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'[OT] 0-10V 100mA supply'
2012\04\16@180807 by alan smith

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As the description says....0-10V @100mA, input is 24VDC

So the way I see choices are:

Micro with PWM output driving an opamp (+24VDC rails...cable driver maybe?)

DAC driving a opamp again

Adjustable LDO - using a digital pot to adjust the ouput (micro drives over I2C)


So what might the forum choose?  

2012\04\16@183943 by Wouter van Ooijen

face picon face
On 17/4/2012 12:08 AM, alan smith wrote:
> As the description says....0-10V @100mA, input is 24VDC
>
> So the way I see choices are:
> Micro with PWM output driving an opamp (+24VDC rails...cable driver maybe?)
> DAC driving a opamp again
> Adjustable LDO - using a digital pot to adjust the ouput (micro drives over I2C)

At 0.1 V / 100 mA you are dissipating 2.4W. Not your yellybean OpAmp!

Buck converter?

--
Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
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2012\04\17@043603 by alan.b.pearce

face picon face
> As the description says....0-10V @100mA, input is 24VDC
>
> So the way I see choices are:
>
> Micro with PWM output driving an opamp (+24VDC rails...cable driver maybe?)
>
> DAC driving a opamp again
>
> Adjustable LDO - using a digital pot to adjust the ouput (micro drives over I2C)
>
>
> So what might the forum choose?

At that input voltage I would research buck regulators designed for PoE  or automotive use ...


-- Scanned by iCritical.

2012\04\17@084427 by Spehro Pefhany

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At 06:08 PM 4/16/2012, you wrote:
>As the description says....0-10V @100mA, input is 24VDC
>
>So the way I see choices are:
>
>Micro with PWM output driving an opamp (+24VDC rails...cable driver maybe?)
>
>DAC driving a opamp again
>
>Adjustable LDO - using a digital pot to adjust the ouput (micro
>drives over I2C)
>
>
>So what might the forum choose?

Easier if you can relax the spec to something more like 1.5-10V, otherwise having
a negative supply might be better.

Digital pot (or DAC) and regulator is easy.. you don't need an LDO since
you have plenty of input voltage. If you knock the 24V down to 12V first
with a buck regulator then use a linear (eg. LM317) that would not be a bad
solution. Only a small heat sink required on the LM317 (1.2W), and relatively
low noise. You get the short-circuit and thermal overload protection
included.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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