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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th March 2013, 06:15 PM   #421
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by Tekko View Post
A basic rule of thumb for class d is that if you don't have an oscilloscope, do NOT build a class d amp!! Especially not one that exceed a few watts of power.

To build a class D amp, a Oscope is a must!! It's a requirement!! Without it you cannot verify the amp is working properly and doing what its supposed to do.

You need to be able to verify that it is switching properly without excessive ringing (caused by excess stray inductance) and not just oscillating wildly all over the place.
ohh f**** im going to build it aniways and hope for the best
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Old 6th March 2013, 10:31 AM   #422
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Default Class D amplifier with the crystal oscillator.

Good morning everyone.
My contribution to the forum.
I drew three PCBs (clock / signal input / PWM generation, comparator and power stage / protection).
I'm designing a new layout on one plate.
circuit already tested and fully operational.
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Old 6th March 2013, 03:27 PM   #423
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Quote:
Originally Posted by luizcpimenta View Post
Good morning everyone.
My contribution to the forum.
I drew three PCBs (clock / signal input / PWM generation, comparator and power stage / protection).
I'm designing a new layout on one plate.
circuit already tested and fully operational.
Looks like D500
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Old 6th March 2013, 05:21 PM   #424
exflaco is offline exflaco  Armenia
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Location: Santa Fe
Luiz share tre pcbs to test it
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Old 6th March 2013, 08:16 PM   #425
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Quote:
Originally Posted by apexaudio View Post
Looks like D500
Yeah looks like the D500, or part thereof.
The power stage is the same except the setting deadtime that does not exist in D500.
Could you send me the files from D500?
I have other amplifiers based on IRS2092. If you want I can send you by email.
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Old 6th March 2013, 09:25 PM   #426
krakow is offline krakow  France
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What type of sigal should enter on D200 ?
BF or BF+250kHz ?
Thanks
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Old 7th March 2013, 06:01 PM   #427
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Quote:
Originally Posted by krakow View Post
What type of sigal should enter on D200 ?
BF or BF+250kHz ?
Thanks
Audio signal 1,4v RMS max. from preamp (mixer) to D200 input, +/-55V from PSU and speaker on amp output are all connections.
Regards
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Old 7th March 2013, 08:48 PM   #428
krakow is offline krakow  France
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Quote:
Originally Posted by apexaudio View Post
Audio signal 1,4v RMS max. from preamp (mixer) to D200 input, +/-55V from PSU and speaker on amp output are all connections.
Regards
Ok, many Thanks
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Old 7th March 2013, 08:51 PM   #429
krakow is offline krakow  France
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If I down the supply to +/-12V, what is the output power ? (With TIP640)
Thanks

Last edited by krakow; 7th March 2013 at 08:59 PM.
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Old 7th March 2013, 09:32 PM   #430
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Quote:
Originally Posted by krakow View Post
If I down the supply to +/-12V, what is the output power ? (With TIP640)
Thanks
Amp can't work with +/-12V, I use +/-38V minimum rail voltage and +/-80V maximum with IRF640N for test.
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