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Old 2nd July 2013, 04:17 AM   #11
jory16 is offline jory16  Colombia
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jlester87 hello, I think it's great PCB design, a few months ago I did a very similar design and found problems with noise that you mentioned, as was working with a layer, the quickest solution was to increase the switching frequency at 450KHz but that has its counterparts.

greetings ...
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Old 2nd July 2013, 09:08 AM   #12
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Back then I didn't increase the switching frequency further to 300kHz because I am careful not to overheat the IR2110 as I was using IRFB4127 mosfets which has a Qg value 150nc.

With my current layout there are no noise problems with my laptop as a source. EMI is good too. And undershoot is somehow minimized.

Can you show the pics of your amp?
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Old 8th July 2013, 08:07 AM   #13
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Quote:
Originally Posted by jlester87 View Post
I don't have a stiff power supply at hand yet so I didn't push it hard.

I'll publish my power measurements after I received my power supply. (ETA about 2 weeks)

I'll gonna use +-75V rails.
Target output current will be 16A into 2 ohms and 11A into 4 ohms (500W RMS)

Actual results might be better
My 62-0-62VAC @240VAC (15A) transformer has arrived. Filter caps are 6800uf 100V rated.
Dummy load is configurable to 8/4/2 ohms. I'll submerge it in water

I'll make power measurements next weekend
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Old 20th July 2013, 11:58 PM   #14
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I replaced my client's defective plate amp of AV123 MFW-15 with my amplifier module
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Old 4th August 2013, 10:40 AM   #15
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Finished installing JLAmp1000D into MFW-15 plate amplifier
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Old 25th August 2013, 06:26 PM   #16
PetruV is offline PetruV  Romania
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Looks interesting,will you post an pcb layout?,can this run at 20vdc x2?
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Old 26th August 2013, 12:58 AM   #17
jory16 is offline jory16  Colombia
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Quote:
Originally Posted by jlester87 View Post
Back then I didn't increase the switching frequency further to 300kHz because I am careful not to overheat the IR2110 as I was using IRFB4127 mosfets which has a Qg value 150nc.

With my current layout there are no noise problems with my laptop as a source. EMI is good too. And undershoot is somehow minimized.

Can you show the pics of your amp?
Hello jlester87, the image shows the prototype that mountain, I have no noise problem with a linear source despite this fact in one layer without display earth.

when connected to a SMPS, I hear a high frequency noise, to mitigate a bit, increase the frequency of 250kHz to 400kHz, but this is not desirable because it heats up the IR2110.

I can you please make 2 measurements with the oscilloscope, to make a comparison of forms of waves that do not seem quite right?

regards...
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Old 28th August 2013, 01:59 PM   #18
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Quote:
Originally Posted by PetruV View Post
Looks interesting,will you post an pcb layout?,can this run at 20vdc x2?
PCB layout is not for sharing, and it's double sided, so it's difficult to etch. I will release 2 pairs version of this and will mass produce the PCB so it will be cheap, around 12USD per board. (excluding components)

Advantage of using an external supply for the driver IC is that it will work at wide range of power supply voltage, I tested this to work from +-35 to +-75VDC without changing any resistors

You should use single(independent) 12 to 14VAC 2A EI core for the driver IC supply, external 14 to 16VDC should work too.

Quote:
Originally Posted by jory16 View Post
Hello jlester87, the image shows the prototype that mountain, I have no noise problem with a linear source despite this fact in one layer without display earth.

when connected to a SMPS, I hear a high frequency noise, to mitigate a bit, increase the frequency of 250kHz to 400kHz, but this is not desirable because it heats up the IR2110.

I can you please make 2 measurements with the oscilloscope, to make a comparison of forms of waves that do not seem quite right?

regards...
I haven't tested this with SMPS yet, I don't have any. I'm using linear supply and noise is negligible when you put your ear on the tweeter. Sound is very good too.. approaching the SQ of most TDA8950/IRS2092 class D amps sold on ebay. (yes i already heard them)

Can you specify what measurement you would like to see? I can't understand your question.

I suggest that you should add additional filtering after your SMPS, material 26 inductor (used in Computer PSU), and HF decoupling caps. That should filter the noise from SMPS. You also have to separate the amp and SMPS at least 1ft away from each other, to reduce interference.
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Old 28th August 2013, 06:02 PM   #19
jory16 is offline jory16  Colombia
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Hello Jlester87, thanks for your response, measures will you make are seen in the capture.

Thank you for your attention.
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Old 29th August 2013, 01:16 PM   #20
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Ok, will take measurements when I have time, meanwhile, can you post your measurements as well so we will have a reference to compare with?
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