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Class D Switching Power Amplifiers and Power D/A conversion

TAS5825M based amp
TAS5825M based amp
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Old 27th March 2019, 09:21 AM   #21
Firerunning is offline Firerunning  China
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Join Date: Mar 2019
Quote:
Originally Posted by lutkeveld View Post
If you send your requirements I can export a complete header file for you.
My requirements are:Process Flow 8 (Housekeeping, 2.0),up to 192kHz,32bit audio process,Hybrid Modulation,BTL Mode(2.0 Channel), PWM frequency set to 768 kHz and Class D bandwidth set to 175kHz,PVDD Tracking / Thermal Foldback disable,others are set by default.

Quote:
Where did you get it from?
I get the header file from a post on e2e audio forum
Question of TAS5825 Audio Format Support in PPC3
Although it was not what I really wanted, it still helped me a lot.
By the way,I found some necessary registers in the TAS5805M datasheet,which is exactly the same as the TAS5825M.

Best regards,

Firerunning
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Old 27th March 2019, 12:22 PM   #22
lutkeveld is offline lutkeveld
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Join Date: May 2013
Here is a header file dump of the Housekeeping flow that is already:
-Set to 32 bit data
-Set to hybrid modulation, Fsw=768khz and bandwith=175khz

The header file contains example code on how to write the settings to the device in C. Change to .h instead of .txt before use.

I used this way of setting the DSP on a custom PCB with atmel processor. In my case there was a small catch:
The array is big, so it needs to be placed in flash by adding 'const PROGMEM' before the arrayname. After that if you want to read the contents back you have to use 'pgm_read_byte_near'.

I don't know the specifics for your micro, you have to figure that part out yourself.
Attached Files
File Type: txt Housekeeping.txt (4.5 KB, 5 views)
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Old 28th March 2019, 08:42 AM   #23
aurel32 is offline aurel32  France
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Join Date: Jan 2010
I am a bit concerned by the power dissipation on the PCB. Would it make sense to use this circuit in dual mono, using 2 chips in PBTL mode (even for 8 ohm loads) in order to spread the heat dissipation on 2 chips?
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Old 28th March 2019, 08:51 AM   #24
Firerunning is offline Firerunning  China
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Join Date: Mar 2019
@lutkeveld
Thank you for the header file provided. I tried to configure the amplifier based on the header but failed. After I set it to BD Mode and deleted the DSP coeffs,the amplifier work again. I found that the coeffs can not be written in. This is a mystery.
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Old 28th March 2019, 10:56 AM   #25
lutkeveld is offline lutkeveld
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Join Date: May 2013
@Aurel32 I would not be too concerned when you are playing music. If you listen to sinewaves it might be troublesome. PBTL would be better for heat dissipation but doubles idle current, component cost and board space.

@firerunning Please confirm that the chip acknowledges all commands and writes the whole array. It should work, I suspect you have something wrong in your I2C write functions.
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