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Information on: LM317
- Programmable Current Source Requires No Power Supply
Engineering labs are usually equipped with various power supplies, voltmeters, function generators, and oscilloscopes. One piece of equipment missing from many such labs, however, is a current source. This omission is unfortunate, because a current source is useful for creating I-V (current-versus-voltage) curves, charging and discharging batteries, preloading power supplies, and many other applications. The circuit in Figure 1 is an easy-to-build, easy-to-use, low-cost current source. It ...
- Control an LM317T with a PWM signal
Set a regulator's output voltage under microprocessor control. Aruna Prabath Rubasinghe, University of Moratuwa, Moratuwa, Sri Lanka; Edited by Martin Rowe and Fran Granville EDN, February 3, 2011 The LM317T from National Semiconductor is a popular adjustable-voltage regulator that provides output voltages of 1.25 to 37V with maximum 1.5A current. You can adjust the output voltage with a potentiometer. The circuit in Figure 1 replaces the potentiometer with an analog voltage that you can ...
- Soft Start PSU
Miroslav Adzic Description Two soft start power supplies. The output voltage slowly increases to the desired output. Notes The output voltage rises slowly and reaches 15 V in 5 seconds. In order to perform this soft-start function, the LM317 voltage regulator IC requires an external universal PNP transistor and the L200 uses its internal comparator (pin 2). After switch-on, the rising voltage on the positive side of the charging electrolytic capacitor slowly turns the (initially conducting) ...
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