Set the output voltage of an LM317 (positive) or LM337 (negative) regulator. · in Power Supply
adjustablesupply
Set the output voltage of an LM317 (positive) or LM337 (negative) regulator. Enter Vin, target Vout and R1 to find R2; or enter R1 and R2 to find the actual Vout. Also calculates IC dissipation and estimated junction temperature -the part people skip.
Adjustable Regulator — ± dual-rail LM317/LM337 circuit and pinoutsAdjustable Regulator — Positive rail, R2 solved from target Vout
How to use
What it's for
LM317 family: set Vout, size R2, and find out whether the IC survives the heat. Negative rails (LM337) supported.
You enter
Input voltage, target output, R1, load current, ambient temperature and heatsinking.
You get
The R2 value for your target, the actual output it produces, IC dissipation, and the estimated junction temperature — with a warning when the regulator will run too hot.
