![]() Therefore, to ensure a stable output voltage, you have to drive a current of 5mA and more through the R1-R2 divider. The manufacturers promise that it will average 50 ♚, max 100 ♚, but in real life, it can reach 500 ♚. The second parameter, the current flowing from the trim output, is essentially parasitic. It turns out that the 1.25V at R1 is added to the voltage drop at R2 to form the output voltage. So if resistor R2 is closed, the circuit’s output will be 1.25V, and the greater the voltage drop across R2, the greater will be the output voltage. ![]() The reference voltage is the voltage that the regulator chip tends to maintain at the resistor R1. The value of the reference voltage can vary from instance to instance from 1.2 to 1.3 V, but the average is 1.25 V. The regulator has two important parameters: the reference voltage (Vref) and the current flowing from the tuning pin (Iadj). The LM317T circuit in the minimum version has two resistors, the resistance values determining the output voltage, the input and output capacitors. The input voltage which has to be regulated is given to this pin The regulated output voltage set by the adjusted pin can be obtained from this pin 4 Powerful LM317T Alternatives – LM350 and LM338 LM317T Pinout
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