LM317 Power Supply Adjustable Voltage Regulation Module Digital

Discover the LM317 Power Supply Adjustable Voltage Regulation Module Digital — a standout decor pick featuring adjustable design for dependable, everyday performance.

Specifications

Brand Name: Aideepen

Condition: New

Type: Module

Features:

1. The adjustable power supply circuit using the LM317 three-terminal adjustable voltage regulator IC is simple and reliable in performance.

2. The LM317 current-expansion circuit module, by connecting an external high-power PNP transistor (TIP36), enables the LM317 to deliver up to 3A output current (requires a larger heat sink for the power transistor) and includes short-circuit protection.

3. For small voltage drops and currents below 2A, the onboard heat sink suffices. If current exceeds 2A with high input/output levels, replace the TIP36 PNP transistor with a larger heat sink.

4. The module operates as a series voltage regulator circuit, adjusting the output voltage by modulating the conduction level of its internal switching transistor.

5. Features short-circuit protection; brief output shorts will not damage components. Includes input rectification circuit for non-polarity input.

Product Specifications:

DC Input: DC 5-30V

AC Input: AC 3.5-21V

DC Output: DC 1.25-27V

Minimum Input-Output Voltage Drop: 3V (Step-down regulation; output is always lower than input)

Maximum Current: 3A

PCB Dimensions: 88mm (L) × 47mm (W)

Product Dimensions: 88mm (L) × 65mm (W) × 55mm (H)

Circuit Principle:

The TIP36 transistor and resistor R4 form a current-limiting circuit. Resistor R5 serves as a sink resistor, ensuring the operating current within the LM317 circuit does not exceed the base current of the TIP36 transistor. Resistor R4 functions as a short-circuit protection resistor. During a short circuit, when current exceeds the limit value, the voltage drop across R4 increases, reducing the emitter-base voltage of the TIP36. This prevents the TIP36 from conducting. The current flowing through resistor R5 enters the LM317's input terminal. If the current exceeds the LM317's maximum output current, its internal overcurrent and overheat protection circuits activate. This automatically reduces the LM317's output current, achieving short-circuit protection.

Product List:

Kit 1:

LM317 Power Regulator Module DIY Kit (Unassembled, Requires Self-Soldering)

Kit Contents (Shipping List):

PCB Board * 1

5.1K Resistor * 1

120Ω Resistor * 1

1N4007 Diode * 1

2W 22Ω Resistor * 1

5W 0.22Ω Resistor * 1

5mm Red LED * 1

104 Ceramic Capacitors * 2

25V 10μF Capacitor * 1

50V 470μF Capacitor * 1

50V 1000μF Capacitor * 1

5K Fixed-Leg Potentiometer * 1

Potentiometer Cap * 1

KF301-2P Terminal Block * 2

M3*8 Screws * 3

LM317 *1

23*16*25 Heat Sink *1

TIP36 *1

50*45*18 Heat Sink * 1

M3*6 Self-Tapping Screws* 3

Kit Two:

1 x Pre-Assembled LM317 Power Regulator Module (Fully soldered, ready to use upon receipt)

Options

• Color: LM317 Module, DIY

Frequently Asked Questions

Q: What is the LM317 Power Supply Adjustable Voltage Regulation Module?

A: The LM317 Power Supply Adjustable Voltage Regulation Module is a quality decor pick. The adjustable power supply circuit using the LM317 three-terminal adjustable voltage regulator IC is simple and reliable in performance.

Q: How do I use the LM317 Power Supply Adjustable Voltage Regulation Module?

A: The LM317 Power Supply Adjustable Voltage Regulation Module is ready to use right out of the box and makes an easy addition to your decor lineup.

Q: Why choose the LM317 Power Supply Adjustable Voltage Regulation Module?

A: The LM317 Power Supply Adjustable Voltage Regulation Module stands out in our decor range — The LM317 current-expansion circuit module, by connecting an external high-power PNP transistor (TIP36), enables the LM317 to deliver up to 3A output current (requires a larger heat sink for the power transistor) and includes short-circuit protection.