LM317 DC-DC Adjustable Voltage Regulator Power Supply Module
Description:
The LM317 is a popular adjustable three-terminal positive voltage regulator integrated circuit. When used in a power supply module, it provides a versatile and efficient solution for regulating DC voltage. Here's how it's typically used and its specifications:
Use:
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Voltage Regulation: The LM317 can be configured to provide a regulated output voltage that can be adjusted over a wide range. By connecting external resistors, you can set the output voltage to the desired level.
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Power Supply: It's commonly used as a component in power supply modules to provide a stable DC voltage output. These modules often include additional components for filtering, protection, and voltage adjustment.
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Voltage Conversion: The LM317 can also be used for voltage conversion, stepping down higher voltages to lower ones. However, it's important to note that it's a linear regulator, which means it dissipates excess voltage as heat.
Specifications:
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Input Voltage Range: Typically, the LM317 can handle input voltages up to 40V, although this can vary depending on the specific model and manufacturer.
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Output Voltage Range: The LM317 can provide output voltages ranging from approximately 1.25V to the input voltage minus a small dropout voltage (usually around 1.5V).
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Output Current: The maximum output current depends on factors like input-output voltage differential, power dissipation, and thermal regulation. With proper heat sinking, the LM317 can handle currents up to 1.5A.
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Adjustability: The output voltage of the LM317 is adjustable using two external resistors, allowing for precise voltage regulation.
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Line Regulation: Typically specified in terms of how much the output voltage changes for a given change in input voltage. The LM317 usually exhibits good line regulation characteristics.
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Load Regulation: Specifies how much the output voltage changes for a given change in load current. Again, the LM317 typically has good load regulation.
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Thermal Regulation: This refers to how the LM317 maintains a constant output voltage despite changes in temperature. Proper heat sinking is necessary for optimal thermal regulation.
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Package Type: The LM317 is available in various packages, including TO-220, TO-220FP, and TO-252, among others. The choice of package can affect power dissipation and heat sinking options.
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Protection Features: Some LM317 variants may include built-in protection features such as over-current protection, thermal shutdown, and short-circuit protection.
Overall, the LM317 DC-DC adjustable voltage regulator power supply module is a versatile and widely used component for various electronics projects requiring stable and adjustable DC voltage regulation.
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