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

笔记本电源19.6V 输入到电路，然后启用设备： /ENABLE = 0.Unmute device： /MUTE = 1.，PBTL模式输出20V直流电，但是如果只输入9v工作正常，请教一下专家原因，PCB检查很多次没有问题。

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!

Hello,

I would like to design a PCB for the MA12070 IC. I have following queries. Kindly help me with them. Thanks in advance!

1. Datasheet recommends a micro-controller based power-up and power-down logic. However, is it ok to tie the nENABLE pin directly to GND and connect the nMUTE circuit to a P5V-680E-1M-47uF-GND circuit with anode of a diode connected to the join of R-C and cathode connected to the join of R-R for fast turn-off? Something similar to that recommended by the TDA7293/4 IC datasheet.

2. To avoid device failure due to inrush current, the Errata sheet recommends 'schottky diode to be connected at the output of each node.' Is is correct to assume that a the cathode of schottky diode be connected directly to the output pin and the anode to ground?

3. To avoid device failure due to PVDD hot plugging, the Errata sheet suggests a power supply with soft start function. Is it correct to assume that the solution to this can be the circuit in Fig. 5 of the Demo_BassAmp note using two IRF9358 MOSFETS?

4. Is it correct to assume that points 2 and 3 are mutually exclusive and that suggestions in both 2 and 3 above should be implemented?

5. Does the device operate and perform better with an external heat-sink in addition to the copper connected to the IC thermal pad?

Thanks again!

 i want to evaluate ic ma2304 and make a ma2304 demo board. i have two issues。

1.Is the schematic correct in User manual for MA evaluation boards
MA2304DNS/MA2304PNS ?

2. lpc11u68 burns  the fireware bin file . is the “CRP DISABLD”drive  already build-in lpc11u68 's usb bootloader ?no need other fireware '?

Thanks