Help with 10-15W class d amplifier

yasar262 · 6th May 2010, 02:54 PM

Hi Guys,
I really need help for designing my project, which is designing a 10-15w class d amplifier feeding with a battery. I have designed my project with 2 tl082CN for triangular wave oscillator(~125kHz), 1 lm339n comparator , 1 tc4420 and 1 tc4429 gate driver and 2 mosfets(irf23BD..) and an output filter of 20 kHz low pass. I am supplying +-10V to the drain and source of the mosfets and + 5 v for the gate drivers. But unfortunately, I have some heat problems for mosfets ans I could not get the required power. Could you please hel me to solve the problem?

Thanks

81bas · 6th May 2010, 03:48 PM

without complete schematics it will be d@mn hard to help you...

Ouroboros · 7th May 2010, 06:53 AM

5V for the gate driver isn't going to give enough Vgs on the output MOSFETs unless they are logic-level types.

yasar262 · 14th May 2010, 07:31 PM

Sorry for late answer. Here is my design schematic.
design Pictures, design Images, design Photos, design Videos - Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting

savu · 10:55 PM

Quote:

Originally Posted by yasar262

Sorry for late answer. Here is my design schematic.
design Pictures, design Images, design Photos, design Videos - Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting

you don't have level shift, dead time adjust, D1 and D2 are placed in the wrong place, you don't have floating drive to drive the mosfets.

look for a funtional schematic iraudamp for example to get some idea about class D.

Best regards,

yasar262 · 15th May 2010, 08:59 AM

Thank you savu. I have corrected D1 and D2 places. I think TC4420 and 4429 do some level shift. And for the floating drive what do you sugeest?

Regards,

savu · 15th May 2010, 02:40 PM

Hello if you use floating drive like ir2110 you still need level shift. I will post a schematic as soon as i get home

best regards,

yasar262 · 16th May 2010, 03:29 PM

Thank you savu.

regards...

6th May 2010, 02:54 PM	#1
yasar262 diyAudio Member Join Date: Feb 2010	Help with 10-15W class d amplifier Hi Guys, I really need help for designing my project, which is designing a 10-15w class d amplifier feeding with a battery. I have designed my project with 2 tl082CN for triangular wave oscillator(~125kHz), 1 lm339n comparator , 1 tc4420 and 1 tc4429 gate driver and 2 mosfets(irf23BD..) and an output filter of 20 kHz low pass. I am supplying +-10V to the drain and source of the mosfets and + 5 v for the gate drivers. But unfortunately, I have some heat problems for mosfets ans I could not get the required power. Could you please hel me to solve the problem? Thanks

15th May 2010, 02:40 PM	#7
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	Hello if you use floating drive like ir2110 you still need level shift. I will post a schematic as soon as i get home best regards, __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
JLH 10 Watt class A amplifier	tschrama	Solid State	2475	14th May 2012 07:54 PM
JLH 10 Watt class A amplifier #2	DomKo	Solid State	8	30th October 2003 11:32 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

6th May 2010, 03:48 PM	#2
81bas diyAudio Member Join Date: Jan 2006 Location: Kiel	without complete schematics it will be d@mn hard to help you...

7th May 2010, 06:53 AM	#3
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	5V for the gate driver isn't going to give enough Vgs on the output MOSFETs unless they are logic-level types.

14th May 2010, 07:31 PM	#4
yasar262 diyAudio Member Join Date: Feb 2010	Sorry for late answer. Here is my design schematic. design Pictures, design Images, design Photos, design Videos - Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting

15th May 2010, 08:59 AM	#6
yasar262 diyAudio Member Join Date: Feb 2010	Thank you savu. I have corrected D1 and D2 places. I think TC4420 and 4429 do some level shift. And for the floating drive what do you sugeest? Regards,

16th May 2010, 03:29 PM	#8
yasar262 diyAudio Member Join Date: Feb 2010	Thank you savu. regards...

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)