Rumus

TL431 (ref,A,K)
Vo = Vref(1+R1/R2)
V = 2.5V * (1 + R1 / R2)
A R2 Ref R1 K
Gnd-R2-Ref-R1-Vout

LM317 (Ajd-Vo-Vi)
VOUT = 1.25 ( 1 + R2/R1 )
R2 potensio
LM317 = 1,5A
LM350 = 3A
LM338 = 5A
Output Voltage : 1.2V - 37V
Input Voltage : 4.2V - 40V