LDO regulator PCB design question - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 Search this Thread
Old 27th October 2005, 07:06 PM   #1
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
Default LDO regulator PCB design question

The attached image shows 4 variations of a small and simple PCB design for an adjustable LDO regulator such as the LT1084 or LT1085 and would be used to power the smaller Tripath chip amps like the SI, amp3, etc. Can anyone with PCB design experience tell me which layout would be best or how a layout could be improved? The first design only uses the bottom layer (in green). The other three designs use the top layer (red/orange color) for power traces and bottom layer as the ground plane.

I tried to make them as compact as possible not only to keep traces short but because I'd like to house this little fellow in a small chassis with the amplfier. This allows the transformer, rectifier, and filter caps to be situated in their own separate case. The dimensions of the design with the largest ground plane is only 1" by 2". The smaller ones are only 1" by 1.75". The pot allows the output voltage to be adjusted and the small cap right next to the pot is for 120Hz ripple rejection. The smaller bypass caps across the larger bulk caps could be small value ceramics or even MKP or MKT types if the lead spacing is right. No protection diode is necessary with the LT108X regulators for this type of operation so I chose not to include one.

Thanks for any help.
Attached Images
File Type: gif lt1085regpcb.gif (27.4 KB, 178 views)
  Reply With Quote
Old 27th October 2005, 08:04 PM   #2
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
All layouts will probably do but groundplanes looks nicer and give you some addtional reduction of impedance, so use groundplanes!
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 27th October 2005, 09:41 PM   #3
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
Thanks peranders
  Reply With Quote

Reply


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
High Voltage Regulator Design dsavitsk Tubes / Valves 45 21st November 2011 03:05 PM
Voltage Regulator design LM317T 70V to 20V mhamzah3 Power Supplies 4 27th August 2008 09:01 AM
Linear Pass transistor regulator - my design keantoken Power Supplies 49 5th July 2008 10:24 PM
Switching Regulator design Questions fr0st Parts 19 19th November 2007 01:51 PM
Tube Voltage Regulator Design CarlyBoy Tubes / Valves 61 30th October 2006 03:31 PM


New To Site? Need Help?

All times are GMT. The time now is 08:23 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2