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Class D Switching Power Amplifiers and Power D/A conversion

Infineon MA12070 Class D
Infineon MA12070 Class D
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Old 18th September 2021, 09:37 AM   #491
tmuikku is online now tmuikku  Finland
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Alright it is not common practice then and I shouldn't try either because I want it trouble free. Two single rail supplies it is thanks
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Old 21st September 2021, 06:19 PM   #492
Nixem is offline Nixem  United States
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Could you run multiple pbtl modules on one single rail smps? I am looking at 3 MA12070P per single power supply, any recommendations how to wire and would decoupling capacitors be needed on the supply side? Thanks!
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Old 22nd September 2021, 02:52 AM   #493
lithoc is offline lithoc  Malaysia
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I was reading the data sheet of MA12070 (analog input) . I was interested to build a simplified 2.1 using SE (stereo) + BTL (subwoofer) .

I saw the SE configuration having high pass on the output .

I'm thinking of implement a passive low pass on the input of the BTL channel and set it as high gain .

Before buying the MA12070 , I just need to make sure it's doable
Any expert here to advise?

Thanks

Last edited by lithoc; 22nd September 2021 at 03:01 AM.
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Old 23rd September 2021, 12:48 PM   #494
mboxler is offline mboxler  United States
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Quote:
Originally Posted by lithoc View Post
I was reading the data sheet of MA12070 (analog input) . I was interested to build a simplified 2.1 using SE (stereo) + BTL (subwoofer) .

I saw the SE configuration having high pass on the output .

I'm thinking of implement a passive low pass on the input of the BTL channel and set it as high gain .

Before buying the MA12070 , I just need to make sure it's doable
Any expert here to advise?

Thanks
Before commenting on this idea, I'm confused. The MA12070 datasheet contains information about Rin, a resister that dictates the input impedance. However, when I look at the Typical Application Block Diagram, Rin is not shown. Where is it? As I see it, Rin 14K gets you an input impedance of 9.2K.
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Old 23rd September 2021, 01:43 PM   #495
ernperkins is offline ernperkins  United States
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I believe Rin is the input impedance of the chip's inputs, not a separate resistor. What's a little confusing is that Table 7-1 lists it as 14K (26 dB gain mode) or 21K (20 dB gain mode) while Table 9-3 lists it as 9.2K (26 dB gain mode) or 15.3K (20 dB gain mode). Perhaps Table 7-1 is without the AC coupling caps while Table 9-3 is with the recommended coupling caps.
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Old 23rd September 2021, 03:12 PM   #496
mboxler is offline mboxler  United States
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Originally Posted by ernperkins View Post
I believe Rin is the input impedance of the chip's inputs, not a separate resistor. What's a little confusing is that Table 7-1 lists it as 14K (26 dB gain mode) or 21K (20 dB gain mode) while Table 9-3 lists it as 9.2K (26 dB gain mode) or 15.3K (20 dB gain mode). Perhaps Table 7-1 is without the AC coupling caps while Table 9-3 is with the recommended coupling caps.
Sorry, I looked a little closer at the registers and see that 0x25 dictates the gain. Thanks!
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Old 26th September 2021, 01:18 PM   #497
mboxler is offline mboxler  United States
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One other point of confusion

The MA12070p can be configured PBTL (mono). As I see it, the chip must be processing the pcm data on the sd0 pin only if the word select pin is low or high, left or right. I can't figure out how one would configure the chip to process just one or the other and not both. I'm sure I'm missing something obvious.
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Old 26th September 2021, 04:50 PM   #498
lithoc is offline lithoc  Malaysia
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Hi

I think ma12070p (i2s) version is for digital input and it needs 2 x i2s signal which is much more complicated .
I'm looking for simpler analog version for now and hoping one day there's a digital preamp (skip the dac) and having 2.1 output for dual ma12070p ( 2x80w + 1x160w )

The other wishlist was hoping for replacement for the tiny tpa3118 pbtl . It can be much smaller build without inductor

IMHO, this chip really can takeover where tpa3116/8 left off
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Old 26th September 2021, 09:13 PM   #499
wealas is offline wealas
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Originally Posted by mboxler View Post
One other point of confusion

The MA12070p can be configured PBTL (mono). As I see it, the chip must be processing the pcm data on the sd0 pin only if the word select pin is low or high, left or right. I can't figure out how one would configure the chip to process just one or the other and not both. I'm sure I'm missing something obvious.
Page 29 of the datasheet has a diagram for PBTL and in the audio source section you will notice 0L, dummy listed as input. So the chip will only use the left channel data stream of SD0 as input. Very easy to test
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Old 13th October 2021, 02:34 AM   #500
Michael Xiao is offline Michael Xiao
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Default PILLOR MA12070 PL-AD-150 Userguide(CN)

Hi,
I'm the designer with PL-AD-150 from Shenzhen PILLOR, any problem or suggestion let me know, and I will answer it try my best, thanks!
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File Type: pdf MA12070功能介绍_使用说明.pdf (2.60 MB, 40 views)
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