Class D Audio Amplifier IC Forum Discussions

Dear Developer team / community

we are looking to make a design for audio amplifier , our target is to achieve 3000W /ch

2 ch amp we are planning to make.

3000W/CH at 4 ohm load we are planning.

can u please suggest the CHIPSET we should use, and some application notes /document on this.

rgds

yogesh singhal

could you please answer the following question we received via social media? Here is the link to our post: https://www.facebook.com/345383962211058/posts/5944904058925659/

‘’What's the technology? Is it still MOSFET, or is it GaN or a hybrid?’’

Thank you very much.

Hello! , I used arduino to try to set the value of Select Power Mode Profile setting, using I2c.write(0x20, 0x00, 0x01); Successful, but all the settings are restored after the power is cut off, can I not permanently write the configuration settings of the MA12070?

1.Both AD0 and AD1 are grounded

2.code

Clarification question: 
On the Datasheet for the MA12040P Amp IC, pins 49 and 64 are designated as do not connect, as they are internally connected to 5V -- however, on the MA12040P Amp Eval board (and documented on the eval board schematic) these pins are externally connected to 5V.

We've got jumpers on our board so we can connect to 5V or not -- 
Can you provide guidance here?  Why is the eval board connecting these pins to external 5V, despite the Datasheet guidance?

With respect to Infineon's Class D Audio Amp, P/N IRFB4020PBF, the datasheet states, "Can deliver up to 300W per channel into 8 (ohm) load in half-bridge configuration".

What is this 300 Watt limit based on?

What are the test conditions?

Assuming the thermal design is okay, can it allow for more power and current than limited by this statement?

Reference datasheet linked @ https://www.infineon.com/cms/en/product/power/mosfet/n-channel/irfb4020/

Greg

Hello,

I am using a MA12040P for audio playback of a I2S stream being produced by the SAI peripheral of an iMX8M Plus.

I have ported the driver from the Raspberry Pi into the Linux kernel provided for the imx platform and it appears to function.

The problem I am having is that there is no audio output by the amplifier when I run the ALSA speaker test tool using the command line:

speaker-test -FS32_LE -Dsysdefault:merusaudio

My initial schematic for the connection between the iMX and the amp was:

This has been altered to switch the nMute line from a pull up to pull down and the MCLK signal is now routed to a clock output directly from the iMX clock peripheral and is set to 12288kHz.

This was done because the iMX8MP SAI peripheral will only output an MCLK signal during playback.

The SAI peripheral now consumes the MCLK from the external pin and generates the BCLK from that signal.

I have captured some of the signals on my scope:

Full Power-up Sequence:

There is a blip on the MCLK line when the output pin is first muxed to output the clock, a 24MHz signal is briefly present.

Clock Blip Detail

Enable Detail. MCLK is 12.288MHz at this point:

There is a 6-7 ns phase shift between MCLK edge and the BLCK edge, probably due to propagation through the SAI peripheral.

During Playback:

Here is a dump of some of the MA12040P registers after the driver has configured the device:

Address    Value

I do not know what else to check as there are no errors being reported as far as I can tell.

Is the clock blip before the amp is enabled a problem?

Is the phase shift between the MCLK and the BCLK a problem?

Any thoughts on next steps in debugging this issue are appreciated.

Hi 

With IRS2452AM, application notes and examples describe 400kHz switching frequency (IRAUDAMP23 for exemple). How modify values to get self-oscillation frequency higher (around 600kHz or 700kHz) ?

Thank you

Hello, I wander if chip name MA5332M is real product of Infieon. Is this the same as MA5332MS? Chip MA5332M is inside Sabaj amplifier, is it real Infieon or is it a feke?

Hi Sirs,

I have a MA2304DNS EVAL Board, I can use this EVK to play music to speaker. But it seems not working when I adjust EQ,

here is the procedure:

1. connect power and speaker to EVK

2. Input audio <--I can hear the music correctly.

3. Run Merus 1.0.0-819

4. go to DSP page and setup low pass filter with fc at 100Hz (see attachment)

5. "APPLY".

5.1. I notice warning symbol is gone, after press "APPLY".

5.2. Music output from EVK disappear

6. reboot EVK

7. audio same as before, no any change (by ear)

I also tried different input signal such as 1kHz sine wave with 100Hz cutoff freq, but 1kHz audio still loud and clear after reboot.

My questions are:

1. Please help clarify above configuration procedure, I don't know where is the mistake.

2. Is reboot EVK necessary? I expect chip should reflect EQ result immediately after uploading, no need to reboot.

3. Can I read out filter parameter to Merus and display to DSP page ?

Thanks,

J66

Hello,

Kindly help me with the following questions:

1. What should be the preferred voltage on MSEL0, MSEL1, nMUTE, nENABLE, nClip, nERROR, SCL, SDA, CLKM/S, CLKIO, AD0 and AD1? 3.3V or 5V?

2. What would be preferred way to generate VDD: 1. From PVDD using a linear regulator or 2. From an isolated supply? If using VDD from an isolated supply is preferred, what would be an ideal place to tie the two grounds together?

3. If using an isolated supply is preferred, I am assuming that AVSS, DVSS, CREF and CDC should be tied to the isolated ground. Is my assumption correct?

Thanks in advance!