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Old 12th November 2009, 01:10 PM   #1
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Default chip amp with 12v DC AND 240v AC power supplies?

Hi guys.

I'm interested in building a chip amp (maybe Hypex ucd 400) which has the capability to run from 12volt DC power (lead acid batteries) and also from 240volt Ac (uk mains). While maintaining high efficiency operation and safety.

Is it possible for a semi beginner? How would you go about it?
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Old 12th November 2009, 02:52 PM   #2
ratza is offline ratza  Romania
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Hi. I would make a normal amplifier with 240/12V transformer and then add a connector after the diode bridge to allow connection at e.g. the car's battery. A relay can be added to decouple the battery if the amp is powered from the mains.
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Old 12th November 2009, 08:53 PM   #3
Pentode is offline Pentode  United Kingdom
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Here's the UCD400 pdf data sheet and you wanna run it of 12Volts..... gee I've missed the boat, this beast can eat 400W with a 4 ohm load!

Dave
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Old 12th November 2009, 09:17 PM   #4
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2 problems, the Hypex modules run off bipolar supplies +ve & -ve and the minimum voltage is ±45V. I think you have to go Tripath (T-amp) for 12V single supply.
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Old 12th November 2009, 11:15 PM   #5
Eva is offline Eva  Spain
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A SMPS is required in order to get enough internal supply voltage for decent power output with 12V input.
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Old 13th November 2009, 01:53 AM   #6
star882 is offline star882  United States
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Use a power supply with an output voltage of 14.4v, then use a boost converter or push pull converter to increase it to what you want. It will also work as a charger.
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Old 13th November 2009, 03:28 PM   #7
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Ok, So I guessed this would be a little complex. Most of that went over my head.

Quote:
the Hypex modules run off bipolar supplies +ve & -ve and the minimum voltage is 45V. I
So does that mean that the Hypex modules are not suitable for 12v dc operation without....

Quote:
a boost converter or push pull converter to increase it to what you want
??

is that the same as an SMPS? Or is an SMPS just a type MOSFET?

I'm sorry that I only have a rudimentary understanding of this stuff. I just need to know if if it is possible (hypex or tripath)without losing loads of efficiency on the 12v side. If it is possible then I will have a reason to sit down and learn about it in depth. Thanks everyone for helping.
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Old 13th November 2009, 03:38 PM   #8
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If you want it to work off a single 12V supply you need to use the Tripath amps.

The hypex amps will require a Switched Mode Power Supply to step up the +12V to +45V and also invert it to -45V.

I don't know of any SMPS that can accept 12VDC to 240AC and output ±45V
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Old 13th November 2009, 03:41 PM   #9
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see this thread here:
Sure Electronics New Tripath Board tc2000+tp2050

but you won't get the full 100W per from a 12V supply. More like 18W into 4ohms and 9W into 8ohm.
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Old 13th November 2009, 07:07 PM   #10
Eva is offline Eva  Spain
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Take a look at TDA1560 and TDA1562:

http://www.nxp.com/acrobat_download/...TDA1560Q_4.pdf

http://www.nxp.com/acrobat_download/...2Q_ST_SD_2.pdf

And I found this too while I was looking if it was still available:
http://cgi.ebay.es/70W-high-efficien...mZ250343501225
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Last edited by Eva; 13th November 2009 at 07:15 PM.
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