LM317T Variable Voltage Regulator circuit
The LM317T voltage regulator is widely utilized in various electronic applications due to its versatility and robust performance characteristics. It operates by adjusting the output voltage based on the resistance values connected to its adjustment pin, allowing for a precise output voltage selection. The device typically requires two external resistors to set the desired output voltage, which can be calculated using the formula Vout = Vref (1 + R2/R1) + Iadj * R2, where Vref is approximately 1.25V.
In addition to its adjustable output, the LM317T includes integrated protection features, such as current limiting, which prevents excessive current draw that could damage the regulator or connected components. The thermal shutdown feature is crucial for preventing overheating; if the junction temperature exceeds a certain threshold, the regulator will automatically shut down until it cools to a safe operating temperature.
The package design of the LM317T typically includes a TO-220 or similar housing, facilitating heat dissipation through a heat sink connection. This is essential for maintaining performance in high-current applications. The device is also compatible with various input voltages, making it suitable for battery-powered devices, power supplies, and other applications requiring stable voltage regulation.
In summary, the LM317T is an essential component for designing reliable power supply circuits in electronic devices, providing adjustable output, built-in protection, and ease of integration into various applications.The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof..
🔗 External reference
Related Circuits
The two circuits below illustrate the application of the 555 timer to activate a relay for a specified duration by pressing a momentary normally open (N/O) push button. The circuit on the left can be used for longer time...
PC parallel port can be very useful I/O channel for connecting your own circuits to PC. The PC's parallel port can be used to perform some very amusing hardware interfacing experiments. The port is very easy to use when...
The circuit is a temperature-to-pulse-width converter. The LM3524 is used to convert the output of an LM135 temperature transducer into a pulse width that can be measured by a digital system, such as a microprocessor-controlled data acquisition system. In...
A low phase noise voltage-controlled oscillator circuit is presented, specifically integrated within the MAX2605-2609 voltage-controlled oscillator series. The circuit features a tuning voltage control terminal, allowing for adjustable oscillation frequency through a DC voltage input. The output of the...
Many modern devices have shutdown circuits that are designed to remove power from the device when the voltage rises above a predetermined threshold. This circuit blows a fuse to protect the device under power. Shutdown circuits are critical components in...
The diagram illustrates a 5W audio amplifier circuit constructed using power transistors BD139 and BD140 for the final amplification stage. This compact amplifier serves as a general-purpose amplifier suitable for applications such as computer audio, radio, MP3 players, and...