Efficient and reliable power switches and driver chips

Source switch and driver chip is an indispensable part of electronic equipment, they can control the power switch and motor rotation, to ensure the normal operation of electronic equipment. With the development of electronic devices, the performance and reliability requirements of power switch and driver chips are getting higher and higher, so it is becoming more and more important to develop efficient and reliable power switch and driver chips. This paper will introduce the basic principle, classification, design points and application fields of power switch and driver chips.

Ⅰ, The power switch

1. Basic principles

A power switch is a circuit used to control the power supply to turn on and off. In electronic devices, power switches are usually implemented using semiconductor devices such as TXS0108EPWR transistors and field effect tubes. When the power switch tube is on, the current in the circuit flows through the switch tube, and the output voltage of the power supply is positive; When the power switch tube is off, the current in the circuit is disconnected, and the output voltage of the power supply is zero. The switching speed and switching efficiency of the power switch are the key factors affecting its performance.

2. Classification

According to the type of power switch tube, the power switch can be divided into diode switch and MOS tube switch. Diode switch uses transistor, its main advantage is simple structure, low cost, but its switching speed is slow, low efficiency; The MOS switch uses the field effect tube, which has the main advantage of fast switching speed and high efficiency, but the cost is higher.

3. Design essentials

The design points of power switch include the selection of switch tube, the design of drive circuit and the design of protection circuit. The selection of switching tube should consider its on-resistance, switching speed and voltage resistance and other factors. The drive circuit should ensure the normal on-off and off of the switching tube, and ensure the switching speed and efficiency. Protection circuit to protect the switch tube from current, overvoltage and other factors of damage.

4. Application field

Power switches are widely used in various electronic devices, such as power adapters, LED lighting, power tools, electric vehicles and so on.

Ⅱ, The driver chip

1. Basic principles

A driver chip is a circuit used to control the rotation of a motor. In electronic devices, driver chips are usually implemented using semiconductor devices such as transistors and field effect tubes. The driver chip can control the speed, direction and stop of the motor.

2. Classification

According to the type of motor, the driver chip can be divided into DC motor driver chip and stepper motor driver chip. The DC motor driver chip usually uses H-bridge circuit, which can control the positive and negative rotation and speed of the motor. Stepper motor driver chip usually uses pulse signal control, which can control the number of steps and speed of the motor and other parameters.

3. Design essentials

The key points of driver chip design include the selection of motor, the design of drive circuit and the design of protection circuit. The selection of motor should consider its speed, torque and power and other factors. The drive circuit should ensure the normal rotation and stop of the motor, and ensure the accuracy and smoothness of the speed and torque. Protection circuit to protect the motor from current, overvoltage and other factors of damage.

4. Application field

Driver chips are widely used in various electronic devices, such as robots, automobiles, home appliances, medical equipment and so on.

Ⅲ, The development trend of power switches and driver chips

With the development of electronic equipment, the performance and reliability of power switches and driver chips are increasingly required. In the future, power switch and driver chips will develop in the direction of low power consumption, high efficiency, small size, multi-function and high reliability. In addition, with the rise of emerging applications such as electric vehicles and smart homes, the demand for power switches and driver chips will also increase.

Conclusion

Power switch and driver chip is an indispensable part of electronic equipment, its performance and reliability directly affect the service life and stability of equipment. Therefore, the development of efficient and reliable power switches and driver chips is an important direction of the development of the electronics industry. In the future, power switch and driver chips will continue to develop in the direction of low power consumption, high efficiency, small size, multi-function and high reliability to adapt to the continuous upgrading of electronic equipment and the continuous emergence of new applications.