LM338K
Product Overview
Category: Integrated Circuit (IC)
Use: Voltage Regulator
Characteristics: - Adjustable output voltage - High current capability - Thermal overload protection - Short circuit protection
Package: TO-3 metal can package
Essence: The LM338K is a versatile voltage regulator IC that provides adjustable output voltage with high current capability. It is commonly used in various electronic circuits to regulate and stabilize the voltage.
Packaging/Quantity: The LM338K is typically sold individually in a TO-3 metal can package.
Specifications
- Input Voltage Range: 4V to 40V
- Output Voltage Range: 1.2V to 37V
- Output Current: Up to 5A
- Dropout Voltage: 1.5V (typical)
- Line Regulation: 0.01%/V (typical)
- Load Regulation: 0.1% (typical)
- Temperature Range: -40°C to +125°C
Detailed Pin Configuration
The LM338K 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.
- Adjust Pin (ADJ): This pin is used to adjust the output voltage using an external resistor.
Functional Features
- Adjustable Output Voltage: The LM338K allows the user to set the desired output voltage within the specified range.
- High Current Capability: With a maximum output current of 5A, it can handle a wide range of applications.
- Thermal Overload Protection: The IC incorporates thermal shutdown circuitry to protect itself from overheating.
- Short Circuit Protection: In case of a short circuit, the LM338K limits the output current to prevent damage.
Advantages and Disadvantages
Advantages: - Wide input voltage range - Adjustable output voltage - High current capability - Thermal and short circuit protection
Disadvantages: - Requires an external resistor for voltage adjustment - TO-3 package may require additional heat sinking
Working Principles
The LM338K is a three-terminal voltage regulator based on the adjustable positive voltage regulator architecture. It uses a reference voltage, feedback mechanism, and pass transistor to regulate the output voltage. By adjusting the resistance connected to the ADJ pin, the output voltage can be set to the desired level.
Detailed Application Field Plans
The LM338K finds applications in various fields, including: 1. Power supply circuits 2. Battery charging systems 3. Audio amplifiers 4. LED drivers 5. Industrial control systems
Detailed and Complete Alternative Models
Some alternative models to the LM338K are: 1. LM317T 2. LM350T 3. LT1083CP 4. LT3080
These alternatives offer similar functionality and can be used as substitutes depending on specific requirements.
In conclusion, the LM338K is a versatile voltage regulator IC that provides adjustable output voltage with high current capability. Its thermal and short circuit protection features make it suitable for a wide range of applications. With its robust specifications and functional features, it is widely used in power supply circuits, battery charging systems, audio amplifiers, LED drivers, and industrial control systems.
技術ソリューションにおける LM338K 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 LM338K in technical solutions:
Q: What is LM338K? A: LM338K is a voltage regulator integrated circuit (IC) that can provide adjustable output voltages up to 32V and currents up to 5A.
Q: What are the typical applications of LM338K? A: LM338K is commonly used in power supply circuits, battery chargers, and other applications where precise voltage regulation is required.
Q: How does LM338K regulate voltage? A: LM338K uses a feedback mechanism to adjust its output voltage based on a reference voltage and an external resistor network.
Q: What is the maximum input voltage for LM338K? A: The maximum input voltage for LM338K is typically around 40V, but it can vary depending on the specific manufacturer's datasheet.
Q: Can LM338K handle high currents? A: Yes, LM338K can handle currents up to 5A, but it requires proper heat sinking to dissipate the excess heat generated.
Q: How do I calculate the value of the external resistors for voltage regulation? A: The output voltage can be calculated using the formula Vout = 1.25V * (1 + R2/R1), where R1 and R2 are the values of the external resistors.
Q: Can LM338K be used as a constant current source? A: Yes, LM338K can be configured as a constant current source by using a sense resistor in series with the load.
Q: Is LM338K suitable for automotive applications? A: Yes, LM338K can be used in automotive applications, but it may require additional protection circuitry to handle voltage transients and other automotive-specific requirements.
Q: Can LM338K operate in parallel for higher current output? A: Yes, multiple LM338K ICs can be connected in parallel to increase the overall current output capability.
Q: What are the important considerations for heat dissipation with LM338K? A: Proper heat sinking is crucial when using LM338K at high currents. The IC should be mounted on a heat sink with sufficient thermal conductivity and surface area to dissipate the heat effectively.
Please note that these answers are general guidelines, and it's always recommended to refer to the specific manufacturer's datasheet for detailed information and application notes.