1、用于大功率开关电路、电机调速、逆变电路。
1. Used in high-power switching circuit, motor speed regulation, inverting circuit.
2、驱动小型继电器
2. Driving small relays
利用CMOS电路经过达林顿管驱动高灵敏度继电器的电路，如图1所示。虚线框内是小功率NPN达林顿管FN020。
The CMOS circuit is used to drive high sensitivity relay through Darlington tube, as shown in Figure 1. Inside the dotted frame is a low power NPN Darlington tube FN020.
3、驱动LED智能显示屏
3. Driving LED Intelligent Display Screen
LED智能显示屏是由微型计算机控制，以LED矩阵板作显示的系统，可用来显示各种文字及图案。该系统中的行驱动器和列驱动器均可采用高β、高速低压降的复合管。应注意的是，复合管由于内部由多只管子及电阻组成，用万用表测试时，be结的正反向阻值与普通三极管不同。对于高速复合管，有些管子的前级be结还反并联一只输入二极管，这时测出be结正反向电阻阻值很接近；容易误判断为坏管，这个请注意。

Intelligent LED display screen is a system controlled by a microcomputer and displayed by an LED matrix board. It can be used to display various words and patterns. In this system, both row driver and column driver can adopt composite tubes with high beta and high speed and low drop. It should be noted that niaosu.07858.netshusongjiw.89ix.comwangdian.89ix.comgelishan.89ix.comchengbao.89ix.com

pentuji.89ix.comthe positive and negative resistance of be junction is different from that of common triode when tested by multimeter because the composite tube is composed of several tubes and resistors. For high-speed composite tubes, some of the pre-be junctions are connected with an input diode in reverse parallel. At this time, the positive and negative resistance values of be junctions are very close. It is easy to be misjudged as a bad junction.