The LM317LK-T92-B is an adjustable 3-terminal positive voltage regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). It is capable of supplying more than 1.5A over an output voltage range of 1.2V to 37V. The device is designed for use in a wide range of applications, including power supplies, battery chargers, and adjustable regulators. Its internal current limiting and thermal shutdown features provide protection against overload and overheating conditions.

Applications

• Adjustable Power Supplies: Used to create variable voltage power supplies for laboratory and industrial applications.
• Battery Chargers: Employed in battery charging circuits to regulate charging voltage and current.
• Constant Current Regulators: Utilized in constant current regulator circuits for LED drivers and other applications.
• Bench Power Supplies: Integrated into bench power supplies for providing adjustable voltage outputs.
• Linear Regulators: Used as a linear voltage regulator in a wide range of electronic devices.

Features

• Adjustable Output Voltage: Output voltage can be adjusted from 1.2V to 37V.
• Output Current Greater than 1.5A: Capable of supplying a continuous output current of 1.5A or more.
• Internal Current Limiting: Provides protection against output overload conditions.
• Thermal Overload Protection: Shuts down the regulator when the junction temperature exceeds a safe limit.
• Floating Operation: Can be used in floating applications where neither the input nor output is grounded.

Benefits

• Versatile Applications: Suitable for a wide range of voltage regulation applications.
• Overload Protection: Provides protection against damage from output overload conditions.
• Thermal Protection: Prevents damage from overheating.
• Easy to Use: Requires only two external resistors to set the output voltage.
• Cost-Effective: Offers a cost-effective solution for adjustable voltage regulation.

Additional Details

The LM317LK-T92-B is typically packaged in a TO-92 package. The output voltage is set by two external resistors connected as a voltage divider between the output and the adjust pin. The regulator maintains a constant 1.25V between the output and adjust pins, allowing the output voltage to be precisely set. The device's internal current limiting and thermal shutdown features help to prevent damage from overload and overheating conditions, making it a robust and reliable voltage regulator. Care should be taken to provide adequate heatsinking if the regulator is operating at high output currents and/or high input-output voltage differentials.