LM137K

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Adjustable output voltage - High current capability - Low dropout voltage - Thermal overload protection - Short circuit protection

Package: TO-3 metal can package

Essence: The LM137K is a three-terminal adjustable voltage regulator designed to provide a regulated output voltage up to 1.2V to 37V with a maximum current of 1.5A.

Packaging/Quantity: The LM137K is typically sold in individual packages.

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 (typical)
Load Regulation: 0.3% (typical)
Temperature Range: -55°C to +150°C

Detailed Pin Configuration

The LM137K has three pins:

Input Pin (Vin): This pin is connected to the input voltage source.
Output Pin (Vout): This pin provides the regulated output voltage.
Adjustment Pin (Adj): This pin is used to adjust the output voltage.

Functional Features

Adjustable Output Voltage: The LM137K allows the user to set the desired output voltage within the specified range.
High Current Capability: With a maximum output current of 1.5A, the LM137K can handle a wide range of applications.
Low Dropout Voltage: The dropout voltage of 1.5V ensures efficient regulation even when the input voltage is close to the desired output voltage.
Thermal Overload Protection: The LM137K includes built-in thermal overload protection, preventing damage due to excessive temperature.
Short Circuit Protection: The device is designed to withstand short circuits without causing any harm.

Advantages and Disadvantages

Advantages: - Wide input voltage range - Adjustable output voltage - High current capability - Thermal and short circuit protection

Disadvantages: - TO-3 package may require additional heat sinking for high power applications - Limited maximum output current compared to some other voltage regulators

Working Principles

The LM137K is based on a linear voltage regulator architecture. It uses a reference voltage and feedback mechanism to maintain a stable output voltage regardless of changes in the input voltage or load conditions. By adjusting the resistance connected to the adjustment pin, the output voltage can be set to the desired value within the specified range.

Detailed Application Field Plans

The LM137K is commonly used in various applications where a regulated voltage supply is required. Some typical application fields include:

Power Supply Units (PSUs): The LM137K can be used as a voltage regulator in PSUs to provide a stable output voltage for electronic devices.
Automotive Electronics: It can be employed in automotive electronics to regulate voltages for various components such as sensors, actuators, and control modules.
Industrial Control Systems: The LM137K finds applications in industrial control systems to ensure consistent and reliable power supply to critical components.
Audio Amplifiers: It can be utilized in audio amplifiers to regulate the voltage supplied to the amplifier circuitry, resulting in improved performance and reduced distortion.

Detailed and Complete Alternative Models

Some alternative models to the LM137K that offer similar functionality are:

LM317: This adjustable voltage regulator has a similar pin configuration and characteristics but offers a lower maximum output current of 1.5A.
LM338: With a higher maximum output current of 5A, the LM338 is suitable for applications requiring higher power capabilities.
LT1083: This voltage regulator provides a fixed output voltage and has a maximum output current of 7.5A, making it suitable for high-power applications.

These alternative models can be considered based on specific requirements and desired performance characteristics.

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技術ソリューションにおける LM137K の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of LM137K in technical solutions:

Q: What is LM137K? A: LM137K is a three-terminal adjustable voltage regulator that can provide a regulated output voltage between -1.2V and -37V.
Q: What are the typical applications of LM137K? A: LM137K is commonly used in power supply circuits, battery chargers, audio amplifiers, and other electronic devices where a stable and adjustable voltage is required.
Q: How does LM137K regulate the output voltage? A: LM137K 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 LM137K can handle? A: LM137K can handle a maximum output current of 1.5A, but it is recommended to use a heatsink for higher currents to prevent overheating.
Q: Can LM137K be used in both positive and negative voltage applications? A: Yes, LM137K can be used in both positive and negative voltage applications by simply connecting the appropriate input and output terminals.
Q: How do I adjust the output voltage of LM137K? A: The output voltage of LM137K can be adjusted by connecting a resistor divider network between the adjustment terminal and ground, as per the datasheet guidelines.
Q: Is LM137K protected against overcurrent and thermal overload? A: Yes, LM137K has built-in protection features such as current limiting and thermal shutdown to protect itself from excessive current or temperature.
Q: Can LM137K operate with a wide range of input voltages? A: Yes, LM137K can operate with input voltages ranging from -40V to -2.5V, making it suitable for various power supply applications.
Q: What is the typical dropout voltage of LM137K? A: The typical dropout voltage of LM137K is around 2V, which means the input voltage must be at least 2V higher than the desired output voltage.
Q: Are there any specific precautions to consider when using LM137K? A: It is important to use appropriate decoupling capacitors near the input and output pins of LM137K to minimize noise and ensure stability in the circuit. Additionally, proper heat dissipation should be ensured when operating at higher currents or in high-temperature environments.