Vout: Target Output Voltage 1.5 to 37.0 Volts R1: R1 Resistor Value 100-1000 Ohms R2: Click Calculate to display the calculated R2 value here. Simply enter your target output voltage Vout and chosen value for R1 (100 to 1000 Ohms), click Calculate, and the required value of R2 will be displayed. The output voltage from the LM317 and LM338 is set using two ( R1 and R2) with their values chosen according to the following equation: V OUT = 1.25 * ( 1 + R2/R1 ) REUK LM317/LM338 Voltage CalculatorBelow is our automated voltage calculator for the LM317 and LM338 regulators. 5 LM317 SLVS044X –SEPTEMBER 1997–REVISED SEPTEMBER 2016 Product Folder Links: LM317. RθJC(bot) Junction-to-case (bottom) thermal resistance NA 0.1 4.2 1.1 ☌/W. The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to.
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