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Old 21st August 2014, 06:22 PM   #1
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Join Date: Aug 2014
Default power supply for IRS2092S chip amp

Hi everyone,
Very new to the forum. I'm looking into building my own mono car amplifier for a subwoofer based off of the IRS2092 (reference design below):

My concerns at the moment are for the power supply. I skimmed the beginner chip amp section where a 120v step down converter is used to get the dual rail supply for the chip but I only have 12V input to play with in the car (unless I used an inverter to get mains voltages but that seems like an unnecessary detour around the problem).

I need some sort of boost converter to get the +/-35V (looking to try for 350W output power). The question is, I only have experience in building an isolated flyback converter and that was a pain and a half to find the right transformer for the job. I could go the non isolated route and use two single rail inductor based boost converters and cascade them to get +/-35v but it would need to survive the massive input current to get a 350W output.

Question is, am I missing something here? Feels like I can't see an easier way to power this amplifier because I've been over thinking it, I've got tunnel vision haha.

Any suggestions/recommendations/opinions as to how to approach the power supply design stage would be greatly appreciated, thank you!

And apologies if I completely missed a sticky thread that explains my problem.
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Old 25th August 2014, 01:06 AM   #2
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nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
There are quite a few boost converters on ebay.
PCBCAD51 pcb design software. http://murtonpikesystems.azurewebsites.net/
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