Where Darlington pair is used?

Where Darlington pair is used?

Darlington pairs are often used in the push-pull output stages of the power audio amplifiers that drive most sound systems.

What is a Darlington transistor array used for?

Two electronic transistors can be connected to form a Darlington transistor (sometimes called a Darlington pair), which can switch much more current than the collector-emitter circuit of a standard transistor can.

How does 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 main function of Darlington transistor?

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.

What is the advantage of darlington emitter follower circuit?

Relatively high current gain and power gain. High input impedance and low output impedance. Input and output ac voltages are in phase.

Which circuit uses photo darlington devices?

The photo-transistor and photo-darlington devices are mainly for use in DC circuits while the photo-SCR and photo-triac allow AC powered circuits to be controlled. There are many other kinds of source-sensor combinations, such as LED-photodiode, LED-LASER, lamp-photoresistor pairs, reflective and slotted optocouplers.

What is darlington?

Wiktionary. Darlingtonnoun. A pair of transistors with the emitter of one connected to the base of the other and the collectors connected together, acting as a transistor with greater amplification.

What is darlington emitter follower?

A darlington emitter follower is two transistors operating as one. In other words, a pair of bipolar transistors Page 22 combined together to make a single Darlington transistor pair can be regarded as a single transistor with a very high value of β and consequently a high input resistance.

What are the advantages of Darlington pair audio amplifier?

Benefits or advantages of Darlington transistor ➨It offers very high current gain in comparison to single transistor. ➨It offers very high input impedance. ➨It uses few components and hence can be used for easy circuit designs. ➨It can amplify signal to larger extent.

What are the advantages of Darlington transistor as a single package?

Advantages of Darlington Transistor The main advantage of a Darlington transistor is the high current gain. So, a small amount of base current can trigger the transistor. It offers high input impedance which translates into an equal decrease in output impedance. It is a single package.

What are the advantages of a Darlington pair?

What is Darlington emitter follower?

How is the Darlington pair used in electronics?

The Darlington transistor pair is a very useful circuit in many applications. It provides a high level of current gain which can be used in many power applications. Although the Darlington pair has some limitations, it is nevertheless used in many areas, especially where high frequency response in not needed.

What are the drawbacks of the Darlington pair?

Another drawback of the Darlington pair is its increased “saturation” voltage. The output transistor is not allowed to saturate (i.e. its base–collector junction must remain reverse-biased) because the first transistor, when saturated, establishes full (100%) parallel negative feedback between the collector and the base of the second transistor.

Can a PNP transistor be used as a Darlington pair?

PNP Darlington Transistor as Switch. We can make use of PNP transistors as Darlington pair, but most commonly NPN transistors are used. There is no much difference in the circuit using NPN or PNP. Below figure shows a simple sensor circuit which gives an alarm with the functioning of Darlington pair.

What is the base current of a Darlington pair?

Hence, the value of the base current in the case of the Darlington pair is 2.5mA. And this current is sufficient to draw by a microcontroller. In this way, we can run the same load with the same microcontroller, if we use Darlington transistor as a switch.