LM217MDT

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LM217MDT Application Field and Working Principle

The LM217MDT is a step-down switching regulator, which is a component of the wide range of low voltage regulator semiconductor devices available in the market under the linear category. These devices are used in personal computers, automotive and industrial electronics, as well as in many other applications. The device includes an adjustable output voltage and current limit that can be set to various levels depending on the required application. The device also features an internal oscillator with a wide range of frequency selectable modes. It also features soft start capability and over-current protection, making it a very useful component in many applications.

Overview:

The LM217MDT is a member of the family of Linear Voltage Regulators, which are integrated circuits designed for the regulation and stabilization of voltage in electronic circuits, particularly in LCD and LED Displays. It is a 3 terminal adjustable regulator with an output voltage of up to 40 Volts, and a wide output current range of up to 3A. The device is constituted of an internal oscillator and a switching chopper circuit.

Applications:

There are numerous applications for the LM217MDT, including: motor controllers, battery chargers, computers and other peripheral devices, security applications, variable speed drives, and other applications requiring a precise control of voltage and current. The device is widely used in notebooks, household/industrial electronics, web servers/router, switch mode power supplies, communication equipment and other equipment requiring a precise voltage control.

Functional Description:

The LM217MDT is a monolithic integrated voltage regulator circuit consisting of a switching chopper and an adjustable reference voltage and a pair of output transistors. The device has the ability to regulate and stabilize the output voltage to a required level. It uses a feedback loop from the output to sense voltage and adjust the output voltage according to the internal reference voltage. The internal oscillator provides an adjustable frequency, while the current limit is adjustable through an external resistor.

Design:

The LM217MDT consists of an adjustable reference voltage (VREF) input and a pair of output transistors connected in series to the power supply. The VREF input is compared to the output voltage through a feedback path. When the sum of the voltage at the Vref terminals is greater than the output voltage, the output voltage increases until the reference voltage and the output voltage are equal. If the reference voltage is decreased, then the output voltage will decrease accordingly.

Continuous Current Limit:

The LM217MDT has an adjustable continuous current limit which can be set using an external resistor. When the output current reaches the limit, the device will shut down its output until the current is reduced below the limit. This feature helps to protect the device against overloads and short circuits.

Protection Features:

The LM217MDT also features several protection features, such as Response Time limit, Over-current limit and Soft Start capability, which helps to protect the device against any faults or overloads. The Response Time limit helps to protect the output voltage against sudden changes, while the Over-current limit protects the device against too much current. The Soft Start option is a feature which aids in the proper start up of the device under normal operating conditions.

Conclusion:

The LM217MDT is an ideal choice for applications requiring precise regulation and excellent load regulation. It offers an adjustable output voltage range of up to 40V, and a wide range of current limitation, making it an ideal choice for use in a wide variety of applications. It also offers several protection features, such as Response Time limit, Over-current limit and Soft Start, which helps to protect the device against faults or overloads. Finally, the device has a wide range of frequency selectable modes, making it an excellent choice for use in various applications.

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