Class D Audio Amplifier IC Forum Discussions
Hi
dear all we are working on the project class D amplifier, based on IRS2092,
we are following the reference document IRUDAMP9.
In some pcb, we found that capacitor C33 , C34 (0.47uF /250V) is burnt out
they are getting burn out , when we switch on the set.
this is not 100%, but still , 5% sets we found.
and once we replace the cap, PCB is working fine
we are using Kemet make high arc capacitor 0.22uF/500V
pl suggest what could be the reason
rgds
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Hello, I'm designing a new amplifier based on IRS2452AM but I dont understand well how configurate the self-oscillator resistor if I use an external oscillator in CLK pin. Do I have to adjust to the external oscillator frecuency?
Thank you.
Javier Urbano.
Show LessHi,
Could I check, if IFX has any similar solution for audio amplifier as below?
IS31AP4990D Data Sheet (lumissil.com)
Show LessHello, I`m involved in a new amplifier design based on IRS2452AM. I have a doubt about the post-filter feedback used in IRAUDAMP23 evaluation board. It is not used in the typical application circuit from Functional Description AppNote and I don`t know if it is recommended o not. What did you based on to decide if your design need one of this.
Thank you.
Javier Urbano.
Show LessHi there!
I'm designing a Class D amplifier to work like a transconductance power amplifier. I have doubts about the modulation index configuration in the IRS2092. I read the AN1138, and I understood that the modulation index is the rate between Ifb and Iin (page 5), but I'm not sure.
Can you help me with this? Thanks!
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We are looking at designing a 600W Audio Amplifier and the IRS2461S looks a suitable candidate. The user manual for the REF_IRS2461S_5KW reference design says the Schematics are available on request, does anyone know how I could get a copy of the Altium schematics.
Look forward to hearing from you.
Regards
Ian
Show Lesssmartconx_target@Q!w2e3r4t5y6u7i8o9p0||/t5/D%E7%B1%BB%E9%9F%B3%E9%A2%91%E6%94%BE%E5%A4%A7%E5%99%A8%E8%8A%AF%E7%89%87/%E8%AF%B7%E9%97%AE%E5%9C%A8MA5332-%E5%89%8D%E9%9D%A2%E5%8A%A0%E4%B8%8A%E8%BF%90%E6%94%BE-%E4%BC%9A%E5%AF%BC%E8%87%B4%E8%87%AA%E6%BF%80-%E5%BA%94%E8%AF%A5%E6%80%8E%E4%B9%88%E8%A7%A3%E5%86%B3/td-p/684492
Show LessHi,
I purchased MA12070PXUMA1 chips for my prototype boards in July 2023 from Digikey assuming that they were the new silicon revision according to datasheet V1.01 from 2022-02-09.
It seems that fixes from errata sheet V1.0 of 2019-04-08 are not included in the chips that I have. Especially output polarity in BTL mode is still reversed and the amplifier reacts to gain adjustment messages via I2C to register 0x25, which should not be the case anymore according to datasheet V1.01.
The imprint on the chips says:
MERUS(TM)
MA12070P
LF224696.00
H2315
Can anyone determine if this is the old or new silicon revision?
If I buy new chips, how can I make sure to get the latest silicon revision?
Thank you very much for your support!
Fini
Show LessHi,
I've just noticed that the MA2304PNS and the MA2304DNS are both marked as Not Recommended for New Designs (despite having only been launched under two years ago).
Could anyone shed some light on why this has happened? Is there a replacement in the pipeline? Will they continue to be produced for a few years?
Max
Show LessHi,
My customer currently evaluating MA2304 EVAL board and informed us some evaluation results. Then they have a two questions from their evaluation. Pls get back to me with your answer in your return mail. Appreciate for your support!
=== Customer evaluation result and question ===
I would like to inform you that I have finished measuring the audio characteristics of the MA2304 evaluation board.
Audio characteristics were measured using AP in both LCP mode and HAP mode. (Report attached)
The evaluation results are briefly described below.
①Residual noise is much improved compared to MA12070P. ⇒◯
②Comparing LCP mode and HAP mode, residual noise is better in HAP mode, but other than that they are almost the same.
③“THD+N vs level” is worse than MA12070P. (MA12070P is Min0.01%, MA2304 is Min0.03%) ⇒✕
④“THD+N vs Frequency” does not deteriorate even when it is 1KHz or more. (MA12070P deteriorates above 1KHz) ⇒◯
Overall, I'm concerned about the distortion, but other than that, the results were mostly satisfactory.
Questions:
I would like to know the reason for ③ (why is it worse than MA12070?).
I would like to know the reason for ④ (general DAMPs deteriorate at frequencies above 1KHz, but MA2304 does not deteriorate; what kind of processing is done there?).
Power consumption will be measured in next evaluation step.
=== end ===
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