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Class D Switching Power Amplifiers and Power D/A conversion

Class D amplifier need schematic
Class D amplifier need schematic
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Old 21st November 2010, 12:09 PM   #1
DJtosa2 is offline DJtosa2  Serbia
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Default Class D amplifier need schematic

Hello everyone, I am totaly new in Class D amplifiers, and I really want to bild D amplifier, something simple around 300-400W on 4 ohm load, without protection, really simple with ir2010, ir2110, irfp260, irf460 on example

I learned something on this forum obout D amp, but i need more )

P.S Sorry for new thread, my english is really bad
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Old 21st November 2010, 04:44 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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I would go for a IRS2092 design but beware of its touchy protection.
Decouple the IC and MOSFETs really well.
Keep the pcb layout very tight and loads of copper where you can.
Use IRFB4019 mosfets as these are low capacitance while still allowing 17 amps but use full deadtime.

I built one and was gobsmacked by its very wide bandwidth.
From very low to very high frequencies it was very good.
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Last edited by nigelwright7557; 21st November 2010 at 04:48 PM.
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Old 21st November 2010, 04:47 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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I built a discrete class d amp of my own design.

It sounded ok but without extra circuitry it gives off a huge burst of noise as the oscillator runs down on power down !
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Old 21st November 2010, 05:54 PM   #4
DJtosa2 is offline DJtosa2  Serbia
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Look this, I was created few minutes ago. I want IR2110 and IRFP460 or IRFP260 because I already have this IC and power mosfets..

I looked the datasheets and examples of other people for IR2110 and I think that shematic is corect, can you chack this?

I dont have an idea for comparator (pin 10 and 12 of IR2110)!? I have shematic with TL071 and LT1016, but this LT is very expensive in my town, have you some other proposition, something simple and good?

I cretade PCB only for this what i have, it's small. Capacitors od 1000uF and 100nF of power rails are very close to power mosefets. everuthing is very close, but nice deployed and i think will be functionally.

which voltage do I need for 300 350W, i think +-60-65V, is this corect (like AB class or diferent)

Thanks and regards
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File Type: png shematic IR2110.png (35.4 KB, 892 views)
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Old 21st November 2010, 08:14 PM   #5
gogowatch is offline gogowatch  Hong Kong
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You need to bootstrap the 330nF cap from V+ through a resistor and diode during start up.

Cheers,
WK
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Old 21st November 2010, 08:52 PM   #6
Pafi is offline Pafi  Hungary
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DJtosa2!

12V and 5V must be referenced to negative power supply rail! 12V must be decoupled by a good capacitor (for example 1 uF X7R), 5V is not really sensitive (there is almost no current). 100 ohm is toooo much for Rg. Forget IRFP460! IRFP260 is not a very good choice either, but can work.

GND pin of gate driver must be connected directly to source of low side FET!

Last edited by Pafi; 21st November 2010 at 09:07 PM.
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Old 21st November 2010, 09:04 PM   #7
nigelwright7557 is offline nigelwright7557  United Kingdom
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A comparator is needed to compare teh audio signal and the triangular wave.
This then feed into a pair of 4070 XOR gates to split the phase of the comparator output. these two signal then go into LIN and HIN on the 2110.
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Old 22nd November 2010, 01:34 AM   #8
DJtosa2 is offline DJtosa2  Serbia
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Ok, thank you all for replay

I changed some elements, but i don't understand all because my english is very bad (only classes in high school)

I removed 5V, pin 9 is also on +12V referenced to negativ supplay. I will add didoes between gate and out befor L for positive transistor and diode between gate and negativ rail for negativ transistor (1n4744). I dont understand that about bootsrap capacitor 330n, resistor and diode and gnd directly to what ??? Sorry again

Wich transitor and voltage can use

Can anyone draw corect schematic for changes, sugestions on my schematic because i dont understand what sholud i do, I would be very grateful!

Again,thank you all. Regards
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Old 22nd November 2010, 09:03 AM   #9
luka is offline luka  Slovenia
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Class D amplifier need schematic
Quote:
Originally Posted by nigelwright7557 View Post
I would go for a IRS2092 design but beware of its touchy protection.
I have seen this being writen 100 times, I had no problems, calculated right for my fets and that about it, never a problem
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Old 22nd November 2010, 11:48 AM   #10
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by luka View Post
I have seen this being writen 100 times, I had no problems, calculated right for my fets and that about it, never a problem
I followed the datasheet to the letter yet it still just clicked permanently.

In the end the problem turned out to be the 10uf on the vcc rail.
I was getting glitches on the vcc line that put the 2092 into protection mode.
I put in a 47uF and that sorted the problem out.

One of the main problems I have spotted is many people want to use different mosfets and this is a minefield.
I eventually found the irfb4019 and this is a proper class d mosfet and that worked great and didnt cook the 2092 due to high capacitance.
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Last edited by nigelwright7557; 22nd November 2010 at 11:50 AM.
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