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Old 6th September 2006, 06:51 AM   #1
xiaonan is offline xiaonan  China
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Default need a high voltage operational amplifier!

I want to set up a digital controled voltage supply. I need a high voltage operational amplifier which can provide 0~100V output voltage at lease. But I can not find a op-amp like that?

Is there someone know some op-amp about that? Or know some circuit can get the same result?

Thank a lot!!!
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Old 6th September 2006, 07:38 AM   #2
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Default Re: need a high voltage operational amplifier!

Quote:
Originally posted by xiaonan
I want to set up a digital controled voltage supply. I need a high voltage operational amplifier which can provide 0~100V output voltage at lease. But I can not find a op-amp like that?

http://eportal.apexmicrotech.com/mai...linvoltage.asp

is your friend!
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Old 6th September 2006, 07:50 AM   #3
lineup is offline lineup  Sweden
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Default Re: Re: need a high voltage operational amplifier!

Quote:
Originally posted by xiaonan
I want to set up a digital controled voltage supply. I need a high voltage operational amplifier which can provide 0~100V output voltage at lease. But I can not find a op-amp like that?

Is there someone know some op-amp about that? Or know some circuit can get the same result?

Thank a lot!!!

Quote:
Originally posted by diy_audio_fo



http://eportal.apexmicrotech.com/mai...linvoltage.asp

is your friend!
It is NOT easy to find such OP-Amps.
They exsists, but the demand is limited, so difficult to find.

APEX as mentioned, is wellknown to have those circuits
at a somewhat higher price.

My own approach, because I have the knowledge
would be a custom discrete OP-Amp for your project
using higher voltage transistors.


Search google:
"discrete op amp" "high voltage"

http://www.google.se/search?q=%22dis...igh+voltage%22


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lineup

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Old 7th September 2006, 06:45 AM   #4
glennb is offline glennb  Australia
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Default Re: need a high voltage operational amplifier!

Quote:
Originally posted by xiaonan
I want to set up a digital controled voltage supply. I need a high voltage operational amplifier which can provide 0~100V output voltage at lease. But I can not find a op-amp like that?
Is there someone know some op-amp about that? Or know some circuit can get the same result?
Thank a lot!!!
Consider the LM4702 - Stereo High Fidelity 200 Volt Driver with Mute at http://www.national.com/pf/LM/LM4702.html. There are several threads in this forum on its use as an audio power amp output stage driver. There is no reason why it couldn't be used in a power supply.
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Old 7th September 2006, 03:37 PM   #5
Leolabs is offline Leolabs  Malaysia
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Old 7th September 2006, 04:16 PM   #6
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Default Re: Re: need a high voltage operational amplifier!

Quote:
Originally posted by glennb


Consider the LM4702 - Stereo High Fidelity 200 Volt Driver with Mute at http://www.national.com/pf/LM/LM4702.html. There are several threads in this forum on its use as an audio power amp output stage driver. There is no reason why it couldn't be used in a power supply.
It can only source or sink a few mA if used on its own -- and is pretty expensive for this purpose --

The circuit below is, essentially, that which appears in the Art of Electronics -- and it works -- I have used it with AD811, AD825, LT1013 etc., as the error amplifier -- it can also be configured as a negative side regulator. It uses a Voltage DAC on the input -- the potentiometer controls the gain of the loop. You will have to figure out the values of compensation capacitors for yourself since I just plugged these in to see the affect on loop response.
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Old 7th September 2006, 04:37 PM   #7
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http://www.edn.com/article/CA45890.html

Have a look at this. It talks about bootstrapping op-amps to have a larger voltage swing.
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