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f-alpha.net » Electronics » Integrated Circuits » Voltage Regulator » Let's go... » Experiment 14 - Adjustable VR III

Experiment 14 - The Adjustable Voltage Regulator LM317 III

Suppose you want an output voltage Vout = 5 V. For this you use the formula...

Vout = 1.25 × (1 + R2/R1) + (0.00005 × R2)

As the the resistor R1 you usually choose a resistance in the range of several hundred Ω. Hence R1 = 220 Ω is a good choice.

Now you can use this in the formula, and you get...

R2 = (Vout - 1.25) / 0.00573

Since you want an output voltage Vout = 5 V...

R2 = 655 Ω

Circuit diagram voltage regulation of the LM317 with an output voltage Vout = 5V.

Circuit voltage regulation of the LM317 with an output voltage Vout = 5V. (Enlarge)

In the next experiment you look again at the heat generation of the voltage regulator...

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