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'Programmable PSU: boosted opamp or linear voltage '
2005\05\06@035752 by Russell McMahon

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> I'd like to design for my own use a 5A laboratory power supply, and
> control it digitally, via a DAC (not a digital potentiometer, since

> ...it, and the more I'd rather prefer (intuitively/instinctively at
> least)
> a boosted opamp solution instead.

For a lab supply I like the idea of a power supply that sucks as well
as blows so boosted op-amp sounds good.

Consider using a DC coupled amplifier designed for audio amplifier
solutions. Lowish cost for the power.

More anon perhaps.


       RM

2005\05\06@172830 by Peter

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On Fri, 6 May 2005, Russell McMahon wrote:

>> I'd like to design for my own use a 5A laboratory power supply, and
>> control it digitally, via a DAC (not a digital potentiometer, since
>
>> ...it, and the more I'd rather prefer (intuitively/instinctively at least)
>> a boosted opamp solution instead.
>
> For a lab supply I like the idea of a power supply that sucks as well as
> blows so boosted op-amp sounds good.

Except the current limiting becomes interesting in this configuration.
Usually you want adjustable current limiting (different for sink &
source).

> Consider using a DC coupled amplifier designed for audio amplifier solutions.
> Lowish cost for the power.

Yes but see above. I have put a few hours into lab work related to this
and it is not so easy imho. Relatively wideband audio amps will
oscillate easily when used with a reactive load (f.ex. small dc motor or
solenoid). The funny things that must be done to obtain adjustable
current limiting do not help at all with this. I could not make a
'simple' circuit that satisfies all the requirements from existing
(integrated) audio amps.

Instead, I used a 'classic' linear power supply scheme and a separate
'class A' adjustable sink (adjustable only in current but shunt type
voltage regulation can be added easily). The main features were the
heatsinks ... my supply was max 100W (3A @ 30V).

Peter

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