仕様
| 属性 | 値 |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Part Status | Active |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 1.25V |
| Voltage - Output (Max) | 37V |
| Current - Output | 1.5A |
| Current - Quiescent (Iq) | 10 mA |
| PSRR | 80dB ~ 65dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Surface Mount |
概要
Description
The LM317AEMP/NOPB is a voltage regulator from Texas Instruments, designed to provide a stable output voltage that is adjustable over a range of 1.25V to 37V. It is part of the LM317 series, known for their versatility and reliability in various electronic applications. The "A" version typically indicates improved specifications or performance over the standard LM317.
This device can deliver an output current up to 1.5A, making it suitable for a wide range of applications, including power supplies, battery chargers, and other circuits requiring a stable voltage. It features a built-in current limiting, thermal overload protection, and safe area protection, which enhance its durability and reliability.
The "NOPB" suffix indicates the part is lead-free and RoHS compliant, aligning with modern environmental standards. The compact package and adaptability make the LM317AEMP/NOPB an ideal choice for both hobbyist projects and professional applications where precise voltage regulation is necessary.
This device can deliver an output current up to 1.5A, making it suitable for a wide range of applications, including power supplies, battery chargers, and other circuits requiring a stable voltage. It features a built-in current limiting, thermal overload protection, and safe area protection, which enhance its durability and reliability.
The "NOPB" suffix indicates the part is lead-free and RoHS compliant, aligning with modern environmental standards. The compact package and adaptability make the LM317AEMP/NOPB an ideal choice for both hobbyist projects and professional applications where precise voltage regulation is necessary.
Equivalent
The LM317AEMP/NOPB is a voltage regulator. Equivalent products include:
1. LM317 (from various manufacturers like ON Semiconductor, STMicroelectronics, etc.)
2. L78 series (like L7805, L7812, etc., depending on required output voltage)
3. LD1117 (from STMicroelectronics)
4. LT1086 (from Analog Devices)
5. UA78 series (from Texas Instruments and other brands)
When selecting an equivalent, ensure the replacement meets the same voltage, current, and thermal specifications.
1. LM317 (from various manufacturers like ON Semiconductor, STMicroelectronics, etc.)
2. L78 series (like L7805, L7812, etc., depending on required output voltage)
3. LD1117 (from STMicroelectronics)
4. LT1086 (from Analog Devices)
5. UA78 series (from Texas Instruments and other brands)
When selecting an equivalent, ensure the replacement meets the same voltage, current, and thermal specifications.
Features
The LM317AEMP/NOPB is a versatile, adjustable positive voltage regulator. Key features include:
1. Output Voltage Range: Adjustable from 1.25V to 37V, allowing for a wide variety of applications.
2. Load Regulation: Offers excellent load regulation of 0.1%, ensuring stable voltage output despite changes in load current.
3. Line Regulation: Provides line regulation of 0.01%/V, maintaining output stability with varying input voltage.
4. Output Current: Capable of supplying up to 1.5A of load current.
5. Thermal Overload Protection: Protects the device from overheating, enhancing reliability.
6. Short-Circuit Protection: Guards against damage from short circuits by limiting current output.
7. Safe Operating Area Protection: Ensures device operates within safe limits, preventing damage from excessive voltage or current.
8. Package: Available in a small-outline SOT-223 package, suitable for compact designs.
9. Temperature Range: Operates over a wide temperature range, typically from -40°C to 125°C.
These features make the LM317AEMP/NOPB suitable for a range of applications requiring reliable, adjustable voltage regulation.
1. Output Voltage Range: Adjustable from 1.25V to 37V, allowing for a wide variety of applications.
2. Load Regulation: Offers excellent load regulation of 0.1%, ensuring stable voltage output despite changes in load current.
3. Line Regulation: Provides line regulation of 0.01%/V, maintaining output stability with varying input voltage.
4. Output Current: Capable of supplying up to 1.5A of load current.
5. Thermal Overload Protection: Protects the device from overheating, enhancing reliability.
6. Short-Circuit Protection: Guards against damage from short circuits by limiting current output.
7. Safe Operating Area Protection: Ensures device operates within safe limits, preventing damage from excessive voltage or current.
8. Package: Available in a small-outline SOT-223 package, suitable for compact designs.
9. Temperature Range: Operates over a wide temperature range, typically from -40°C to 125°C.
These features make the LM317AEMP/NOPB suitable for a range of applications requiring reliable, adjustable voltage regulation.
Pinout
The LM317AEMP/NOPB is a three-terminal adjustable voltage regulator. It typically comes in a SOT-223 package with three pins. The pin functions are as follows:
1. Input (IN): This pin is where the input voltage is supplied. It should be a voltage higher than the desired output voltage plus a dropout voltage specific to the device.
2. Output (OUT): This pin provides the regulated output voltage. The output voltage can be adjusted using external resistors connected between the output and the adjust pin.
3. Adjust (ADJ): This pin is used to set the output voltage. By connecting a resistor between the adjust pin and the output, and another resistor between the adjust pin and ground, the output voltage can be set according to the formula:
\[
V_{\text{OUT}} = V_{\text{REF}} \left(1 + \frac{R_2}{R_1}\right) + I_{\text{ADJ}} \times R_2
\]
Where \( V_{\text{REF}} \) is typically 1.25V, \( R_1 \) and \( R_2 \) are external resistors, and \( I_{\text{ADJ}} \) is a small adjustment current.
The LM317AEMP/NOPB is widely used for its simplicity and versatility in adjusting voltage levels for various applications.
1. Input (IN): This pin is where the input voltage is supplied. It should be a voltage higher than the desired output voltage plus a dropout voltage specific to the device.
2. Output (OUT): This pin provides the regulated output voltage. The output voltage can be adjusted using external resistors connected between the output and the adjust pin.
3. Adjust (ADJ): This pin is used to set the output voltage. By connecting a resistor between the adjust pin and the output, and another resistor between the adjust pin and ground, the output voltage can be set according to the formula:
\[
V_{\text{OUT}} = V_{\text{REF}} \left(1 + \frac{R_2}{R_1}\right) + I_{\text{ADJ}} \times R_2
\]
Where \( V_{\text{REF}} \) is typically 1.25V, \( R_1 \) and \( R_2 \) are external resistors, and \( I_{\text{ADJ}} \) is a small adjustment current.
The LM317AEMP/NOPB is widely used for its simplicity and versatility in adjusting voltage levels for various applications.
Manufacturer
The LM317AEMP/NOPB is manufactured by Texas Instruments. Texas Instruments (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which are used in electronics worldwide. TI is one of the top semiconductor companies globally, known for its analog chips, embedded processors, and digital light processing technology. It serves a broad range of markets, including industrial, automotive, personal electronics, communications equipment, and enterprise systems.
Application
The LM317AEMP/NOPB is a versatile voltage regulator used in various applications requiring adjustable output voltages. Common application areas include:
1. Power Supply Design: Used to create stable and adjustable power supply outputs.
2. Battery Chargers: Provides precise control over charging voltage levels.
3. LED Drivers: Regulates current for consistent LED brightness.
4. Embedded Systems: Supplies adjustable power to microcontrollers and other components.
5. Test and Measurement Equipment: Offers precise voltage control for testing circuits.
6. DIY Electronics Projects: Popular in hobbyist projects requiring custom voltage levels.
Its adjustable nature makes it suitable for projects where precise voltage regulation is crucial.
1. Power Supply Design: Used to create stable and adjustable power supply outputs.
2. Battery Chargers: Provides precise control over charging voltage levels.
3. LED Drivers: Regulates current for consistent LED brightness.
4. Embedded Systems: Supplies adjustable power to microcontrollers and other components.
5. Test and Measurement Equipment: Offers precise voltage control for testing circuits.
6. DIY Electronics Projects: Popular in hobbyist projects requiring custom voltage levels.
Its adjustable nature makes it suitable for projects where precise voltage regulation is crucial.
Package
The LM317AEMP/NOPB is a linear voltage regulator available in a SOT-223 package. This package is designed for surface-mount technology (SMT), providing a compact and efficient solution for regulating voltage in various electronic applications.
