DIY Good Class D amplifier

[Acca]

I can say what I thought,
For a 'correct' dead time, you need need a digital circuit, as they did here with gates A1,A2 :
http://geekcircuits.com/wp-content/uploads/2010/07/tl494-class-d-power-amp1.png
Because the signal is too weak, after these gates, you need a MOSFET driver (IR2010).

Yes,but you will see 27R in gates,which provide another dead time

 

[aman khalsa]

Simple Class D for begginers,version 2 (better),with pcb :

hello sir , i want to use this amp in my car for sub .. is this amp work direct on 12v dc ??

 

[Acca]

Hello,on this page here's a better designs.On 12V you get about 4W on 4 ohm only.

 

[stewin]

hi aman .try and make a step up inverter to increase the amp power supply so as to attain high wattage.

 

[aman khalsa]

@acca ----- ok thank u sir

@stewin --- will make a step up inverter , thanx

 

[Acca]

Hi all,I'm now tesmple class D with IR215x

 

[Acca]

See this simple class D amp with IR215x:
For freq. 100kHz is best (I use 80k)
Calculate freq. same as in IR2153 classic application.10u don't affect to the frequency because that secondary of transformer has very high impedance to cause any change in freq.
Few pics tonight...
Sound good and no hum or hiss.
I use 12V to 220V transformer,power is not important.220V coil goes to IR and 12V goes to audio signal.One nice thing is that here is no 50Hz ripple on speaker when touch input,and audio source is isolated.Transformer boosts bass and it's used to amplify small signall from telephone,mp3 or another thing
Input 10u cap can be smaller,like 1u
D1-UF4007 or any ultrafast diode
It will be very compact class D when make pcb
Schematic:

 

[stewin]

what is the max voltage and impedance you have tested with??

 

[Acca]

250V on 8R (drop to 220V when full power) and 50V with 4R

 

[stewin]

which output fets did you use sir acca?

 

[Acca]

I use IRF740 and IRFP240 but you can use any with enough voltage and current rating.

 

[Mondan]

http:// http://www.diyaudio.com/forums/power-supplies/248320-voltage-feedback-ir2153.html
)

 

[Acca]

Hi,learn more about 2153.It can,but like a buck or boost converter,and not for classic SMPS
PWM on buck and classic SMPS is different.It has several ways to implement feedback.

 

[Mondan]

Few new (better) designs from me
All schematics is tested.(second schematic tried directly on 310V line,with IRF740)

Hi,learn more about 2153.It can,but like a buck or boost converter,and not for classic SMPS
PWM on buck and classic SMPS is different.It has several ways to implement feedback.

Then you could do a completely enclosed audio speacker.(active loudspeaker)

Could you help me with documentation for boost with IR2153?

 

[Acca]

Yes.First see IR2151 PWM driver on internet.For boost we will talk in p.m.

 

[Mondan]

Yes,but you will see 27R in gates,which provide another dead time

6.8k*10pF=68nS (aprox.) Logic gates dead time.
IRF640 input capacitance aprox. 1.3nF.
27R*1.3nF=30nS

 

[Acca]

Thanks
I'm now designing high power amp,with IGBT and optocoupler drive.Gate driver will have about 20A continious or maybe higher and will be discrete,and will have about 30nS max rise and fall times.I plan to use IKW75N60 as switching device,because it's faster even than IRFP260.
Opto couplers will be used for drive.Logic gates will provide dead time.It will use +/-150V.
Freq. will be 80kHz,because it don't need to be higher,there isn't difference on sound with 80k and 800khz,I tried both.
It will be a huge amp.

 

[exflaco]

Acca 80k max audio 8k (10 times)deiference betwen 80k and 800k very big audible
These clok its good for bass and mid lows.(80k)fro higs and mids 300khz minimun or more.
The best choice 4 ways mid and mid bass d class and mid higs and higs ab class

 

[Acca]

Are you even hear class D with 80 and with 800khz?
Or your posts is based from internet posts?

 

[aman khalsa]

dc on output

hello sir acca .. i am facing a problem . Dc voltage on out put ...

i use z44n . 50vdc 8ohm spker ..

pls help

regards
Aman