What is Darlington Transistor?
Darlington Transistor is a few bipolar transistors connected to the provision of very high -lane profits from a low base. The input transistor emitter is always connected to the base of the output transistor; Their collectors are tied together. As a result, the current amplified by the input transistor is further amplified by the output transistor. Darlington is often used where high profit at low frequency is needed. Common applications include the output phase of the audio amplifier, power controllers, motor controls and display controls.
also known as a pair of Darlington, Darlington Transistor was invented in 1953 by Sidney Darlington in Bell Laboratories. During the 1950s and 1960s it was also called a few super-alpha. Darlington has recognized many advantages of this design for the perimeter of emitors and patented this concept.
Darlington transistor usually with low power, high profit can be very sensitive to small input current changes. Darliz itHot reasons are often used ngtons in contact and light sensors. Photodarlingtons are designed specifically for light sensitive circuits.
The output side is often high -performance, lower profit. With a very high -powerful transistor, the power, inverters and other high -current devices can control. Medium power proposals are often used with the logic of the integrated circuit (IC) for solenoid control, light emitting displays (LED) and other low loads.
Design Transistor Darlington provides several advantages over the use of standard individual transistors. The profit of each transistor in the couple is multiplied together, giving a relatively high current gain. The maximum current of the output transistor collector determines that the steam - it can be 100 or more. Less physical space is required because transistors are often packed in one device. Another advantage is that the fruit of the erAllu can have a very high input impedance.
The transistor generally adheres to the same design rules as one transistor with several restrictions. The voltage of higher voltage and emitter of the base, usually twice the only single transistor, is required. Its shutdown time is much longer because the basic current of the output transistor cannot be actively off. This delay may be reduced by connecting the discharge resistance between the base and the output transistor emitter. However, DARLINGTONS will not be subject to high -frequency applications due to this delay.
saturation voltage of Darlington transistor is also higher, often 0.7 V DC for silicon instead of about 0.2 V DC. This sometimes causes a variance of higher force, because the output transistor cannot feed. At higher frequencies, a larger phase shift is also possible, which can lead to instability in negative feedback.
Darlington Scheme Transistor often depicts a pair of transistor elements together inside a single large circle. The Darlington or Sziklai transistor uses the opposite types of transistors together. If many low -performance pairs are needed in the circuit, IC Darlington field transistor can be used. Drivers often use them because they usually include diodes to prevent spikes when the load is turned off. Many Darlington districts are also designed with pairs of individual discrete transistors connected together.