electricpy.lm317¶

electricpy.lm317(r1, r2, v_out)[source]¶

LM317 linear voltage regulator solver.

The LM317 is a linear voltage regulator that can be adjusted to supply a specific output voltage. The LM317 has three pins, adjust, output and input. The LM317 is often connected as in the image below. [1]

Formula to Calculate Output Voltage, R1, R2:

\[V_{out} = 1.25 * (1+\frac{R2}{R1})\]

\[R1 = \frac{1.25*R2}{V_{out}-1.25}\]

\[R2 = \frac{R1*V_{out}}{1.25 - R1}\]

Parameters:¶

v_out : float, Optional¶

Output Voltage in LM317 in Volts

r1 : float, Optional¶

r1 is resistance and is measured in ohm

r2 : float, Optional¶

r2 is resistance and is measured in ohm

Returns:¶

• v_out (float) – v_out is the output voltage and is measured in volt (V)

• r1 (float) – r1 is resistance and is measured in ohm

• r2 (float) – r2 is resistance and is measured in ohm

[1]

Electronial, “LM317” BasicTables, Accessed May, 2022 https://www.basictables.com/electronics/lm317