Description
Specifications Table
Product Material – Plastic (TO-220 package)
Grade – Commercial/Industrial
Application – Voltage regulation, power supply circuits
Product Overview
The LM317 is a highly versatile adjustable voltage regulator IC designed to maintain a stable output voltage across varying input conditions. With an output range of 1.2V to 37V and a maximum output current of 1.5A, it is widely used in electronic circuits requiring precise voltage control. The IC features built-in thermal overload protection, short-circuit protection, and a floating operation for high-voltage applications. Its three-terminal design simplifies circuit integration, making it a preferred choice for both beginners and professionals. The LM317 operates efficiently with a typical dropout voltage of 2V, ensuring reliable performance even in low-input scenarios. Its robust construction in a TO-220 package allows for easy heat dissipation, enhancing durability in continuous-use applications. Whether used in lab experiments or prototyping, this IC delivers consistent voltage regulation with minimal external components.
FAQs
1. What is the maximum input voltage for the LM317 IC?
The LM317 can handle a maximum input voltage of 40V, though the output must remain within the 1.2V–37V range for optimal performance.
2. Can the LM317 be used for negative voltage regulation?
No, the LM317 is designed for positive voltage regulation. For negative voltages, consider using the LM337 IC, which is its complementary counterpart.
3. How do I adjust the output voltage of the LM317?
The output voltage is adjusted using two external resistors (R1 and R2) connected to the ADJ pin. The formula Vout = 1.25(1 + R2/R1) helps calculate the desired voltage.
4. Is a heat sink required for the LM317?
A heat sink is recommended when the IC operates at higher currents or input-output voltage differentials to prevent overheating and ensure longevity.
5. What are the alternatives to the LM317 for lower current applications?
For lower current requirements, the LM317L (100mA) or LM317M (500mA) variants can be used, offering similar functionality in smaller packages.
