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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th October 2005, 02:30 AM   #1
homer09 is offline homer09  Canada
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Question 6 channel class-d amp for car, need guidance...

Im usually around the chip amps forum, but ive decided to come to you guys for this project.

i need efficiency for my amp, so class-d is really attractive. now i would like some basic guidance. i have experience with chip amps, and im wondering if a class-d amp is just as easy to build? (im really hoping)

this amp of course will have to run off a +12V battery. right now im thinking switching power supply to provide enough voltage, but they are next to impossible to build and hard to source. any ideas for powering a 6 channel class-d?

oh as for power requirements, i want a quality 25+ watts per channel. but that number is not set in stone.

are there any kits out there suited for me. i dont wanna spend huge amounts, budget for total amp is in the couple of hundreds max.

thanks guys.
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Old 5th October 2005, 07:17 PM   #2
homer09 is offline homer09  Canada
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anyone? any help would be appreciated, is there a kit for class-d which is the equivalent of Brians kits for class AB chipamps?
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Old 5th October 2005, 09:13 PM   #3
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Hi,

There's a few chip solutions you can look into, you're not going to find a ready made kit, unless maybe you look at the stuff from 41hz.com, however, anything and everything is going to come up to alot more than a few hundred for a six channel amp, I don't think you could do it for a two channel amp at that price. It's just unrealistic to even consider it for that little.

Also, building your own instead of getting a kit is very tricky and will cost even more.

Cheers,
Chris
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Old 6th October 2005, 03:30 AM   #4
homer09 is offline homer09  Canada
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thanks for the reply. i am seeing that class d is not nearly as economical as good old gainclones...

the amp3 from 41hz.com looks very interesting. its designed to run off a car battery which eliminates my power supply woes. but the power is quite low.

are these amps bridgeable for more power?
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Old 6th October 2005, 03:15 PM   #5
homer09 is offline homer09  Canada
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digikey doesnt seem to carry anything tripath...

where can i buy tripath chips such as the TAA4100A??
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Old 6th October 2005, 06:14 PM   #6
john65b is offline john65b  United States
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Default perfect timing

Try looking here for a Tripath TA2020-020 6 channel solution......

http://suburbansurvey.no-ip.org/tripathamp.htm

Thanks
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Old 6th October 2005, 07:22 PM   #7
homer09 is offline homer09  Canada
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Default Re: perfect timing

Quote:
Originally posted by john65b
Try looking here for a Tripath TA2020-020 6 channel solution......

http://suburbansurvey.no-ip.org/tripathamp.htm

Thanks

wow thats an excellent lead, thank you!
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Old 6th October 2005, 07:30 PM   #8
homer09 is offline homer09  Canada
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Actually looking again, i would still prefer the TAA4100A chip and maybe etch my only pcb or p2p it.

anyone know where to source just the chips?
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Old 6th October 2005, 08:32 PM   #9
JZatopa is offline JZatopa  United States
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Your main problem is designing a smps to run off of 12V. IF you know how to design a smps then you can just plug in a premade class D amp design.
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Old 7th October 2005, 01:42 PM   #10
homer09 is offline homer09  Canada
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Quote:
Originally posted by DJNUBZ
Your main problem is designing a smps to run off of 12V. IF you know how to design a smps then you can just plug in a premade class D amp design.

yes you are right. even with the efficiency of class D, i dont think i could get the power overhead i want without an SMPS.

i was looking around, and ive found some for sale. but i dont know how they sound or if they are even appropriate for audio.

What do you suggest is the best path for getting a working SMPS? are there any DIY kits or solutions out there? can i find a chip and just follow the datasheet?
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