Replacement for 10M45 / CCS - 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 6th October 2012, 07:13 PM   #1
diyAudio Member
 
Join Date: Apr 2012
Location: Oslo, Norway
Default Replacement for 10M45 / CCS

Hi,
is there an alternative for this IC since i have trouble locating an european distributor?

To built i it with discrete elements would be fine for me, too
  Reply With Quote
Old 6th October 2012, 07:49 PM   #2
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Its no true IC, just a depletion mode MOSFET that you can set its IDSS just like a JFET. Supertex DN2540 is analogous, bit better spec actually.
  Reply With Quote
Old 13th October 2012, 09:42 AM   #3
diyAudio Member
 
Join Date: Apr 2012
Location: Oslo, Norway
hmm, same problem. hard to source for me here in norway. please, could anybody boint me to some reading about this kind of CCS?

seems that a lot of power MOSFET-types could work, but the datasheets are full of slightly divergent characteristics, so i don`t know what to look after.

thanks for any input, harry
  Reply With Quote
Old 13th October 2012, 10:48 AM   #4
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Ebay is full but a bit of a rip off pricing there.

"Sources 101, Part 2", page 3.
Services
  Reply With Quote
Old 12th November 2012, 04:01 AM   #5
roger57 is offline roger57  Canada
diyAudio Member
 
roger57's Avatar
 
Join Date: Sep 2006
Location: Edmonton, Alberta
Default How does this CCS Operate?

Hi,

Can anyone tell me (or redirect me to a better forum?) how this circuit operates? (the DN2540's in the cathodes of the E88CC LTP)

http://richardsears1.files.wordpress...pp-amp-sch.jpg

I'm at a loss to understand how the gates get enough drive voltage to enable the FETs. In LTSpice, I've tried it in the cathodes of a 6SN7 LTP and couldn't get it to work. Used the supertex.lib model.
  Reply With Quote
Old 12th November 2012, 04:11 AM   #6
GaryB is offline GaryB  United States
diyAudio Member
 
Join Date: Sep 2002
Location: Silicon Valley
Quote:
Originally Posted by hugenh View Post
Hi,
is there an alternative for this IC since i have trouble locating an european distributor?

To built i it with discrete elements would be fine for me, too
Have you looked here?
10M45 at Mouser

---Gary
  Reply With Quote
Old 12th November 2012, 05:01 AM   #7
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
normal enhancement mode MOSFET require added source of voltage for gate

Welcome to Gary Pimm's DIY Page shows a couple of ccs options

depletion mode MOSFET can work like JFET ccs with source R setting current but there are few part # made
  Reply With Quote
Old 12th November 2012, 02:06 PM   #8
roger57 is offline roger57  Canada
diyAudio Member
 
roger57's Avatar
 
Join Date: Sep 2006
Location: Edmonton, Alberta
Quote:
Originally Posted by jcx View Post
normal enhancement mode MOSFET require added source of voltage for gate

Welcome to Gary Pimm's DIY Page shows a couple of ccs options

depletion mode MOSFET can work like JFET ccs with source R setting current but there are few part # made
Hi,

Thanks for your response. BTW - the DN2540 is a depletion mode mosfet.

However, has anyone actually looked at this schematic? There are no external connection points for gate drive. It doesn't appear that anything is required.
So I'm back to the question, will this circuit work, if not, what's needed to make it work? Has anyone successfully used this in a long tail pair? Has anyone successfully modeled this in LTSpice?

I'd be happy to plop this question in another forum if this one's not OK for this, and a moderator could tell me which one.

Thanks,
Gary
  Reply With Quote
Old 12th November 2012, 03:49 PM   #9
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Works like a Jfet cascode cathodes sink ccs. The lower semi is in idss mode while the upper one provides vds to it by means of spanning it with its vgs.
  Reply With Quote
Old 12th November 2012, 04:02 PM   #10
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
N type (only type available for MOSFET) depletion mode devcies conduct Idss with Vgs=0, are progressively cutoff by Vgate lower than Vs

the Vgate "comes from" the current flowing in the R in series with the source - allows selecting an operating current that is < Idss

as pointed out this is the same as N jfet ccs, CRD

Quote:
Originally Posted by jcx View Post
http://liveweb.archive.org/http://ww...0596/70596.pdf

those intersted will probably want all of the Siliconix app notes: JFETs Application notes
  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
IXYS 10M45 CCS IC question zobsky Tubes / Valves 19 26th July 2008 08:15 PM
CCS 10M45 in Cathode of CF Driver danFrank Tubes / Valves 13 5th March 2007 09:41 PM
IXYS 10M45 chip CCS Alastair E Tubes / Valves 3 31st December 2006 12:45 PM
Wanted IXYS 10M45 guglielmope Swap Meet 0 29th June 2006 08:10 AM
10M45 CCS, what am I doing wrong ? jj2 Tubes / Valves 7 16th April 2006 01:54 AM


New To Site? Need Help?

All times are GMT. The time now is 09:15 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