Class D Audio Amplifier IC Forum Discussions

Hi,

  We're at the point of deliberating the floating power supply (VAA and VSS) design. We'd like to pull up the power pin with an external resistor and capitalize on the internal Zener diode for regulatiing.

Then we find something we couldn't realize that the supplying current the these pins are both around 14.5mA and 1~1.7mA at idle and off status. But the datasheet shows them in 5~7.5mA and 1.5~3mA. I can't realize where the differences between 14.5mA of evaluation board and 7.5mA of specifications. We didn't find similar differences in IRS2092 before.

Thanks for your help,

Ted

Hello, I am using the IRS2452AM in order to make a full-bridge class D amplifier, so I use the BTL mode. However, I don't know what kind of feedback topology is recommended. The IRAUDAMP23 shows how to do a feedback, but the IC is used in half-bridge mode (BTL off, 2 channels). Do you have any solutions ? Thanks in advance.

Hi, I have just repaired a commercial product power amplifier.

It uses an IRS2092 to drive 2x IRFB4227 directly from HO and LO via 6.8ohm gate resistors with a drive voltage of 15v.

When Idling and driving a load of 8ohms the temperature of the IRS2092 is showing 60-65c on my thermal camera.

Is 60-65c a normal/safe running temp for IRS2092?

I'll attach thermal images of temperature from directly beside the IC, the coolest part of it and the hot centre.

Hi,

We are starting off a new design with adopting MA5332MS amplifier solution. We have a chance to use differential output source to work with MA5332MS.

Since the datasheet states the balanced configuration can cause slightly higher distortion and the compensation RC seem not exactly the counterpart of feedback end. And I take it we'll unable to test it on the evaluation board. So I'm intrigued to know if the Balance-Input configuration can have the benefit of better CMRR than Single-End configuration. This information will be very valuable for our new design. Thanks for your help!

Customer has MERUS™ audio amplifier and this is connected to a raspberry zero w and Volumio and is not displayed in the menu under playback. 

They used MERUS™ audio amplifier (KIT_40W_AMP_HAT_ZW).

They did everything and read the documentations. However, they can't find the required Volumio image on the Github page. The driver for the MERUS™ Audio Amplifier is not listed under Volumio.

dear support team, 

could you help to clarify what is the modulation approach of IR 4302M like AD or BD mode? and are all infineon class d amp use the same moulation mode? thanks!

BR,

Particles

Can you kindly help with following questions, thanks.

Question 1

Part number MA12040, is the power supply of the gate driver of pins 57, 58, 60, 61, 62 and 63 a digital circuit?

Question 2

Start-up procedure
It is recommended to follow the start-up procedure as described below:
1) Make sure the all hardware pins are configured correctly: e.g. BTL, Slave Clock mode.
2) Keep the device in disable and mute: /ENABLE = 1; /MUTE = 0.
3) Bring up 5V VDD supply and PVDD supply (it does not matter if VDD or PVDD comes up first, provided that
the device is held in disable).
4) Wait for VDD and PVDD to be stable.
5) Enable device: /ENABLE = 0.
6) Program applicable initialization to registers.
7) Unmute device: /MUTE = 1.
😎 The device is now in normal operation state.

What happens if you don't follow the startup procedure!?

Thanks!.

Thank you very much for answering my question!
I use ma12070 to make an audio amplifier and use pbtl mode. Normal operation after power on.
But when I configured the input mode to single ended RCA input, the speaker made a lot of noise. I changed the grounding mode, and the problem remains the same.

I wonder if it is wrong to configure the single ended input mode as shown in the figure below in pbtl mode?

Hello, engineer
I used three ma12070ps to make a multichannel power amplifier,
After power on, the chip can work normally, but why does the output low-pass filter inductor (6.8uh) make a "Zizi" sound

What causes the inductive filter to make physical noise?? Thank you