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Class D Switching Power Amplifiers and Power D/A conversion

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Old 8th August 2013, 07:42 PM   #1
Acca is offline Acca  Serbia
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Default DIY Good Class D amplifier

Simple amp. based on SG3525 PWM IC.
Frequency is fixed to 150kHz (fixed f is good choice) but you can modify it by changing RT/CT.
PWM is ~2-98% (which is very good).
IR2184 is HI/LO side gate driver.
Dead time provided by this IC.
Set the potentiometer on half.Turn amp ON.Set output voltage to 0V.
This amp works from first attempt
On PCB i have to use external 12V PSU for IC's
Max input voltage is +-80V.
With 4k7 adjust gain.
Output inductor is gapped core (can be used yelow toroids from AT/ATX PSU,they have internal gap.
In external 12V version you can regulate the output power only by voltage on fets.
12V is referenced to -V,not to GND!
On picture I used totem pole output instead of FET's and driver IC,but I tested wih IC and FET's too.
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File Type: jpg PTDC0013.JPG (147.9 KB, 5124 views)
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Old 9th August 2013, 02:20 PM   #2
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i do not think the proformence is good~
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Old 9th August 2013, 02:47 PM   #3
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Better use TL494 in place of SG5325 with collectors joined 'ORed' and you will get better results. Try to use feedback also to make it immune to gain variation with power supply deviation.
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Old 9th August 2013, 04:41 PM   #4
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Neat, Acca! Did you manage to get your point-to-point prototype running?
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Old 10th August 2013, 04:07 AM   #5
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Nice interesting Project...
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Old 12th August 2013, 10:26 AM   #6
Acca is offline Acca  Serbia
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@airwavesystem
It's better than UcD

@workhorse
No,I tried it,and here's more noise than 3525.And max. PWM on 494 is smaller.
I want to have no feedback.Because of this power can be varied only by voltage on fets,without any change.You can use variable supply and vary volume by it.

@Freeman
Yes.

@chinokscapsighter
Thank you.
Few man's from another forum make this amp. in progress.
When they make it,I'll post here.

Last edited by Acca; 12th August 2013 at 10:30 AM.
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Old 12th August 2013, 10:33 AM   #7
Acca is offline Acca  Serbia
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This smps can be used to power this amp.:
Uni SMPS 3 - Smps - DiyAudioProject
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Old 21st August 2013, 12:44 PM   #8
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just a few questions from Holland......

Can I use the IR2117 to replace the IR2184?
Which transistor can i use for T3
Must R13 be 4K for 80V
Which Fets are T1 and T2 and can I put for example 2 X IRFP460 into your design and bring up the supply to 150V?

Thanks for looking at my questions.
Hank
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Old 21st August 2013, 05:44 PM   #9
stewin is offline stewin  Kenya
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hi acca this a very nice project . just wanted to know have you tried your amp at +/-80vlts with 1ohm load? which fets did you use .? and can it be bridged at 2ohms with that voltage?

also can i redraw your schema and use ir2110 or ir2153 as the gate drivers.?

thanking you in advance steve .
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Old 6th September 2013, 06:49 PM   #10
stewin is offline stewin  Kenya
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hi acca any developments of your amp?
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