LM2596S Buck Voltage Regulator (3-Potentiometer / 3A)

The LM2596S Adjustable Buck Converter is a versatile step-down switching regulator designed to drive loads up to 3.0A with high efficiency. Unlike standard modules, this version features three precision potentiometers, allowing for granular control over output voltage, current limiting, and charging status. This makes it an ideal solution for constant current (CC) and constant voltage (CV) applications, such as high-power LED drivers or DIY battery chargers.

Key Features

• 
  

  Triple Adjustment Control: Features three potentiometers for independent adjustment of output voltage, maximum current limit, and charge indicator threshold.

  
  


• 
  

  Dual Operating Modes: Capable of switching between Constant Voltage (CV) and Constant Current (CC) modes, indicated by an onboard LED.

  
  


• 
  

  High Efficiency: Utilizes switching regulator technology to achieve up to 92% efficiency, minimizing heat generation.

  
  


• 
  

  Charge Status Indicators: Includes dedicated LEDs to show when the module is in CC mode and when a connected battery has reached its charging threshold.

  
  


• 
  

  Robust Protection: Based on the monolithic LM2596 IC, ensuring excellent line and load regulation across a wide input range.

  
  

Technical Specifications

Adjustment Guide (The 3 Potentiometers)

1. 
   

   Voltage Control (V-ADJ): Adjusts the output voltage level.

   
   


2. 
   

   Current Limit (I-ADJ): Sets the maximum output current. Turning clockwise increases the allowed current.

   
   


3. 
   

   Charge Indicator (CH-LED): Controls the current threshold at which the "Charge" LED turns off (useful for determining when a battery is nearly full).

   
   

Board Layout

Applications

• 
  

  Battery Charging: Ideal for charging Lithium-ion or Lead-acid batteries with safe CC/CV curves.

  
  


• 
  

  LED Driving: Providing a constant current to high-power LEDs to prevent thermal runaway.

  
  


• 
  

  Lab Power Supply: Creating a portable, adjustable power source for mechatronics prototyping.

  
  


• 
  

  Solar Systems: Stepping down higher-voltage solar panel outputs to a regulated battery voltage.