Lateral MOSFET thermal vs others - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 19th March 2009, 12:13 AM   #1
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default Lateral MOSFET thermal vs others

I ran this test today --

Click the image to open in full size.
  Reply With Quote
Old 19th March 2009, 12:59 AM   #2
diyAudio Member
 
Join Date: Sep 2006
This is quite a good result, and shows how stable lateral MOSFETs tend to be with temperature stability. Their Temperature coefficient of Id goes through zero at typically between 100mA and 200mA.

Was this a lone device that you put in an oven, or was it a lateral MOSFET power amplifier?

Cheers,
Bob
  Reply With Quote
Old 19th March 2009, 01:01 PM   #3
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
It was a lone device on a heat sink inside an old amplifier. I used a Tektronix temperature probe as close to the device as possible. The kink in the curve is "operator error", perhaps too much coffee.
  Reply With Quote
Old 20th March 2009, 07:05 PM   #4
diyAudio Member
 
Join Date: Apr 2005
Location: In the Wild, Wild West
When I did AN-1645 and work for AN-1850 (although not shown in the note) I found that the Renesas devices are really stable on bias with temperature. I like these devices for that reason but wish they had more current and power capability. I think I used devices I got from your online store along with the IR devices.

Funny side note, the reason the Magnatec devices are not shown in AN-1850 was because they refused to send me a set for free so I could test them with the LME49830. I had to pay out of my own pocket for the devices used in AN-1645. You'd think a company would like such advertising for less than $50. Bone heads.

-TH
  Reply With Quote
Old 20th March 2009, 09:26 PM   #5
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by SpittinLLama
When I did AN-1645 and work for AN-1850 (although not shown in the note) I found that the Renesas devices are really stable on bias with temperature. I like these devices for that reason but wish they had more current and power capability. I think I used devices I got from your online store along with the IR devices.

Funny side note, the reason the Magnatec devices are not shown in AN-1850 was because they refused to send me a set for free so I could test them with the LME49830. I had to pay out of my own pocket for the devices used in AN-1645. You'd think a company would like such advertising for less than $50. Bone heads.

-TH
You ran it in seconds, to 600 secs, I ran it in minutes.

Right now I have an LM4702 and lateral MOSFET amplifier transmitting at 1.1 MHz -- if I were in Cleveland I could knock Trivasano off the air.
  Reply With Quote
Old 21st March 2009, 12:59 PM   #6
fab is offline fab  Canada
diyAudio Member
 
fab's Avatar
 
Join Date: Mar 2004
Location: Canada
Quote:
Originally posted by SpittinLLama
When I did AN-1645 and work for AN-1850 (although not shown in the note) I found that the Renesas devices are really stable on bias with temperature. I like these devices for that reason but wish they had more current and power capability. ....
-TH
Of course one can use parallel matched devices....but the cost
  Reply With Quote
Old 21st March 2009, 01:20 PM   #7
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by fab


Of course one can use parallel matched devices....but the cost
It's peculiar, but I have found that paralleled matched devices are more stable in operation than singles. I have no "good" idea why this should be the case, but I do have my suspicions.
  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
BUZ901DP lateral mosfet wanted gaborbela Swap Meet 1 8th August 2009 11:50 AM
emulating a lateral mosfet hitsware Solid State 3 11th January 2009 02:53 PM
Lateral MOSFET torture... megajocke Solid State 11 11th November 2007 07:08 AM
Replace IRF by Lateral Mosfet lurker Solid State 12 5th January 2006 09:09 AM
Lateral Structure Mosfet UltimateX86 Solid State 9 16th July 2004 09:50 AM


New To Site? Need Help?

All times are GMT. The time now is 05:44 PM.


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