規格
| 屬性 | 價值 |
| Package / Case | Bulk |
| 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 |
| PSRR | 64dB ~ 57dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C |
| Mounting Type | Surface Mount |
概述
Description
The LM317DCY is a popular adjustable voltage regulator that can output a stable voltage ranging from 1.25V to 37V, with an output current of up to 1.5A. It is commonly used in electronic circuits to provide a regulated power supply. The LM317DCY is part of the TO-252 package family, making it suitable for applications where space is a constraint.
Key features include thermal overload protection, short-circuit protection, and safe operating area protection, ensuring durability and reliability in various conditions. The device requires only two external resistors to set the output voltage, which provides flexibility and ease of use in different applications.
The LM317DCY is widely used in DIY projects, power supplies, and as a component in more complex designs requiring a stable voltage output. Its versatility and ease of integration make it a go-to component for engineers and hobbyists alike.
Key features include thermal overload protection, short-circuit protection, and safe operating area protection, ensuring durability and reliability in various conditions. The device requires only two external resistors to set the output voltage, which provides flexibility and ease of use in different applications.
The LM317DCY is widely used in DIY projects, power supplies, and as a component in more complex designs requiring a stable voltage output. Its versatility and ease of integration make it a go-to component for engineers and hobbyists alike.
Equivalent
The LM317DCY is a voltage regulator, and equivalent products with similar functionality and specifications include the LM317T, LM317LZ, and LM317K. These are all adjustable three-terminal voltage regulators. Other equivalents might be the LT1086 or the L78xx series, though specifics such as current output and package type should be verified to ensure compatibility for your application. Always check the datasheets for precise electrical and mechanical compatibility.
Features
The LM317DCY is a versatile adjustable voltage regulator designed to provide a stable output voltage over a wide range of input voltages. Key features include:
1. Adjustable Output Voltage: Can be set to any level between 1.25V and 37V using two external resistors.
2. Output Current: Capable of supplying up to 1.5A of load current.
3. Line Regulation: Offers excellent line regulation, typically 0.01%/V.
4. Load Regulation: Provides good load regulation, typically 0.1%.
5. Thermal Overload Protection: Includes built-in thermal overload protection to prevent damage due to overheating.
6. Short-Circuit Protection: Features current limiting to protect against short circuits.
7. Safe Operating Area Protection: Ensures the device operates within safe limits under all conditions.
8. Package Type: Available in a TO-252 package, ideal for surface-mount applications.
Overall, the LM317DCY is suitable for a variety of applications requiring a reliable and adjustable power supply.
1. Adjustable Output Voltage: Can be set to any level between 1.25V and 37V using two external resistors.
2. Output Current: Capable of supplying up to 1.5A of load current.
3. Line Regulation: Offers excellent line regulation, typically 0.01%/V.
4. Load Regulation: Provides good load regulation, typically 0.1%.
5. Thermal Overload Protection: Includes built-in thermal overload protection to prevent damage due to overheating.
6. Short-Circuit Protection: Features current limiting to protect against short circuits.
7. Safe Operating Area Protection: Ensures the device operates within safe limits under all conditions.
8. Package Type: Available in a TO-252 package, ideal for surface-mount applications.
Overall, the LM317DCY is suitable for a variety of applications requiring a reliable and adjustable power supply.
Pinout
The LM317DCY is a voltage regulator in a SOT-223 package, commonly used for adjustable voltage regulation. It typically has three pins:
1. Input (IN): This pin is where the unregulated input voltage is applied. The voltage applied here should be higher than the desired output voltage to ensure proper regulation.
2. Output (OUT): This pin provides the regulated output voltage. The output voltage is adjustable and set by connecting a resistor divider network between the output and adjustment pins.
3. Adjustment (ADJ): This pin is used to adjust the output voltage. By connecting a resistor between the output pin and the adjustment pin and another resistor from the adjustment pin to ground, the output voltage can be set according to the formula \( V_{\text{out}} = V_{\text{ref}} \times (1 + \frac{R_2}{R_1}) + I_{\text{adj}} \times R_2 \), where \( V_{\text{ref}} \) is typically 1.25V.
The LM317DCY offers flexible output voltage settings and is used in various applications requiring stable voltage supply.
1. Input (IN): This pin is where the unregulated input voltage is applied. The voltage applied here should be higher than the desired output voltage to ensure proper regulation.
2. Output (OUT): This pin provides the regulated output voltage. The output voltage is adjustable and set by connecting a resistor divider network between the output and adjustment pins.
3. Adjustment (ADJ): This pin is used to adjust the output voltage. By connecting a resistor between the output pin and the adjustment pin and another resistor from the adjustment pin to ground, the output voltage can be set according to the formula \( V_{\text{out}} = V_{\text{ref}} \times (1 + \frac{R_2}{R_1}) + I_{\text{adj}} \times R_2 \), where \( V_{\text{ref}} \) is typically 1.25V.
The LM317DCY offers flexible output voltage settings and is used in various applications requiring stable voltage supply.
Manufacturer
The LM317DCY is a voltage regulator manufactured by Texas Instruments. Texas Instruments (TI) is an American technology company primarily known for designing and manufacturing semiconductors and various integrated circuits. Founded in 1930 and headquartered in Dallas, Texas, TI is one of the largest semiconductor companies globally. It serves a wide range of industries, producing products used in everything from consumer electronics and computers to automotive and industrial applications. TI is particularly noted for its contributions to the development of analog and embedded processing products, which include products like the LM317DCY.
Application
The LM317DCY is a versatile adjustable voltage regulator commonly used in various applications. It is often utilized in power supply circuits to provide a stable output voltage ranging from 1.25V to 37V with a maximum output current of 1.5A. Application areas include:
1. Power Supplies: For both fixed and variable output voltage.
2. Battery Chargers: To ensure precise charging by maintaining constant voltage/current.
3. LED Drivers: For regulating current flow in LED circuits.
4. Current Regulators: In precision current limiters and constant current sources.
5. Embedded Systems: Providing reliable power to microcontrollers and other digital components.
6. Audio Equipment: For noise-free power to audio circuits.
These features make it suitable for hobbyist projects and professional electronics.
1. Power Supplies: For both fixed and variable output voltage.
2. Battery Chargers: To ensure precise charging by maintaining constant voltage/current.
3. LED Drivers: For regulating current flow in LED circuits.
4. Current Regulators: In precision current limiters and constant current sources.
5. Embedded Systems: Providing reliable power to microcontrollers and other digital components.
6. Audio Equipment: For noise-free power to audio circuits.
These features make it suitable for hobbyist projects and professional electronics.
Package
The LM317DCY is a voltage regulator with a SOT-223 package type. The SOT-223 is a small, surface-mount package that is commonly used for power devices, and is known for its compact size and efficient heat dissipation properties.
