Darlington Transistor

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复合管 - Darlington Transistor _ Composite Transistor_3
复合管 - Darlington Transistor _ Composite Transistor_2

Darlington Transistor

A composite tube is a vacuum tube containing more than two electrode systems inside its envelope, where each electrode system independently conducts electron flow to fulfill its own function.
A composite tube is formed by combining two or more triodes in a certain pattern to be equivalent to a single triode, and it is also known as a Darlington tube.
A composite tube is a vacuum tube containing more than two electrode systems inside its envelope, where each electrode system independently conducts electron flow to fulfill its own function.
 
A composite tube is formed by combining two or more triodes in a certain pattern to be equivalent to a single triode, and it is also known as a Darlington tube.
 
The specific connection is as follows: taking two triodes of the same polarity as an example, the collector of the front triode is connected to the collector of the rear triode, and the emitter of the front triode is connected to the base of the rear triode.
 
The power of the front triode is generally smaller than that of the rear triode.
 
The base of the front triode serves as the base of the Darlington tube, and the emitter of the rear triode serves as the emitter of the Darlington tube.
 
It is used in the same way as a triode, and its amplification factor is the product of the amplification factors of the two triodes.
 
  1. Used in high-power switching circuits, motor speed regulation, and inverter circuits.
     
  2. Driving small relays
     
    The circuit for driving high-sensitivity relays from CMOS circuits via Darlington tubes is shown in Figure 1.
     
    The dashed box contains a low-power NPN Darlington tube FN020.
     
  3. Driving LED intelligent display screens
     
    An LED intelligent display screen is a system controlled by a microcomputer and using an LED matrix board as the display unit,
     
    which can display various characters and patterns.
     
    Both row drivers and column drivers in this system can adopt high-β, high-speed, low-voltage-drop composite tubes.
     
    It should be noted that since a composite tube is internally composed of multiple transistors and resistors, the forward and reverse resistance of the be junction measured by a multimeter is different from that of an ordinary triode.