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Class D Switching Power Amplifiers and Power D/A conversion

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Old 18th September 2013, 11:39 AM   #3701
opor is offline opor  Thailand
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Hi Lorylaci,
Thank you for your advice. But what is fsw of this circuit with 4.7nf feedback , 50uh coil and 0.47uF LC filter.

BR
Opor
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Old 19th September 2013, 05:34 AM   #3702
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Quote:
Originally Posted by opor View Post
Hi Lorylaci,
Thank you for your advice. But what is fsw of this circuit with 4.7nf feedback , 50uh coil and 0.47uF LC filter.

BR
Opor
I CANNOT TELL! (Very few can!)
As I said: swtiching frequency is a function of:
- duty cycle
- propagartion delay
- feedback network
- LC filter
- ETC!!!
Analytical determinition by values is extremely difficoult, simulation or mearsurement is possible.

First of all try to undesrtand swithcing basics, like self-oscillation. Its not a clocked (triangle wave comparator) class-D. If its to much for you, pick up books (and application notes) and LEARN!
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Old 19th September 2013, 05:40 AM   #3703
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Quote:
Originally Posted by pergo View Post
was only a test for the control board.
I will never use IRF640N or similar fets for a class D, but i had them in stock.
The test was focused on noise, too.

Anyway, i prefer IRS20957 instead of shifter+splitter+IR2x10. Less components, more safety, more performance.
IRS20957 is a good one, it has definetly less propagation delay (much faster) than the dsicrete levelshifter+IR2110. It has also lossless current sensing option (measureing voltage drop at FET's Rdson while FET is on).
However it is harder to get, and more expensive (twice or tripe the price of IR2110).

If you says your s***y matrix board is so good with IRF640N, then why you say you never is it?
Of course I understand, I prefer testing with cheap FETs on stock too, but later I realized that schamtic and layout should be tuned for the actual setup, actual FETs.

Also think about using full-bridge. With cheaper FETs (half the voltage rating), you can cut back losses down to half!
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Old 19th September 2013, 09:56 AM   #3704
pergo is offline pergo  Italy
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Mouser sell PDIP IR2110 at 3.45€ and IR2010 at 3.75€. Soic version at 2.71€ and 3.87€.

IRS20957 at 2.99€

Not bad.
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Old 20th September 2013, 08:06 AM   #3705
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Quote:
Originally Posted by pergo View Post
Mouser sell PDIP IR2110 at 3.45€ and IR2010 at 3.75€. Soic version at 2.71€ and 3.87€.

IRS20957 at 2.99€

Not bad.
Prices depend extremely. IR2110 is and "old" one, it's been around in PSUs for a long, so you can get it almost everywhere. In my local shops it costs 1,5-2,5 Eur PDIP (depending on order size).
For example, In Hungary IRS20957 can be only bought from Farnell, at about 4 eur (depentind on quantity).
Think of stewin in Kenya. Farnell ships there, but at a great price, plus customs.
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Old 23rd September 2013, 04:10 AM   #3706
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Default D CLASS SCHEMATIC

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Old 24th September 2013, 04:34 AM   #3707
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Quote:
Originally Posted by andrewlebon View Post
Its not an UcD amp. Its a simple triangle generator ful-bridge class-D amp. Its not reccomended for quality design, since it has no feedback (high THD, low damping factor, no PSRR).
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Old 26th September 2013, 12:09 PM   #3708
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Hi lorylaci, I want to build iraudamp7 with my own pcb and I have a question:
You show your PCB with big ground plane on a double sided board but in IR note AN-1138 is wrote: The irs2092 does not accept single ground plane. And there is a picture show a 3 plane: analog ground, reference ground and power ground. What is your opinion about it?
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Old 28th September 2013, 01:33 PM   #3709
Cresnet is offline Cresnet  Germany
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my amplifier shows 192KHz at output, sine wave

even when I feed it with sine wave 1KHZ, still I get 192KHz at speaker output

any advice?
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Old 28th September 2013, 04:23 PM   #3710
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Default detex smps and irs1500 stereo pcb

stereo d class amp kit
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