What is a Darlington transistor? The basic structure, characteristics, working principle, applications, causes of faults, maintenance methods, and development history of Darlington transistors 1

Darlington transistor is a special EP1C20F400C8N amplifier circuit composed of two cascaded transistors. It consists of two cascaded NPN or PNP transistors, with one transistor's emitter connected to the base of the other transistor and the collector connected to the output terminal. The following is a detailed introduction to Darlington transistors.

1、 Basic structure:

A Darlington transistors is composed of two cascaded transistors, one of which is called the input stage and the other is called the output stage. The emitter of the input stage is connected to the base of the output stage, while the collector of the output stage is connected to the output terminal. This cascade structure enables Darlington transistors to have high current amplification and low input resistance.

2、 Characteristics:

1. High current amplification factor: Due to the cascaded structure, the current amplification factor of Darlington transistor is relatively high, which can reach hundreds to thousands of times.

2. Low input resistance: The emitter of the input stage is connected to the base of the output stage, resulting in a lower input resistance of the Darlington transistor, which can reduce the voltage drop between the signal source and the amplifier.

3. High output resistance: Due to the cascaded structure, the output resistance of the Darlington transistors is relatively high, which can provide a larger output current.transistors

4. High gain bandwidth product: Darlington transistors have a high gain bandwidth product and are suitable for high-frequency amplifier circuits.