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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Need an overview to replace fixed voltage reg with adjustable voltage reg, posted by Cleet Torres on March 19, 2014 at 20:46:20:
Note that Vin, Vout, etc variables being discussed on voltage regulator and voltage divider calculator web pages are generic relative terms which may mean completely different things when used in different contexts.
The voltage divider in your circuit is R1 and R2. In the case of the voltage divider web page you'd use the regulator Vout as the voltage divider calculator Vin. And the voltage divider Vout would be the regulator Vfeedback pin, ie 1.25V or whatever the case may be.
Find a voltage divider that works for you using your 100 ohm party on the bottom side. The tricky part will be combining values you can really purchase to make a Vout you can live with while keeping in mind component operating limits.
A hint might be that an extremely obsessive compulsive would likely look at parallel or possibly even series parallel resistor combos to get the voltage divider tweaked just so.It really depends on your app what makes sense.
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Follow Ups
- RE: Need an overview to replace fixed voltage reg with adjustable voltage reg, - Ugly 21:13:44 03/19/14 (0)
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