LM237K

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Adjustable output voltage - High precision - Low dropout voltage - Current limiting and thermal shutdown protection

Package: TO-220

Essence: The LM237K is a three-terminal adjustable negative voltage regulator. It provides a regulated output voltage that can be adjusted using external resistors.

Packaging/Quantity: The LM237K is typically sold in packs of 10 units.

Specifications

Input Voltage Range: -4V to -40V
Output Voltage Range: -1.2V to -37V
Output Current: Up to 1.5A
Dropout Voltage: 1.5V (typical)
Line Regulation: 0.01%/V
Load Regulation: 0.3%/A
Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM237K has three pins:

Input Pin (IN): This pin is connected to the input voltage source.
Output Pin (OUT): This pin provides the regulated output voltage.
Adjustment Pin (ADJ): This pin is used to adjust the output voltage by connecting external resistors.

Functional Features

Adjustable Output Voltage: The LM237K allows for precise adjustment of the output voltage according to the application requirements.
High Precision: It provides a highly accurate and stable output voltage, ensuring reliable performance.
Low Dropout Voltage: The low dropout voltage minimizes power dissipation and improves efficiency.
Current Limiting and Thermal Shutdown Protection: The LM237K incorporates current limiting and thermal shutdown features to protect the device from excessive current and temperature.

Advantages and Disadvantages

Advantages: - Wide input voltage range - Adjustable output voltage - High precision and stability - Current limiting and thermal shutdown protection

Disadvantages: - Negative voltage regulator (may not be suitable for all applications) - Requires external resistors for voltage adjustment

Working Principles

The LM237K operates as a negative voltage regulator using an internal reference voltage. It compares the output voltage with the reference voltage and adjusts the pass transistor to maintain a stable output voltage. The adjustable feature allows the user to set the desired output voltage by connecting appropriate resistors to the adjustment pin.

Detailed Application Field Plans

The LM237K is commonly used in various applications, including:

Power Supply Systems: It can be used to regulate negative voltages in power supply circuits.
Audio Amplifiers: The LM237K can provide a stable negative voltage supply for audio amplifier circuits.
Industrial Control Systems: It finds application in industrial control systems that require precise negative voltage regulation.
Instrumentation: The LM237K is suitable for providing regulated negative voltages in instrumentation circuits.

Detailed and Complete Alternative Models

Some alternative models to the LM237K include:

LM337K: Similar to LM237K but provides adjustable positive voltage regulation.
LM7905: Fixed -5V voltage regulator.
LT1963A: Adjustable negative voltage regulator with low dropout voltage.

These alternative models offer similar functionality and can be considered based on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací LM237K v technických řešeních

Sure! Here are 10 common questions and answers related to the application of LM237K in technical solutions:

Q: What is LM237K? A: LM237K is a three-terminal adjustable negative voltage regulator IC that can provide a regulated output voltage ranging from -1.2V to -37V.
Q: What are the typical applications of LM237K? A: LM237K is commonly used in various technical solutions such as power supplies, battery chargers, audio amplifiers, and voltage references.
Q: How does LM237K regulate the output voltage? A: LM237K uses an internal reference voltage and feedback mechanism to maintain a constant output voltage regardless of changes in input voltage or load conditions.
Q: What is the maximum current LM237K can handle? A: LM237K can handle a maximum output current of up to 1.5A, but it is recommended to stay within its specified limits for optimal performance.
Q: Can LM237K be used to generate positive voltages? A: No, LM237K is specifically designed for generating negative voltages. For positive voltage regulation, you would need to use a different IC like LM317K.
Q: How do I set the desired output voltage using LM237K? A: The output voltage of LM237K can be adjusted by connecting external resistors to its adjustment pin (ADJ) and output pin (OUT), following the provided formula in the datasheet.
Q: Is LM237K protected against overcurrent and overheating? A: Yes, LM237K has built-in thermal shutdown and current limiting protection features to prevent damage due to excessive temperature or current.
Q: Can LM237K operate with a wide range of input voltages? A: Yes, LM237K can operate with input voltages ranging from -40V to -3V, making it suitable for various applications.
Q: What is the typical dropout voltage of LM237K? A: The typical dropout voltage of LM237K is around 2V, which means the input voltage must be at least 2V higher than the desired output voltage for proper regulation.
Q: Are there any specific precautions to consider when using LM237K? A: It is important to use appropriate heat sinking and follow the recommended operating conditions mentioned in the datasheet to ensure reliable and safe operation of LM237K.