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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 25th March 2019, 08:14 PM   #11
JMF11 is offline JMF11  France
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They issued a similar document for the TAS3251: http://www.ti.com/lit/an/slaa799a/slaa799a.pdf


It seems that they don't use the same uDSP in their different smart amps... The TAS3251 one looks less smart than the one in the TAS5825 :-(


JMF
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Old 26th March 2019, 02:10 AM   #12
Firerunning is offline Firerunning  China
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Quote:
Originally Posted by lutkeveld View Post
You have the EVM and motherboard I assume?
I don't have the EVM and motherboard. I designed a board myself. Besides, I don't have the PPC software because I am just hobbyist,which is the biggest challenge for me.
The code I used is in the attachment,my microcontroller is STC8A8K64S4A12.
I read the registers after configuration and found out that Register 0x71 was set to 0x04(clock fault). The I2S signal was given by Amanero.
Attached Files
File Type: txt TAS5825M.txt (1.4 KB, 5 views)
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Old 26th March 2019, 08:38 AM   #13
lutkeveld is offline lutkeveld
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Can you set the output of the Amanero to 16bit 48KHz for testing?

This does not really seem like a DSP configuration issue, more like a I2S clocking issue.
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Old 26th March 2019, 07:35 PM   #14
JMF11 is offline JMF11  France
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Quote:
Originally Posted by lutkeveld View Post

Hi, and just to know, how do you solder the TAS5825M ? I have seen that you put a lot of vias below the chip. Do you hand solder it ? If the case, what is the right sequence to do it ?

Best regards,


JMF
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Old 26th March 2019, 07:45 PM   #15
lutkeveld is offline lutkeveld
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I used a stencil and reflow station. You have to be really careful about aligning the stencil and taking it off without smearing. Then you place the chip and reflow it, it's pretty do-able.
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Old 26th March 2019, 08:06 PM   #16
JMF11 is offline JMF11  France
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Thanks !


You use an Hot air reflow station ? Infra red or oven ?


Do you use a full PCB stencil or a "local" VQFN32 one ?


JMF
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Old 26th March 2019, 09:00 PM   #17
lutkeveld is offline lutkeveld
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I use a cheap atten 858d. An oven would also work. I would recommend a full stencil, because then you can directly solder all other SMD components at the same time, but both types will work.
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Old 27th March 2019, 05:18 AM   #18
Firerunning is offline Firerunning  China
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Quote:
Originally Posted by lutkeveld View Post
This does not really seem like a DSP configuration issue, more like a I2S clocking issue.
Thanks for your advice, my amplifier is working now. However,when I change the sample rate,it doesn't work anymore. Besides,it does not support the 176.4/192khz sampling rate anyway. May I have to configure the DSP to support such a high input sample rate?
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Old 27th March 2019, 06:25 AM   #19
JMF11 is offline JMF11  France
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Thanks Lutkeveld. And do you have to heat from the bottom of the PCB, using the vias (and if yes, with soldering iron or hot air) ?


JMF
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Old 27th March 2019, 08:13 AM   #20
lutkeveld is offline lutkeveld
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@Firerunning Your txt files is incomplete, normal PPC3 export contains a big array of 100's of lines. If you send your requirements I can export a complete header file for you. Flow 8 supports 192Khz but your file wont load a complete flow. Where did you get it from?

@JMF11 I would recommend to raise the PCB slightly above the table that you are working on so that the heat does not get pulled away. If you heat the chip gradually everything will reflow properly. Heating the bottom or using an oven certainly helps to reflow the exposed pad properly. I always pull back the soldermask on the bottom of the PCB so that I can also use a soldering iron to be sure.
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