Where β 1 and β 2 are the gains of the individual transistors. As we know,Īs shown, the base current, I B2 is equal to transistor T1 emitter current, I E1 as the emitter of T1 is connected to the base of T2. Calculation of Collector current:Ĭollector current is calculated in terms of gains of the individual transistor. Hence, this configuration achieves the β multiplication for the base current (I b) and the collector current (I c).
Let’s take an example of NPN Darlington pair amplifier as shown in the figure above, the collectors of two transistors are connected together and the emitter of T1 drives the base of T2.
PNP Darlington Transistor NPN Darlington Transistor Then the transistor T1 is connected as an emitter follower and transistor T2 as a common emitter amplifier. Into this, the two NPN transistors or PNP transistors are connected together in such a way so that the emitter current of the first transistor T1 become the base current of the second transistor T2. Related Useful Guides: Transistor basics Transistor operation Transistor characteristics Transistor configurations Transistor oscillator circuit common emitter amplifier Darlington Transistor Configurationĭarlington transistor configuration is also known as Darlington pair or super alpha circuit. He introduced the idea of having two or three transistors on a single chip sharing a collector. In this arrangement, the emitter of the first transistor is connected to the base of the second one to produce a more sensitive transistor with a much larger current gain. This transistor was invented by Bell Laboratories engineer, Sidney Darlington in 1953. What is Darlington Transistor Advertisementsĭarlington transistor consists of two bipolar transistors is connected in such a way that the current amplified by the first transistor is amplified further by the second one. One of them is Darlington Transistor. Here we are going to explain you Darlington transistor switch, its configuration, and applications in detail. But there are many other transistors that are invented by the uses of Bipolar Transistors. We have already learned about main types of transistors and Transistor configuration.
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