LM723H

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Integrated circuits (ICs) are interconnected electrical components that form the basic building blocks of electronic equipment. They are used to reduce the complexity and size of electronic systems. An important type of integrated circuit is the voltage regulator, which is used to ensure a steady and reliable output voltage is delivered to other components. The LM723H is an example of a linear voltage regulator, used in a wide range of applications. This article will discuss the working principle of the LM723H, as well as its application field.

The LM723H is a linear voltage regulator that outputs a fixed 5V or 3V and has an input voltage range of 1.5V to 20V. This regulator is designed with low-cost, linear and better transient response applications in mind. It features a voltage reference stability of 0.07%, high-ripple rejection of 82dB, current limiting, and thermal protection. The LM723H can operate with a wide thermal range, from -40°C to 85°C. It has an operating time of less than 20 nanoseconds, making it suitable for applications that need quick response.

Working Principle

The LM723H is a three-terminal,monolithic voltage regulator. It contains on-chip components like a PNP transistor and a Zener diode. When a voltage is applied to the input terminal, the PNP transistor will draw current through the connected load and the Zener diode. The amount of current drawn will determine the voltage output, up to a maximum of 5V for the LM723H. If the load current decreases, the output voltage will decrease accordingly.

The integrated PNP transistor and Zener diode also provide other features of the LM723H. The transistor will act as a current limiter and protect the circuit from damage due to excessive current. The Zener diode can provide high-ripple rejection of over 82dB, which will reduce the amount of spurious signals produced. This makes it suitable for applications that need clean power supply without electrical noise.

Application Field

The LM723H is a versatile regulator that can be used in a wide range of applications. It is widely used in motor control circuits, consumer appliances, automotive electronics, and communication. Its low-power consumption and high ripple rejection make it suitable for medical equipment and instrumentation. Due to its thermal protection feature, it can be used in high power applications, such as in power supplies, to protect the circuit from overheating.

The LM723H is also used in portable equipment, such as laptops and cell phones where a steady and reliable source of power is needed. Its small form factor makes it ideal for such applications, as it can easily fit into tight spaces. It is also used in digital circuits where both a fixed voltage and current are required for proper functioning.

In summary, the LM723H is a versatile and reliable linear voltage regulator, which can be used in a wide range of applications. Its integrated PNP transistor and Zener diode provides protection and high-ripple rejection, making it suitable for medical and instrumentation applications. Its small form factor and low-power consumption makes it a great choice for portable equipment. The LM723H is an excellent choice for any application requiring a reliable and efficient voltage regulator.

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