Help, improvement class D

mgm2000ro · 27th June 2010, 09:26 AM

Hello, this is a diagram of an car amplifier.
I want to make some changes to improve this scheme, the high size is hot (60-70 degrees on transistor without heatsink ) without loud on the output
What changes do suggest, please draw on the diagram.
Thanks in advance !

Pafi · 02:11 PM

R191 is huge, and you should have drive upper gate with higher voltage then source voltage, and source voltage has to reach Vpp!

Learn from UcD!

mgm2000ro · 02:43 PM

My mistake, in schematic of this amplifer are many mistakes.
I think this is the right !
Thx Pafi !
I do not like waveform on final mosfet, what changes need to bring for a good waveform for the final mosfet

AP2 · 27th June 2010, 03:51 PM

Hi,after see scheme,carrier freq. and 12Kpf of gate driving for side.
not is possible simple modify (my opinion).
only hard modify I think. change operational,remove pair of BJT driver and replace it with 4xtc4426 chip. this can driver a pair of mosfet for solve current necessary of gate.

Pafi · 27th June 2010, 03:55 PM

Try to remove some MOSFETs, and decrease R191!

mgm2000ro · 27th June 2010, 04:06 PM

Thank you very much, Pafi & AP2, i will return with some pictures.

AP2 · 27th June 2010, 04:17 PM

Hi,
for precision is TC4427 (non inverting).
very simple change with it. 2 for side and...FLY.

Pafi · 27th June 2010, 07:48 PM

Sorry for OFF!

AP2! Please tell me you are learning english!

AP2 · 28th June 2010, 06:03 AM

Quote:

Originally Posted by Pafi

Sorry for OFF!

AP2! Please tell me you are learning english!

now I speak perfect English.
I mean it is easy to replace the driver stage with TC4427 (2 x side).

27th June 2010, 02:06 PM	#2
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	R191 is huge, and you should have drive upper gate with higher voltage then source voltage, and source voltage has to reach Vpp! Learn from UcD! Last edited by Pafi; 27th June 2010 at 02:11 PM.

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27th June 2010, 03:51 PM	#4
AP2 diyAudio Member Join Date: Dec 2009 Location: Italy	Hi,after see scheme,carrier freq. and 12Kpf of gate driving for side. not is possible simple modify (my opinion). only hard modify I think. change operational,remove pair of BJT driver and replace it with 4xtc4426 chip. this can driver a pair of mosfet for solve current necessary of gate.

27th June 2010, 03:55 PM	#5
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	Try to remove some MOSFETs, and decrease R191!

27th June 2010, 04:06 PM	#6
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	Thank you very much, Pafi & AP2, i will return with some pictures.

27th June 2010, 04:17 PM	#7
AP2 diyAudio Member Join Date: Dec 2009 Location: Italy	Hi, for precision is TC4427 (non inverting). very simple change with it. 2 for side and...FLY.

27th June 2010, 07:48 PM	#8
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	Sorry for OFF! AP2! Please tell me you are learning english!

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