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Old 31st January 2005, 01:03 AM   #1
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Default Using 2 chips to boost voltage handling

If I remember correctly, isn't there some way to hook two chips together to allow double the power supply voltage? What I want to do is power an OPA549 above +/-30 to allow higher voltage output and therefor higher wattage output.

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Old 31st January 2005, 06:06 AM   #2
loong is offline loong  United Kingdom
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Do you mean the bridge config? If so, you can see the AN-1192 App Note for some detail.
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Old 31st January 2005, 11:31 AM   #3
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Bridging will increase the voltage seen by the speaker, but not allow you to increase the psu rails, so you will still need the same transformer.
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Old 31st January 2005, 11:42 AM   #4
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Also bear in mind that bridging causes the load seen by the amp to halve, thus you will be limited to 8 ohm speakers with most chips.
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Old 31st January 2005, 11:42 AM   #5
boholm is offline boholm  Denmark
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If you give your OPA549 more than +/- 30 volts, it will be destroyed.

Bridging is the trick to use: http://sound.westhost.com/bridging.htm
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Old 31st January 2005, 11:51 AM   #6
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how about runing one chip on +60v and a nother at -60v, and running them as bridged?

just a quick thought from the top of my head..
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Old 31st January 2005, 12:05 PM   #7
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Then you will have a nice 60 volt DC offset going though your voice coil and a nasty smell in the room, if not flames
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Old 31st January 2005, 04:34 PM   #8
azira is offline azira  United States
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Quote:
Originally posted by demogorgon
how about runing one chip on +60v and a nother at -60v, and running them as bridged?

just a quick thought from the top of my head..
not bridged, parallel... I had an idea like this more than once. Probably need diodes in the output of each amp to prevent them from driving eachother... also would have to deal with crossover distortion.
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Old 31st January 2005, 04:40 PM   #9
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Quote:
Originally posted by azira


not bridged, parallel... I had an idea like this more than once. Probably need diodes in the output of each amp to prevent them from driving eachother... also would have to deal with crossover distortion.

As Loong said: you can see the AN-1192 App Note for some detail.

It has been discussed, builded and tested through people from this forum...and...you can find AN-1192 at the website of national, I think it is www.national.com
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Old 31st January 2005, 04:55 PM   #10
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Quote:
Originally posted by ErikdeBest



As Loong said: you can see the AN-1192 App Note for some detail.

It has been discussed, builded and tested through people from this forum...and...you can find AN-1192 at the website of national, I think it is www.national.com

AN-1192 isn't going to help much is this situation.
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