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Old 6th May 2010, 02:54 PM   #1
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Default 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
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Old 6th May 2010, 03:48 PM   #2
81bas is offline 81bas  Germany
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without complete schematics it will be d@mn hard to help you...
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Old 7th May 2010, 06:53 AM   #3
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5V for the gate driver isn't going to give enough Vgs on the output MOSFETs unless they are logic-level types.
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Old 14th May 2010, 07:31 PM   #4
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Sorry for late answer. Here is my design schematic.
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Old 14th May 2010, 10:41 PM   #5
savu is offline savu  Romania
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Quote:
Originally Posted by yasar262 View Post
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.

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Last edited by savu; 14th May 2010 at 10:55 PM. Reason: mispelling
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Old 15th May 2010, 08:59 AM   #6
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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?

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Old 15th May 2010, 02:40 PM   #7
savu is offline savu  Romania
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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,
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Old 16th May 2010, 03:29 PM   #8
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Thank you savu.

regards...
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