LM138K
Product Overview
Category: Integrated Circuit (IC)
Use: Voltage Regulator
Characteristics: - High current capability - Adjustable output voltage - Low dropout voltage - Thermal overload protection - Short circuit protection
Package: TO-3 metal can package
Essence: The LM138K is a three-terminal adjustable positive voltage regulator capable of supplying high currents with low dropout voltage. It is designed to provide a regulated output voltage even when the input voltage is significantly higher than the desired output voltage.
Packaging/Quantity: The LM138K is typically sold in individual packages.
Specifications
- Input Voltage Range: 2.5V to 40V
- Output Voltage Range: 1.2V to 37V
- Output Current: Up to 5A
- Dropout Voltage: 1.5V typical at 5A
- Line Regulation: 0.01%/V
- Load Regulation: 0.3%/A
- Ripple Rejection Ratio: 80dB
- Operating Temperature Range: -40°C to +125°C
Pin Configuration
The LM138K has three pins:
- Input (IN): This pin is connected to the input voltage source.
- Output (OUT): This pin provides the regulated output voltage.
- Adjust (ADJ): This pin is used to adjust the output voltage.
Functional Features
- Adjustable Output Voltage: The LM138K allows the user to adjust the output voltage within a specified range.
- High Current Capability: It can supply up to 5A of output current, making it suitable for applications requiring high power.
- Low Dropout Voltage: The regulator maintains a low voltage drop between the input and output, ensuring efficient power conversion.
- Thermal Overload Protection: The LM138K includes built-in protection against excessive heat, preventing damage to the device.
- Short Circuit Protection: It features short circuit protection, safeguarding the regulator and the connected circuitry.
Advantages and Disadvantages
Advantages: - High current capability - Adjustable output voltage - Low dropout voltage - Thermal and short circuit protection - Wide operating temperature range
Disadvantages: - TO-3 package may require additional heatsinking for high power applications - Limited output voltage range compared to some other voltage regulators
Working Principles
The LM138K is based on a linear voltage regulation principle. It uses a pass transistor in conjunction with feedback circuitry to maintain a stable output voltage. The adjustable output voltage is achieved by varying the resistance connected to the ADJ pin.
Detailed Application Field Plans
The LM138K can be used in various applications that require a regulated power supply. Some common application fields include:
- Power Supply Units (PSUs) for electronic devices
- Battery charging circuits
- Automotive electronics
- Industrial control systems
- Audio amplifiers
Detailed and Complete Alternative Models
Some alternative models that offer similar functionality to the LM138K are:
- LM317: Adjustable positive voltage regulator with lower current capability.
- LM350: Adjustable positive voltage regulator with higher current capability.
- LM7805: Fixed 5V voltage regulator.
These alternative models provide options for different current requirements and fixed output voltages.
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기술 솔루션에 LM138K 적용과 관련된 10가지 일반적인 질문과 답변을 나열하세요.
Sure! Here are 10 common questions and answers related to the application of LM138K in technical solutions:
Q: What is LM138K? A: LM138K is a voltage regulator integrated circuit (IC) that provides a fixed output voltage.
Q: What is the input voltage range for LM138K? A: The input voltage range for LM138K is typically between 4.5V and 40V.
Q: What is the output voltage range of LM138K? A: LM138K can provide a fixed output voltage of 5V, 12V, or 15V, depending on the specific variant.
Q: Can LM138K handle high currents? A: Yes, LM138K is designed to handle high currents up to 5A.
Q: Is LM138K suitable for automotive applications? A: Yes, LM138K is often used in automotive applications due to its wide input voltage range and high current capability.
Q: Does LM138K require external components for operation? A: Yes, LM138K requires a few external components such as capacitors and resistors for proper operation.
Q: Can LM138K handle both step-up and step-down voltage regulation? A: No, LM138K is primarily designed for step-down voltage regulation (buck converter).
Q: What is the thermal protection feature of LM138K? A: LM138K has built-in thermal shutdown protection that prevents the IC from overheating.
Q: Can LM138K operate in harsh environments? A: Yes, LM138K is designed to operate in a wide temperature range and can withstand harsh environmental conditions.
Q: Are there any recommended applications for LM138K? A: LM138K is commonly used in power supply circuits, battery chargers, motor control systems, and other applications that require stable voltage regulation.
Please note that these answers are general and may vary depending on the specific datasheet and application requirements.