LM317T Overview
STMicroelectronics LM317T is an adjustable voltage regulator monolithic integrated circuit intended for use as a positive adjustable voltage regulator. It is designed to supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V range.
LM317T Adjustable Regulator Features:
Output voltage: 1.2V~37V
Peak output current: 1.5A
0.01% line regulation
Ripple rejection: low as 80dB
Versatile protection methods: thermal shutdown, current limiting, SOA control
Floating operation
The LM317T stands out as an advanced forward adjustable voltage regulator. It has the advantages of LM317, but the voltage stabilization effect is more prominent.
The LM317T builds on the core strengths of the LM317 and takes performance up a notch to better support complex electronic design projects. It can dial in exactly the voltage required by the circuit (from 1.2V to 37V) and is capable of handling loads over 1.5A. This regulator simply implements these functions, using a resistor divider design to simplify the circuit design process.
Setting up the LM317T involves choosing two resistors that look just right. The resistor you choose not only plays a decisive role in the accuracy of the output voltage but also plays a decisive role in the long-term stability and reliability of the circuit. With parameters such as a minimum input voltage of 4.2V and an enhanced output current capability of 2.2A, the LM317T is versatile enough to adapt to different power inputs and maintain stable output under heavier loads.
LM317T has a very first-class safety performance and integrates comprehensive protection mechanisms such as current limiting, thermal shutdown, and SOA (Safe Operating Area) control. These features step in during overload or overheating situations to prevent circuit damage. This level of self-protection not only reduces the chance of circuit failure but also simplifies the circuit design process.
Comparison Between LM317 and LM317T
Although they are part of the same family, the LM317 and LM317T voltage regulators have subtle differences and can be customized for different uses. In-depth experimentation in different circuits can reveal their respective characteristics and how they best meet different technical needs.
LM317: Master of Precision
Using the LM317, you can immediately appreciate its ability for precise voltage control. This voltage regulator excels at stabilizing electrical equipment that is not too powerful, such as complex laboratory instruments or high-fidelity audio equipment. The precise output voltage is adjusted by connecting and adjusting a tiny resistor to the pin, a process similar to fine-tuning a precision instrument, emphasizing the role of voltage in the LM317's finely controlled circuitry.
LM317T: Power Source
Switching to LM317T, its advantages in handling high-power equipment become apparent. Thanks to the TO-220 package's strong heat dissipation capabilities, it can easily handle higher currents. In applications such as powering high-power LED arrays or driving motors, the LM317T ensures a stable current supply without performance degradation due to overheating. Observing the regulator stay cool under heavy load demonstrates the LM317T's reliability and efficiency in more demanding operations.
Mastering the Pins
The key point for the LM317 and LM317T is to become familiar with their pin functions. Regardless of the model, the setup requires labeling and connecting the regulation, output, and input pins according to the needs of the circuit. Although the process may seem simple, it requires a firm grasp of voltage regulation principles to ensure the effectiveness and durability of the circuit. The precise soldering of each pin directly affects the overall functionality of the circuit.
LM317 & LM317T Pin Structure & Functions
LM317 can accurately regulate voltage in small and medium power circuits, but LM317T performs better in circuits with higher power handling. Understanding their operating characteristics and how to utilize their pinout is a priority.
In summary, the LM317 and LM317T voltage regulators are essential tools in the electronic design toolbox due to their unique features and wide range of performance. Leveraging the unique qualities of these regulators allows designers to solve a variety of power management problems with ingenuity and adaptability. Whether addressing thermal challenges, managing board space constraints, balancing cost and performance, or fine-tuning voltage accuracy, the LM317 and LM317T provide solutions that precisely guide projects toward their goals. By thoroughly understanding the advantages and needs of each circuit, you can better select the voltage regulator that controls the circuit's voltage.
Where to use LM317T?
When it comes to variable voltage regulation requirements LM317T would most likely be the first choice. Apart from using it as a variable voltage regulator, it can also be used as a fixed voltage regulator, current limiter, Battery charger, AC voltage regulator, and even as an adjustable current regulator. One notable drawback of this IC is that it has a voltage drop of about 2.5 across it during regulation, so if you looking to avoid that problem look into the other equivalent IC’s given above.
So, if you are looking for a variable voltage regulator to deliver current up to 1.5A then this regulator IC might be the right choice for your application.
LM317T Applications
• Used for Positive voltage regulations
• Variable power supply
• Current limiting circuits
• Reverse polarity circuits
• Commonly used in Desktop PC, DVD and other consumer products
• Used in motor control circuits
Conclusion
Make a theoretical system actual by providing stable voltages with this standard LM317T linear regulator from STMicroelectronics. This voltage regulation device's single output can produce a current up to 0.4(Typ) A. With an adjustable output that has a voltage of 1.2 to 37 V, this is power management at its best. Maintain a constant voltage level with a load regulation of 0.5% and line regulation of 0.04%/V. This product comes in rail packaging to keep individual parts separated and protected. This voltage regulation device has an operating temperature range of 0 °C to 125 °C. Its polarity is positive.
In essence, the LM317T embodies the ultimate development in voltage regulation technology, providing flexible and safe solutions for modern circuit designs. Its ability to adapt to a variety of power conditions, coupled with its protection features, makes it a reliable choice for ensuring the smooth operation of your circuits.
Download datasheets for STMicroelectronics LM317T.
Written by Jack Zhang from AIChipLink.
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