My 13x discrete class-D - 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 21st November 2005, 02:44 AM   #1
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Default My 13x discrete class-D

Dear All,

This is my 13x discrete class-d schematic. I works at simulation with no strange although the resistor value seem too small.

Please give me advice for the following problems:

1. My LTSpice have no applicable library for this cicruit.
2. The output voltage is -400mV at zero input.
3. Can the gate mosfet work properly? I am wory about Zener speed.
4. Any ideas for better result?

Please.... and thanks in advance,
kartino
Attached Files
File Type: zip 13xdiscrete.zip (2.6 KB, 149 views)
  Reply With Quote
Old 21st November 2005, 02:46 AM   #2
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
PDF File
Attached Files
File Type: pdf 13xdiscrete.pdf (27.5 KB, 266 views)
  Reply With Quote
Old 21st November 2005, 06:00 AM   #3
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Default Simulation 2V f=1K

This is simulation for 2V input, f=1K
Attached Files
File Type: pdf 13xdiscrete_1k.pdf (34.1 KB, 99 views)
  Reply With Quote
Old 21st November 2005, 06:04 AM   #4
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Default Simulation 2V f=20K

This is simulation for input=2V f=20K,

But again, I have experience with DIY-UCD, that simulation result might be different at real circuit. I blew lot of Mosfet before get better result. Problems such as distortion, heat, stability, etc.
  Reply With Quote
Old 21st November 2005, 06:05 AM   #5
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Default Miss attach

Sorry,

Including on-off gate
Attached Files
File Type: pdf 13xdiscrete_20k.pdf (99.2 KB, 146 views)
  Reply With Quote
Old 21st November 2005, 06:35 AM   #6
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Hello Kartino.

You've gone to some effort here. It nearly works very well.

1. Since they don't have a model of it you need to include it.
Click on edit, click on "Spice Directive", paste this in without the quotes:

".model 2N5551 NPN(Is=2.511f Xti=3 Eg=1.11 Vaf=100 Bf=242.6 Ne=1.249
+ Ise=2.511f Ikf=.3458 Xtb=1.5 Br=3.197 Nc=2 Isc=0 Ikr=0 Rc=1
+ Cjc=4.883p Mjc=.3047 Vjc=.75 Fc=.5 Cje=18.79p Mje=.3416 Vje=.75
+ Tr=1.202n Tf=560p Itf=50m Vtf=5 Xtf=8 Rb=10)
* Fairchild pid=16 case=TO92
* 88-09-07 bam creation"

and then stick it someplace on the schematic.


2. That is too much offset of course. I just played with it for two hours and cant' figure out where it's comming from. I suspect the whole thing to be too susceptible to value and tolerance changes, but this of course has nothing to do with the simulation.

4. That's some pretty original stuff there in some places.. it works OK considering.

Regards,
Chris
  Reply With Quote
Old 21st November 2005, 07:44 AM   #7
kartino is offline kartino  Indonesia
diyAudio Member
 
kartino's Avatar
 
Join Date: Feb 2005
Location: Gunungkidul Indonesia
Hello Chris,

Nice to see you, finally I have my own schematic and my own thread. I like totem-pole PNP/NPN because the driver does not need continous charging, and easy to discharge. That is why I interested to use the type of mosfet driver. I also like simpler circuit, and the discrete feedback class-d amplifier are very simple, but lot of things to play. Every DIY-er can make it.

For 2N5551 is already at library as standard bjt, isn't?

I still have problem for mosfet library, any example to create Spice directive?

Thanks you,
Kartino
  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
My NON-discrete SODFA class-D amp SSassen Class D 134 22nd May 2007 02:51 PM
Noise problems in non discrete class-d amp Baldin Class D 26 18th February 2007 08:00 AM
Discrete Class-D anno 1986 Baldin Class D 11 26th October 2006 07:30 PM
My all discrete prefilter class-D kartino Class D 10 7th August 2006 08:47 AM
recommend discrete Class D rellik Class D 11 3rd November 2005 01:27 AM


New To Site? Need Help?

All times are GMT. The time now is 10:25 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