Unisonic Technologies LM317G

The LM317G is a popular adjustable linear voltage regulator from Unisonic Technologies. It is designed to supply a variable output voltage that can be set by external resistors. The LM317G provides a stable output and is used in various applications requiring regulated voltages. Functions - Voltage Regulation: The LM317G maintains a constant output voltage regardless of changes in input voltage or load conditions. - Adjustable Output: The output voltage can be adjusted from 1.25V to 37V with the proper resistor configuration. - Thermal Protection: It includes thermal overload protection to prevent damage due to excessive heat. - Short Circuit Protection: The IC ensures safety by limiting the output current to prevent damage during a short circuit. Applications - Power Supplies: Used in creating adjustable power supplies for circuits that require specific voltage levels. - Battery Chargers: Can act as a voltage regulator in battery charging applications. - Test Equipment: Utilized in laboratory setups for providing steady voltages. - Audio Equipment: Used in audio devices that require stable operating voltages for circuit stability. - Microcontroller Supply Voltages: Provides regulated power to microcontrollers and other digital circuits. Alternative Parts 1. LM317: The standard version of the adjustable voltage regulator, often referenced for comparison. 2. LM1117: Another low dropout voltage regulator with adjustable options. 3. LM338: Similar to LM317, but offers higher current output. 4. LT1085: A linear voltage regulator with similar adjustable capabilities. 5. LDO Regulators (Low Drop-Out): Various manufacturers offer LDO regulators that can be considered as alternatives depending on load current and dropout voltage requirements. Embedded Modules - LM317 Module Boards: Various PCB modules are available that incorporate the LM317G with support components for easy use. - Adjustable Power Supply Modules: Modules featuring the LM317, often with potentiometers for easy voltage adjustment. - DIY Power Supply Kits: Kits that utilize the LM317G in their design, often available for educational purposes or hobbyist projects. Q&A Q1: What is the output voltage range of the LM317G? A1: The LM317G can provide an adjustable output voltage range from 1.25V to 37V, depending on the resistor configuration used. --- Q2: What are the main protections included in the LM317G? A2: The LM317G includes thermal overload protection and short circuit protection, which safeguard the IC against overheating and current surges. --- Q3: Can the LM317G be used to charge batteries? A3: Yes, the LM317G can be employed in battery charging circuits by configuring the output voltage to match the battery's charging requirements. --- Q4: What components are typically required to set the output voltage of the LM317G? A4: To set the output voltage, two external resistors are typically used to create a voltage divider, along with a capacitor for stability. --- Q5: Are there any considerations when using the LM317G in high-current applications? A5: Yes, when using the LM317G in high-current applications, proper heat sinking is essential to dissipate heat, as the regulator can become hot and trigger thermal protection if the power dissipation exceeds its limits.