Darlington Pair Transistor Circuit

In this circuit the voltage between base and emitter is just that of a single transistor in contrast to that of a conventional darlington pair circuit. How a darlington pair transistor works a darlington pair is two transistors that act as a single transistor but with a much higher current gain.

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Schematic Diagram Of The Conventional Darlington Pair

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Although the darlington pair has some limitations it is nevertheless used in many areas especially where high frequency response in not needed.

Darlington pair transistor circuit. Q 1 the left hand transistor in the diagram can be a low power type but normally q 2 on the right. This mean that a tiny amount of current from a sensor micro controller or similar can be used to drive a larger load. Integrated darlington pairs come packaged singly in transistor like packages or as an array of devices usually eight in an integrated circuit.

A darlington transistor is a back to back connection of two transistors that comes as a complete package with three leads base emitter and collector as equivalent to the single transistor. The pair of bipolar transistors provides a very high current gain as compared with single standard transistor as mentioned above. We will calculate the base current for switching the load.

Darlington pairs are available as integrated packages or can be made from two discrete transistors. The darlington transistor pair is a very useful circuit in many applications. Sziklai transistor pair was first designed by george sziklai to overcome some efficiency related issues with darlington pair which will be discussed later in this articleit is also known as compound or pseudo darlington pairthis transistor pair consists of two bipolar transistor pairs where one is npn and another is pnp.

A darlington transistor configuration also known as a darlington pair or super alpha circuit consist of two npn or pnp transistors connected together so that the emitter current of the first transistor tr 1 becomes the base current of the second transistor tr 2. A 60w load with 15v input voltage needs to be switched using two npn transistors creating a darlington pair. In these circuits the darlington pair may be a single device containing the integrated darlington or they can be circuits that are made from the discrete transistors.

It provides a high level of current gain which can be used in many power applications. The first transistor gain will be 30 and the second transistor gain will be 95. Circuits used in association with light sensor audio amplifiers and power supplies are some common examples of circuits using darlington pair transistors.

A darlington pair is two transistors connected together so that the current amplified by the first is amplified further by the second transistor. One example is the complementary darlington pair circuit using both a npn and a pnp transistor sometimes called the sziklai pair. The pair behaves like a single transistor with a very high current gain so that only a tiny base current is required to make the pair switch on.

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