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Old 16th September 2009, 05:24 PM   #1
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Join Date: Jun 2008
Default Regulator LD1085V Question

The data sheet (page 4) for the LD1085 gives the following equation for calculating resistance for the resistor that sets the Output voltage:

Vo=Vref (1-(R2/R1))

Simple enough.

What's Vref???

I know it's something embarasingly obvious but I can't see it.

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Old 16th September 2009, 05:31 PM   #2
Gordy is offline Gordy  United Kingdom
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For most regulators it is 1.25V.
I am surprised that they omitted such information from the datasheet.
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Old 16th September 2009, 05:37 PM   #3
Nisbeth is offline Nisbeth  Denmark
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Location: Denmark
You're right that isn't actually in the datasheet It is 1.25V though (look at the DS for the LT1085 or even the LM317 to find the specs.)

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Old 16th September 2009, 08:18 PM   #4
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Thanks guys. I knew that was true of the LM317 but I didn't think it necessarily followed that it would be true of this regulator. I appreciate the help.
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