.

YOU have to choose your transformer to make sure you don't supply over-voltage to your chipamp.
regards Andrew T.
Sent from my desktop computer using a keyboard
  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
4 x LM4780 mono, OR 2 x LM4780 stereo: Will I notice the difference? mondogenerator Chip Amps 23 1st November 2013 05:40 AM
sonic differences between inverting/non-inverting LM4780 VS both non-inverting LM4780 jarthel Chip Amps 5 19th July 2007 12:37 PM
LM4780 from who? jarre Chip Amps 6 10th August 2006 07:04 AM
lm4780 karma Chip Amps 10 22nd November 2005 07:05 AM
anybody tried a LM4780? travis Chip Amps 162 23rd March 2005 08:14 PM

New To Site? Need Help?

All times are GMT. The time now is 04:21 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2