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Chip Amps Amplifiers based on integrated circuits

LM3886 Current Requirments
LM3886 Current Requirments
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Old 22nd April 2006, 01:18 PM   #1
Zero Cool is offline Zero Cool  United States
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Default LM3886 Current Requirments

I am just starting to get into these chip amps. I have an application where i want to use them. My BMW Stock amplifier uses 10 amplifier channels on 5 chip amps running from the 12V supply, no switcher inside. I am wanting to rebuild something similar using LM3886 amps.

What sort of current is required for these amps under full power @ 4 ohms???

I need to find or build power supply for the project.



Dave
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Old 22nd April 2006, 04:28 PM   #2
Nordic is offline Nordic  South Africa
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these chips are rated at about 11A if memory serves correctly...
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Old 22nd April 2006, 05:00 PM   #3
jaudio is offline jaudio
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If I did the math right,I think it is 5.8A

checkout datesheet page 20
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Old 22nd April 2006, 09:22 PM   #4
cpemma is offline cpemma  United Kingdom
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Your best bet is to get the Overture design spreadsheet and play about. It shows current demands among other things like heatsinks, fb resistors & stuff.
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Old 23rd April 2006, 11:21 PM   #5
Nordic is offline Nordic  South Africa
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68W over 4 ohms at 28V...7A
50W over 8 ohms at 35V...4.4A
This however not the max rateing of the chip
MAX output current limit will be between 7 and 11.5A difering from chip to chip
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Old 23rd April 2006, 11:35 PM   #6
tiltedhalo is offline tiltedhalo  United States
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Default current requirments

The current will not be an issue, you will have to make a swtich mode supply to get the voltage up from +12V to something more usable like +/-30VDC. At the 12V from the car battery you will have to have one non-inverted single ended chip and an inverted single ended chip bridged then you will get a 24 volt swing minus loss, for about 18 to 22 watts +or- alittle. You would probably be better of with the orignal TDA chips already built............
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