LM2596 Adjustable Buck Converter

This repository contains the schematic for an adjustable DC-DC buck converter based on the LM2596HVT ADJ switching regulator.
The circuit efficiently steps down a higher DC voltage to a lower, adjustable output voltage.

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Overview

The LM2596 is a popular high efficiency buck regulator capable of delivering up to 3A output current.
This design includes input/output filtering, a Schottky diode for fast switching, an adjustable feedback network, and an enable pin for power control.

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Circuit Description

Main Components

• U1 – LM2596HVT-ADJ
  Adjustable switching regulator.

  • Pin 1: VIN
  • Pin 2: OUTPUT
  • Pin 3: GND
  • Pin 4: FB (Feedback)
  • Pin 5: ON/OFF (Enable)

• L1 – 33µH Inductor
  Smooths switching current and stores energy.

• D1 – 1N5822 Schottky Diode
  Fast-recovery diode used for inductor flyback current.

• C1 – 680µF Input Capacitor
  Reduces input ripple and stabilizes the supply.

• C2 – 220µF Output Capacitor
  Filters output and reduces ripple.

• R1 – 10kΩ & R2 – 5kΩ
  Feedback voltage divider used to set the output voltage.
  Adjusting R1 changes Vout.

• P1 (Input Connector)
  VIN+ / VIN−

• P2 (Output Connector)
  VOUT+ / VOUT−

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How the Circuit Works

1. DC input enters through P1.
2. LM2596 switches internally at high frequency to step down voltage.
3. L1 and D1 form the main power stage that converts the switching waveform into smooth DC.
4. R1 + R2 feed back a fraction of the output voltage to the FB pin to regulate the output.
5. C1 and C2 filter both input and output to minimize ripple.
6. Regulated output is available through P2.

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Schematic

[LM2596 Buck Converter Schematic]

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Working

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Features

• Adjustable output voltage
• High efficiency switching regulator
• Large filtering capacitors
• Suitable for up to 3A loads (depending on cooling)

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Applications

• Battery powered devices
• Robotics and embedded systems
• DIY power supplies
• Microcontroller projects

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