![]() Load current = Current gain (β) × base current Transistor gain or Current gain (β) = load or collector current/ input or base current The current gain or beta of a transistor is the ratio of collector current to base current. Darlington TransistorīACK TO TOP Why We Use Darlington Transistor?Īs we know that to drive the transistor into the conduction mode a small base current is required, when the base is connected as input, emitter as common and collector as the output.īut, when we consider the load at the collector terminal, this small base current may not enough to drive the transistor into conduction. Let us look in brief about this transistor with applications. Many opto-isolator circuits are made with Darlington transistors to have high current capacity at the output stage. These transistors are found in different types of applications such as power regulators, motor controllers, audio amplifiers, etc. In today’s market, wide variety of Darlington transistors are available that are varied by polarity, collector current, power dissipation, package type, maximum CE voltage and so on. Darlington configuration was invented by Sidney Darlington in the year of 1953. Example of Darlington Transistor CircuitĪ Darlington transistor or simply Darlington pair is mainly used to offer a very high current gain even with low base current. ![]() ![]() Darlington Transistor or Darlington Pair. ![]()
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