6*lm3886 Bpa - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 14th August 2004, 09:54 PM   #1
Tim__x is offline Tim__x  Canada
diyAudio Member
Join Date: Jun 2004
Location: Edmonton area, Alberta
Question 6*lm3886 Bpa

Here's my idea.
  • Bridged Parallel, 3 IC's an arm. (based on the BPA-200 in the app note)
  • Driving a 4 ohm load. Each arm seeing a 2 ohm load, each IC seeing a 6 ohm load.
  • Running on 30+30 volt rails (unregulated)
  • With DC servo's running on 15+15 volts regulated that will also power the input buffers
  • Each LM3886 running in inverted configuration. (one inverting buffer, one non-inverting)

My math is as follows.


60v-6v(for output dropout) = 54v


13.5amps/3ic's=4.5amps peak per IC. Seems reasonable to me, what do you guys think?

4.5amps(peak per IC)/1.414 ~3.2amps RMS per IC

I haven't done any power dissipation calculations yet, but with 30+30 rails and a 6ohm load I imagine they'll work fine.
Is this doable?
If so, should I make one big PCB or perhaps design one small pcb with just a single LM3886 and a servo on it and make six of them? Either way I'll make the input buffers on a seperate board.

Edit: With a bridged amp is it necessary to connect the main supply caps to ground or just across the rails?
  Reply With Quote
Old 15th August 2004, 04:45 AM   #2
diyAudio Member
Join Date: Aug 2002
Location: Farmington, CT
Send a message via AIM to Mattyo5
BPA-300 :-D Pcb designed!

-Matthew K. Olson
  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
My First LM3886 GC samsagaz Chip Amps 49 29th June 2008 07:55 PM
Psu Lm3886 Mayday Chip Amps 29 29th April 2007 06:10 PM
Lm3886 Bpa Tombson Chip Amps 99 21st August 2006 12:04 PM
Are two separate lm3886 = 2*lm3886 in parallel or bridge mode rs1026 Chip Amps 11 21st October 2004 10:24 AM

New To Site? Need Help?

All times are GMT. The time now is 03:17 PM.

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