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LM317
IC REG LINEAR POS ADJ 1.5A TO220
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規格
| Series | LM |
| Part Status | Active |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 1.3V |
| Voltage - Output (Max) | 37V |
| Current - Output | 1.5A |
| PSRR | 60dB (120kHz) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -25°C ~ 125°C (TJ) |
| Mounting Type | Through Hole |
| Package / Case | TO-220-3 |
| Supplier Device Package | TO-220 |
| Current - Supply (Max) | 2.2 A |
概述
Description
The LM317 is a popular adjustable linear voltage regulator used in various electronic circuits. It can output a voltage between 1.25V and 37V, with a maximum output current of 1.5A. Its adjustable nature allows it to be configured to provide different output voltages by using two external resistors.
Key features of the LM317 include:
1. Adjustable Output: The output voltage can be set by selecting appropriate resistor values, enabling flexibility for different applications.
2. Current Regulation: It can act as a current regulator by configuring it with a resistor in series.
3. Thermal Overload Protection: The LM317 has built-in thermal protection to prevent damage from overheating.
4. Short-Circuit Protection: It includes a short-circuit protection feature, making it robust for various applications.
Common applications include power supplies, battery chargers, and voltage regulation in both consumer and industrial electronics. The LM317 is widely used due to its reliability, ease of use, and cost-effectiveness.
Key features of the LM317 include:
1. Adjustable Output: The output voltage can be set by selecting appropriate resistor values, enabling flexibility for different applications.
2. Current Regulation: It can act as a current regulator by configuring it with a resistor in series.
3. Thermal Overload Protection: The LM317 has built-in thermal protection to prevent damage from overheating.
4. Short-Circuit Protection: It includes a short-circuit protection feature, making it robust for various applications.
Common applications include power supplies, battery chargers, and voltage regulation in both consumer and industrial electronics. The LM317 is widely used due to its reliability, ease of use, and cost-effectiveness.
Features
The LM317 is a versatile adjustable voltage regulator with several key features:
1. Adjustable Output Voltage: It can provide output voltages from 1.25V to 37V, adjustable via two external resistors.
2. Load Current: Capable of supplying up to 1.5A of output current, making it suitable for a variety of applications.
3. Thermal Protection: Built-in thermal overload protection prevents damage due to overheating.
4. Short Circuit Protection: It includes current limiting to protect the device and load in case of a short circuit.
5. Wide Input Voltage Range: Accepts input voltages from 3V to 40V, allowing flexibility in design.
6. Low Dropout Voltage: Typically has a dropout voltage of around 3V at full load, suitable for battery-powered applications.
7. Stability: Offers good line and load regulation, maintaining output voltage under varying conditions.
8. Easy to Use: Requires minimal external components for operation, simplifying circuit design.
Overall, the LM317 is widely used in power supply circuits due to its reliability and flexibility.
1. Adjustable Output Voltage: It can provide output voltages from 1.25V to 37V, adjustable via two external resistors.
2. Load Current: Capable of supplying up to 1.5A of output current, making it suitable for a variety of applications.
3. Thermal Protection: Built-in thermal overload protection prevents damage due to overheating.
4. Short Circuit Protection: It includes current limiting to protect the device and load in case of a short circuit.
5. Wide Input Voltage Range: Accepts input voltages from 3V to 40V, allowing flexibility in design.
6. Low Dropout Voltage: Typically has a dropout voltage of around 3V at full load, suitable for battery-powered applications.
7. Stability: Offers good line and load regulation, maintaining output voltage under varying conditions.
8. Easy to Use: Requires minimal external components for operation, simplifying circuit design.
Overall, the LM317 is widely used in power supply circuits due to its reliability and flexibility.
Package
The LM317 is commonly available in several package types, including TO-220, TO-263, and TO-92. The TO-220 is often used for higher power applications due to its larger heat dissipation capability, while TO-92 is suitable for lower power applications. The choice of package affects thermal performance and form factor in circuit designs.
Pinout
The LM317 is a popular adjustable voltage regulator with a total of three pins.
1. Input (Vin) - This pin (Pin 1) is where the input voltage is applied. The input voltage should be higher than the desired output voltage by at least 3V for proper regulation.
2. Output (Vout) - This pin (Pin 2) provides the regulated output voltage. The output can be adjusted between 1.25V and 37V using external resistors.
3. Adjust (Adj) - This pin (Pin 3) is used to set the output voltage. By connecting a resistor network between the output and this pin, the output voltage can be adjusted according to the desired value.
The LM317 is widely used in power supply applications due to its versatility and ability to provide stable output voltage.
1. Input (Vin) - This pin (Pin 1) is where the input voltage is applied. The input voltage should be higher than the desired output voltage by at least 3V for proper regulation.
2. Output (Vout) - This pin (Pin 2) provides the regulated output voltage. The output can be adjusted between 1.25V and 37V using external resistors.
3. Adjust (Adj) - This pin (Pin 3) is used to set the output voltage. By connecting a resistor network between the output and this pin, the output voltage can be adjusted according to the desired value.
The LM317 is widely used in power supply applications due to its versatility and ability to provide stable output voltage.
Manufacturer
The LM317 is a voltage regulator originally developed by Semiconductor Components Industries, LLC, a subsidiary of ON Semiconductor. ON Semiconductor is a global semiconductor manufacturer that specializes in designing and producing a wide range of electronic components and solutions, including power management, analog, logic, and discrete devices. Founded in 1999, ON Semiconductor serves various markets such as automotive, industrial, and consumer electronics, focusing on energy-efficient technologies and sustainable solutions. The LM317, known for its adjustable output voltage regulation, is widely used in power supply applications across different industries.
Application
The LM317 is a versatile adjustable voltage regulator used in various applications, including power supplies, battery chargers, and voltage regulation in embedded systems. It is utilized to provide a stable output voltage for audio equipment, LED drivers, and instrumentation. Additionally, the LM317 is employed in DIY electronics projects for custom voltage needs and can be found in automotive applications for powering auxiliary devices. Its ability to deliver variable voltage makes it suitable for a wide range of electronic circuits.
Equivalent
Equivalent products to the LM317 voltage regulator include the LM1117, LT1084, LM338, and MCP1825. These alternatives provide adjustable output voltages and similar functionality, but may vary in current ratings and dropout voltages. Always check the specific datasheets for compatibility with your application requirements.
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