Infineon MA12070 Class D

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#2,002
Just noticed a while ago Infineon have discontinued MA12070 /P and several other IC's, list below.

https://www.infineon.com/cms/en/product/power/class-d-audio-amplifier-ic/integrated-class-d-audio-amplifier-ics/?filterValues=~(productStatusInfo~(~'discontinued))&visibleColumnIds=name,385,productStatusInfo,opn,orderOnline,870,871,604_156,867_157_nom,522

MA2306PNS
2x63 W, 13.5-26 V, ultra-low idle power, inductor-less, with volume control and peak limiter

MA2306DNS
2x63 W, 13.5-26 V, ultra-low idle power, inductor-less, with integrated DSP

MA2304PNS
2x37 W, 10-20 V, ultra-low idle power, inductor-less operation, with volume control and peak limiter

MA2304DNS
2x37 W, 10-20 V, ultra-low idle power, inductor-less operation, integrated DSP

MA12070P
Integrated 80W - 2xBTL/4xSE channel digital input multi-level class-D amplifier

MA12070
Integrated 80W - 2xBTL/4xSE channel analog input multi-level class-D amplifier

MA12040P
Integrated 40W - 2xBTL/4xSE channel digital input multi-level class-D amplifier

MA12040
Integrated 40W - 2xBTL/4xSE channel analog input multi-level class-D amplifier

IR4312M
Integrated 35W - 2 channel analog input Class-D amplifier

IR4311M
Integrated 35W - 1 channel analog input Class-D amplifier
 
#2,003
Interesting, in their "smart speaker" design portfolio both suggested amplifier chips are discontinued. Their 60GHz radar chip, which they seem to suggest the speaker could use to tell someone's entered / in the room, is "active and preferred".

Apparently, "amplifiers" just arent worth making, compared to other things they could be doing. "Hey - look at me - I can control my phone using sign language!"

An amplifier. Pffft!
 
#2,004
Infineon discontinued all monolithic integrated audio amplifiers a while ago but keeps producing Multi-Chip-Module integrated audio amplifiers. Like the quite good MA5332MS.

Some other old news. It seems the reason for sudden failure is known at Infineon (regarding MA12070): https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d46264a8de7e0164b14d8ab40c6f

Since the MA12070 IC is being dumped at distributors as it is EOLed it maybe is good to know when designing something with it. A slow start PSU is apparently mandatory.
 
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#2,005
jean-paul said:
It seems the reason for sudden failure is known at Infineon
Click to expand...
Oh yes, discovered by myself in 2017 😀
The fire also damaged the PCB quite badly, it was not possible to repair.
eclipsevl

Post in thread 'Infineon MA12070 Class D'

xrk971 said:
If anyone has experience with this new chip please share.
Click to expand...

That was 2 years ago before Merus was acquired by Infineon.

This is MA12070P, with the I2S interface. Later I did another revision of PCB with Schottky diodes added to protect the IC from overstressing (you can see results on the photo attached).

The sound was good thou, I still have a couple of PCBs and IC's to play with. However, I did not compare it with my TAS5548+TAS5162 amp.
 
#2,010
We now know the function of the datasheet 0.1 Ohm resistor in the power line. It is not luxury with the average SMPS as PSU. Also that shorting outputs is a possibly fatal action for the wrong reasons. Both drawbacks one can easily live with (together with the mandatory filtering of PSU and outputs). Let's say the chip has a character but pays off with sound quality. Also that minimal/cheap implementation is, as expected, not the right way for desired longevity/reliability and optimal performance. Datasheet implementation seems about right 😀

The Gerber files by altus fidelitus may be handy as they contain all that is necessary except the MCU: https://www.diyaudio.com/community/threads/infineon-ma12070-class-d.347422/page-79

The XC6219B502MR-G regulator may be replaced for the pin compatible TPS7A2050PDBVR (ultra low noise and cheap). Both ICs would need a 5.5V PSU or a 6V PSU with series Schottky diode before them.
 
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#2,017
jean-paul said:
Infineon discontinued all monolithic integrated audio amplifiers a while ago but keeps producing Multi-Chip-Module integrated audio amplifiers. Like the quite good MA5332MS.
Click to expand...
It seems like embracing the IC+Mosfet approach is a market-driven move.
While Infineon's Merus page still cites the multilevel design (the original tech that went into Merus as a startup, before Infineon's acquisition), looking at the details of the more recent chips I'm seeing no references that they're using that specific design.
The curves, however, look very similar. I'm perplexed.
 
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