We had project like to design MA5332MS for Public Address system.

Is it possible to have transformerless soltuion ? any reference design for it ? 

 if not any suggestion for us ? 

We built a design with MA12070 but it does not start up.

I tried to find hints in data sheet, but little is given regarding required voltage levels (or impedance) at input pins to stimulate operation.

CLKM is connected to 5V over 10k resistor.

Is there a need to program MA12070 samples before use or are they delivered to start already without any controller ever connected?

The problem we have is that the right channel on our 2xBTL MA12070 amplifier board has a noise issue.
The left channel works perfectly (the sound is absolutely clear), but the right one makes a quite loud noise.

I'm looking for a permanent way to permanently change the i2s_format  of your REF_AUDIO_MA12070P reference boards. I would use 4 of these boards in tandem with a MiniDSP USB streamer to create a speaker demonstrator solution which we would carry around.

The MiniDSP i2s_format is fixed to i2s standard while your REF_AUDIO_MA12070P board boots up in left justified mode. I managed to reconfigure the board trough I2C as documented in the manual but these settings are lost after  power cycle.

配置I2S信号输入为“out, L/R, 16 bits lsbj”和“out, L/R, 18 bits lsbj”

扬声器充满噪音

ma12070p 不支持这种格式吗？

我用它默认的power输入格式（如下图）

如何在没有单片机的情况下正确配置格式？谢谢

Hi, can the half-bridge output of the chip IRS2092S be connected to the high-frequency transformer? Why can the chip work normally before the connection of the transformer, but after the connection of the transformer, it can not vibrate under the condition of no load or with load?

Hi All working on an intresting project and would like some input.

I am designing a high voltage (1500V), high current (500mA) AC power supply and was playing around with using a high power class D amp to power the primary of a 1:35 transformer. I've used a IRAUDAMP9 ingle channel 1700 W (2 Ω ) Half-bridge Class-D Audio Power Amplifier but I am having an issue with bus pump causing the powersupply im using to shutdown when I get to around half the desired power (~350W). I'm using a modular switchmode PSU from TDK-Lambda thats able to supply +/-75V (1200W total). I've played around with increasing the bus capacitance but have had very little impact. The bus pump is not much of a surprise as the frequency of the signal is only 50Hz.

To solve the problem of the bus pump I have been playing around with the idea of using two IRAUDAMP9 boards in a BTL confinguration to reduce/remove the pumping effect. Im using a op-amp to invert the input signal so that The two are 180degrees out of phase but I'm having a problem where when I connect the inputs to the amps high frequency (25kHz) is present at the outputs. If I only connect one input to one of the boards the output is as expected. 

I've played around with the series resistors (R3/R4) with that only having a detrimental effect.

Does anyone have any ideas what may be causing this or what else I can try to circumvent the bus pump.

Much appreciated