Power GaN FETS now at DigiKey... - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

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
Reply
 
Thread Tools Search this Thread
Old 27th April 2010, 07:34 PM   #21
scolino is offline scolino  United States
diyAudio Member
 
Join Date: Apr 2010
Default EPC GaN FET assembly help

There have been many high density packages released lately, and with demand for increased system density, these packages will become more difficult to use. EPC has recently produced an assembly application note, http://epc-co.com/epc/documents/prod...aNassembly.pdf that discusses bench assembly.
  Reply With Quote
Old 27th April 2010, 07:41 PM   #22
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Quote:
Originally Posted by zhoufang View Post
I'm not sure if I missed something.
The figure 2 (Id vs Vgs) of the document shows great linearity.
If that graph is truly plotted using test data instead of just being an illustration skatch, I think this MOSFet might be great for linear operation too, I.e. Class A/AB amps
A discussion was started in the Pass Labs forum about linear use......

This is some FET !!!
  Reply With Quote
Old 27th April 2010, 11:45 PM   #23
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
Quote:
Originally Posted by scolino View Post
EPC has recently produced an assembly application notethat discusses bench assembly.
Thanks for the link! I hadn't noticed that. They refer to a way of soldering with flux but without solder paste. Might be possible to do it with a homebrew heating setup. Boards would have to be made with a solder mask, but that's not too expensive to have done these days. Tempting... I'll have to read a lot more about class D design before jumping, though.
  Reply With Quote
Old 28th April 2010, 02:05 AM   #24
diyAudio Member
 
Join Date: Nov 2008
Quote:
Originally Posted by theAnonymous1 View Post
A discussion was started in the Pass Labs forum about linear use......

This is some FET !!!
Thank you for the note!
  Reply With Quote
Old 28th April 2010, 02:18 AM   #25
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Portland, Oregon!
Quote:
Originally Posted by zhoufang View Post
I'm not sure if I missed something.
The figure 2 (Id vs Vgs) of the document shows great linearity.
If that graph is truly plotted using test data instead of just being an illustration skatch, I think this MOSFet might be great for linear operation too, I.e. Class A/AB amps
Yeah, but the values in the left column are quite a few Amperes where the graph gets linear (maybe 10 or so). I don't see one of these dissipating a lot of watts in that teeny package like it would have to do for Class A.
  Reply With Quote
Old 29th April 2010, 07:49 AM   #26
iand is offline iand  United Kingdom
diyAudio Member
 
Join Date: Feb 2007
Location: London
Quote:
Originally Posted by ChocoHolic View Post
Well, for class D in the range of some single kW and switching frequencies up to 1 MHz, I could survive with TO-220 and would love TO-252 (D-pack). The resulting inductances can be handled without to much headache.
But the body diodes of Si-MosFets are a torture for my naive soul, and placing a series schottky + additional fast freewheeling is also not charming at all.
Some of the Fairchild 500-600V MOSFETS intended for LCD TVs have trr down to about 50ns.

You need quite a few in parallel but since they cost less than a dollar each this isn't really an issue, and you do get much lower inductance as a bonus.

Ian
  Reply With Quote
Old 29th June 2011, 12:41 AM   #27
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Since EPC has a model for the EPC1011 I did a comparison with the venerable IRFP240:

Click the image to open in full size.
  Reply With Quote
Old 4th July 2011, 03:53 AM   #28
alvaius is offline alvaius  Canada
diyAudio Member
 
Join Date: Feb 2002
Location: Toronto
Pretty cool part. I can certainly see these in my future.

I find the low Vgs pretty exciting especially when coupled with the low gate charge. That makes for an easy and fast logic level driver.

In terms of soldering something like this it is not that hard. You will need a proper PCB of course. Put down a bit of solder paste, put on the part, then sit it on a heat plate. It is not 100% reliable, but with practice you can get fairly reliable results.

Any interest in some TO-220 adapters?

Alvaius
  Reply With Quote
Old 4th July 2011, 09:47 AM   #29
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

Jackinnj Distortion sims donīt show the distortion values for equal currents.
Taking Jacks Vgs-values of 6Vdc the idle currents are 560mA for the EPC1011 and 220mA for the IRFP240.
If the dc-part of the IRFP240s Vgs is corrected for same drain currents, distortion figures read 0.186% for the EPC and 0.132% for the IRFP240 (V6 changed to 8.9Vdc). If the Vgs of the EPC1011 is lowered to 2.1V to give 220mA idle current its distortion values rise to 1.265%.
So I donīt see an improvement here and the EPCs seem to need considerable idle currents to show low distortion behaviour.

jauu
Calvin
  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
new FETs installed, no power. profuse007 Car Audio 29 22nd February 2006 01:22 AM
power supply fets keep blowing Clipped Car Audio 23 22nd January 2006 07:48 AM
Power N channel FETS quasi Swap Meet 0 11th November 2004 11:16 AM
Toshiba power BJTs now at digikey mirlo Parts 8 28th February 2003 08:46 PM


New To Site? Need Help?

All times are GMT. The time now is 09:45 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2