LM237K

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LM237K Application Field and Working Principle

The LM237K is a three-terminal adjustable regulators designed for use in applications that require a relatively good regulation of the output voltage. It can handle large overloads and is capable of providing up to 3A peak output current. This makes it suitable for a variety of applications including computers, telecommunications and medical electronics. The LM237K is offered in a TO-220 package and is designed to allow the user to adjust the output voltage by changing the value of an external resistive network. The LM237K is a monolithic integrated circuit, meaning that it is composed of multiple components that are manufactured on one single die or substrate.

Applications

The LM237K is a useful device for applications that need to regulate and control a relatively narrow output voltage range. These applications may include computers, telecommunications, and medical electronics. It is also used in battery charging systems and other heavy load circuits where a relatively good regulation of the output voltage is required. The LM237K is typically used to regulate the output voltage of power supplies up to 28V.

Features

• Low cost
• On-chip thermal protection
• Requires only two external resistors for adjustment
• Wide output voltage range
• High overload capability
• High peak output current
• Very low output noise level
• High PSRR @ 1 kHz
• Stable with high capacitive loads

Principle of Operation

The LM237K consists of a series pass transistor and two voltage dividers, an adjustable reference voltage divider and an external potentiometer connected to the output load. The pass transistor is connected between the input and output terminals, and is used to regulate the output voltage. The voltage dividers are used to set the reference voltage and control the output voltage. The reference voltage divider sets the output voltage by providing a reference voltage that is proportional to the input. The external potentiometer is used to adjust the output voltage. When the reference voltage reaches the set value, the pass transistor switches off and regulates the output voltage. The load current is limited by the base current of the pass transistor, which determines the output current. The peak output current is limited by the maximum voltage drop across the pass transistor.

Conclusion

The LM237K is a three-terminal adjustable regulator designed for use in applications that require a relatively good regulation of the output voltage. It is suitable for a variety of applications, including computers, telecommunications and medical electronics. The LM237K features a low cost, wide output voltage range, high overload capability, high peak output current, and very low output noise level. It is also capable of providing up to 3A peak output current. The LM237K is easy to use, as it only requires two external resistors for adjustment. Its principle of operation is based on a series pass transistor and two voltage dividers, and when the reference voltage reaches the set value, the pass transistor switches off and regulates the output voltage.

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