What two components make the Darlington pair?

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 TR1 becomes the base current of the second transistor TR2.

Why is a Darlington connection of three or more transistors usually impractical?

Disadvantages of Darlington Transistor It has a slow switching speed. The base-emitter voltage is almost two times compared to a normal transistor. Due to high saturation voltage, in such an application, it dissipates high power. The bandwidth is limited.

How do Darlington transistors work?

A Darlington transistor acts as a single transistor with high current gain, it means that a small amount of current is used from a microcontroller or a sensor to run a larger load. The below Darlington circuit is built with two transistors shown in the circuit diagram.

What is Darlington pair connection?

In electronics, a multi-transistor configuration called the Darlington configuration (commonly called a Darlington pair) is a circuit consisting of two bipolar transistors with the emitter of one transistor connected to the base of the other, such that the current amplified by the first transistor is amplified further …

What is the need of Darlington pair?

The Darlington pair is inherently relatively slow because the base current for the output transistor cannot shut off instantly. As a result Darlington pairs are generally used in low frequency applications including in power supplies or areas where a very high input impedance is needed.

What does Darlington transistor do?

How does a Darlington pair work?

A Darlington Pair acts as one transistor but with a current gain that equals: Total current gain (hFE total) = current gain of transistor 1 (hFE t1) x current gain of transistor 2 (hFE t2) So for example if you had two transistors with a current gain (hFE) = 100: (hFE total) = 100 x 100 (hFE total) = 10,000 You can see …

What is a Darlington pair of transistor?

Circuit diagram of a Darlington pair using NPN transistors. In electronics, the Darlington transistor (commonly called a Darlington pair) is a compound structure of a particular design made by two bipolar transistors connected in such a way that the current amplified by the first transistor is amplified further by the second one.

What is the overall current gain of a Darlington pair?

This transistor behaves as a single unit transistor as it has only one emitter, collector, and base. The Darlington transistor was invented by Sidney Darlington in 1953. If the current gain of a transistor is β1 and β2, the overall current gain of Darlington pair is β1β2.

What is a dardarlington pair?

Darlington Pair ; is a name given to a cascaded set of transistors both being of the same type, say NPN or PNP. This configuration basically amplifies the input at the ‘base of configuration’ and that results in a very large current in the emitter collector circuit.

How many Darlington pairs are in an integrated circuit?

Integrated Darlington pairs come packaged singly in transistor-like packages or as an array of devices (usually eight) in an integrated circuit . A third transistor can be added to a Darlington pair to give even higher current gain, making a Darlington triplet.