Inductance is 3.3µH ±30%, 3.3 - is the value recommended by Infineon in this document https://www.infineon.com/dgdl/Infineon-ApplicationNote_Integrated_Audio_ICs_Merus_EMC_Output_Filter_Recommendations-AN-v01_00-EN.pdf?fileId=5546d46264a8de7e0164b359d78016f6
(Page 5)
Current is 6.8A
Here is the datasheet for this Inductor https://datasheet.lcsc.com/szlcsc/1809172039_Murata-Electronics-1217AS-H-3R3N-P3_C160949.pdf
(Page 5)
Current is 6.8A
Here is the datasheet for this Inductor https://datasheet.lcsc.com/szlcsc/1809172039_Murata-Electronics-1217AS-H-3R3N-P3_C160949.pdf
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Also I add I2C isolator on the plate (ADUM1250), so MA12070p will have galvanic isolation from microcontroller that will be connected via I2C bus.
The main advantge of this chip that it doesn't need radiator for cooling, so user can place it on top of each other and I2S wires will be shorten as much as possible and 3-4 amps system will be really compact.
The main advantge of this chip that it doesn't need radiator for cooling, so user can place it on top of each other and I2S wires will be shorten as much as possible and 3-4 amps system will be really compact.
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Yes, I've ordered it already, but jlcpcb notified me about Chinese holidays till 5th of October, so the shipping will delay for a while.
BTW, you can open the link to easyeda in browser editor, without any software installed on the PC.
Best regards, Alex
In mono configuration you have to connect wires in the same way as pictured in the last page of the document https://www.audiophonics.fr/fr/index.php?controller=attachment&id_attachment=1409 i.e.:
input:
IN0A and IN0B - for the left channel of the mono amp
IN1A and IN1B - for the right channel of the mono amp
output for both amps:
OUT1A => OUT0A => Speaker +
OUT1B => OUT0B => Speaker -
input:
IN0A and IN0B - for the left channel of the mono amp
IN1A and IN1B - for the right channel of the mono amp
output for both amps:
OUT1A => OUT0A => Speaker +
OUT1B => OUT0B => Speaker -
I am using two LED PSU 24V / 150W. They work pretty well and they are stable. I will do a long listening test this week end.
The ON / OFF Switch is out of the PSU (see picture)
I have mine fired up now, running BTL 2.0. Needs trafos to create the inverted channels and they very conveniently allowed me to delete the X5R 10uF input coupling caps which are something of a constraint on the SQ.
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Amplifier is finished and sounds awesome.
1h listening test = fantastic sound stage, really dead silence amp. I will test it more this week but I am really surprised about the amp ) No pop sound, 0 noise.
1h listening test = fantastic sound stage, really dead silence amp. I will test it more this week but I am really surprised about the amp ) No pop sound, 0 noise.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
PMP2 sometimes has lower distortion, mostly though seems PMP1 does a little bit better on THD (though it depends on load impedance). PMP1 is the one recommended for active speakers, presumably it radiates a bit more EMI than PMP2.
The DS is quite involved, its tricky to understand all the ins and outs of 'Power modes' but the default is that the chip will automagically select the most suitable power mode depending on the signal level. It takes a CPU to override the automatic selection.
The DS is quite involved, its tricky to understand all the ins and outs of 'Power modes' but the default is that the chip will automagically select the most suitable power mode depending on the signal level. It takes a CPU to override the automatic selection.