LM337K

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Adjustable output voltage - Negative voltage regulator - High current capability - Thermal overload protection

Package: TO-3 metal can package

Essence: The LM337K is a three-terminal adjustable negative voltage regulator IC. It provides a regulated output voltage that can be adjusted by the user.

Packaging/Quantity: The LM337K is typically sold in packs of 1 or more units.

Specifications

Input Voltage Range: -40V to -2.5V
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)
Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM337K has three pins:

Input Pin (Vin): This pin is used to connect the input voltage to the IC.
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 LM337K allows the user to set the desired output voltage within the specified range.
Negative Voltage Regulator: It provides a negative output voltage, which is useful in various applications.
High Current Capability: The IC can handle high currents up to 1.5A, making it suitable for power-hungry devices.
Thermal Overload Protection: The LM337K incorporates thermal overload protection, preventing damage due to excessive heat.

Advantages and Disadvantages

Advantages: - Adjustable output voltage allows flexibility in various applications. - High current capability makes it suitable for power-hungry devices. - Thermal overload protection ensures reliability and safety.

Disadvantages: - Requires external components for proper operation. - Negative voltage output limits its use to specific applications.

Working Principles

The LM337K operates based on the principle of a linear voltage regulator. It uses a reference voltage and an adjustable resistor network to regulate the output voltage. By adjusting the resistance, the user can set the desired output voltage within the specified range. The IC also incorporates thermal overload protection to prevent damage due to excessive heat.

Detailed Application Field Plans

The LM337K finds applications in various fields, including:

Power Supply Design: It is commonly used in power supply circuits to provide regulated negative voltages.
Audio Amplifiers: The IC can be used in audio amplifiers to generate negative bias voltages.
Instrumentation: It is utilized in instrumentation circuits that require precise negative voltage regulation.
Battery Charging Systems: The LM337K can be employed in battery charging systems to provide regulated negative voltages.

Detailed and Complete Alternative Models

Some alternative models to the LM337K include:

LM337T: TO-220 package, similar specifications.
LM337MP: Miniature package, suitable for space-constrained applications.
LM137: Adjustable positive voltage regulator, suitable for positive voltage regulation.

These alternative models offer similar functionality and can be used as substitutes for the LM337K in various applications.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací LM337K v technických řešeních

Sure! Here are 10 common questions and answers related to the application of LM337K in technical solutions:

Q: What is LM337K? A: LM337K is a three-terminal adjustable negative voltage regulator IC that can provide a regulated output voltage ranging from -1.2V to -37V.
Q: How does LM337K work? A: LM337K works by comparing the reference voltage with the feedback voltage to regulate the output voltage. It adjusts the resistance between the output and adjust pins to maintain a constant output voltage.
Q: What is the maximum current LM337K can handle? A: LM337K can handle a maximum current of up to 1.5A, but it is recommended to stay within its safe operating limits for better performance.
Q: Can LM337K be used as a positive voltage regulator? A: No, LM337K is specifically designed as a negative voltage regulator. For positive voltage regulation, you would need to use a different IC like LM317K.
Q: What are the typical applications of LM337K? A: LM337K is commonly used in various applications such as power supplies, battery chargers, audio amplifiers, and voltage regulators in electronic circuits.
Q: How do I calculate the resistor values for LM337K to obtain a specific output voltage? A: The output voltage can be calculated using the formula: Vout = Vref × (1 + R2/R1) - Iadj × R2, where Vref is the reference voltage (usually -1.25V), R1 is the fixed resistor, R2 is the variable resistor, and Iadj is the adjustment pin current.
Q: Is LM337K protected against overcurrent and overheating? A: Yes, LM337K has built-in thermal shutdown and current limiting protection features to prevent damage due to excessive current or temperature.
Q: Can I use LM337K without a heatsink? A: It is recommended to use a heatsink with LM337K, especially when operating at higher currents or in high-temperature environments, to dissipate the heat generated by the IC.
Q: What is the input voltage range for LM337K? A: The input voltage range for LM337K typically varies from -40V to -2.5V, but it is important to check the datasheet for the specific model you are using.
Q: Are there any precautions to consider while using LM337K? A: Yes, some precautions include avoiding reverse polarity connections, ensuring proper grounding, providing adequate cooling, and staying within the specified voltage and current limits of the IC.