(Datasheet) LM317T data sheet PDF





LM317T Datasheet, Variable Voltage Regulator

LM317T   LM317T  

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LM317T Variable Voltage Regulator The LM 317T is a adjustable 3 terminal positiv e voltage regulator capable of supplyin g in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device a lso has built in current limiting and t hermal shutdown which makes it essentia lly blow-out proof. Output voltage is s et by two resistors R1 and R2 connected as shown below. The voltage

LM317T Datasheet, Variable Voltage Regulator

LM317T   LM317T  
across R1 is a constant 1.25 volts and the adjustment terminal current is less than 100uA. The output voltage can be closely approximated from Vout=1.25 * ( 1+(R2/R1)) which ignores the adjustment terminal current but will be close if the current through R1 and R2 is many t imes greater. A minimum load of about 1 0mA is required, so the value for R1 ca n be selected to drop 1.25 v








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