![]() This is an adjustable high current regulator circuit that the output voltage can be adjusted using a 5K potentiometer. Current Boosting Using a PNP Power Transistor (MJ2955)įigure-1 shows the schematic diagram of the circuit. This problem can be solved using a pass power transistor. It is intended for power switching circuits,series and shunt regulators, output stages and high fidelityamplifiers.TO-3ABSOLUTE MAXIMUM RATINGS ( Ta25C ,unless otherwise specified )PARAMETERS SYMBOL VALUE UNITSCollector-Base. Overload protection remains functional even if the ADJUST terminal is disconnected.” This information proves to us that this cheap 3-terminal device is suitable for many applications but it comes with a drawback for power applications and that is the limitation of the regulator’s output current handling (1.5A in the best conditions). UTC 2N3055 SILICON NPN TRANSISTORSILICON NPN TRANSISTORS The UTC 2N3055 is a silicon NPN transistor in TO-3metal case. It includes current limiting, thermal overload protection, and safe operating area protection. The device features a typical line regulation of 0.01% and a typical load regulation of 0.1%. It requires only two external resistors to set the output voltage. In this article, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors.Īccording to the LM317 datasheet: “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 37 V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. The output voltage of the regulator can be adjusted from 1.25V to 35V. ![]() LM317 is one of the most popular adjustable regulator chips.
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