Lm2596 Dc Dc Step Down Schematics

1. Lm2596 Dc Dc Step Down Schematics Kit
2. Lm2596 Step Down Power Converter

Typical Application Circuit for LM2596, 5V @ 3A Step-Down Converter Using the LM2596-ADJ. The LM2596 regulator is monolithic integrated circuit ideally suited for easy and convenient design of a step-down switching regulator (buck converter). It is capable of driving a 3A load with excellent line and load regulation. DC-DC Buck Converter Step Down Module LM2596 Power Supply is a step-down(buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation. These devices are available an adjustable output version. The LM2596 series operates LM2596 Switching Type DC to DC Step Down Regulator Buck Module.

Introduction: DC – DC Voltage Step Down Switch Mode Buck Voltage Converter (LM2576/LM2596)

DC-DC Buck Converter Step Down Module LM2596 Power Supply is a step-down(buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version. Only US$2.99, buy best lm2596 dc-dc 1.3v - 37v 3a adjustable buck step down power module 150khz internal oscillation frequency with digital display over-heat and short circuit protection function sale online store at wholesale price. LM2596 DC to DC step down regulator, adjustable +1.23 to 35vdc output, 2A. Ideal for battery operated projects requiring a regulated powersupply.

Making a highly efficient buck converter is a tough job and even seasoned engineers require multiple designs to come to the right one.

A buck converter (step-down converter) is a DC-to-DC power converter , which steps down voltage (while stepping up current) from its input (supply) to its output (load).

Switching converters (such as buck converters) provide much greater power efficiency as DC-to-DC converters than linear regulators, which are simpler circuits that lower voltages by dissipating power as heat, but do not step up output current.

The basic operation of the buck converter has the current in an inductor controlled by two switches (usually a transistor and a diode). In the idealized converter, all the components are considered to be perfect. Specifically, the switch and the diode have zero voltage drop when on and zero current flow when off, and the inductor has zero series resistance. Further, it is assumed that the input and output voltages do not change over the course of a cycle (this would imply the output capacitance as being infinite).

Step 1: LM2576/2596, 3-A Step-Down Voltage Regulator

Features

1. 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output Versions
2. Adjustable Version Output Voltage Range,1.23 V to 37 V (57 V for HV Version)
3. Specified 3-A Output Current
4. Wide Input Voltage Range: 40 V Up to 60 V for HV Version
5. Requires Only 4 External Components
6. 52-kHz Fixed-Frequency Internal Oscillator
7. TTL-Shutdown Capability, Low-Power Standby Mode
8. Monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator
9. High Efficiency

Lm2596 Dc Dc Step Down Schematics Kit

Step 2: PCB Design

I have used EasyEda to design the 2-layer PCB.

If anyone wants i can always post the gerber files for you.

Most important design consideration to be kept in mind is that the ground terminals of the diode,caps and IC should be as close as possible.

Also the track length of Output pin of IC (pin 2) to inductor should be as short as possible.

Step 3: Ordering the PCBs

Now we have got the PCB design and it’s time to order the PCB’s. For that, you just have to go to JLCPCB.com , and click on “QUOTE NOW” button.

JLCPCB are also sponsor of this project. JLCPCB (Shenzhen JLC Electronics Co., Ltd.), is the largest PCB prototype enterprise in China and a high-tech manufacturer specializing in quick PCB prototype and small-batch PCB production. You can order a minimum of 5 PCBs for just $2. To get the PCB manufactured, upload the gerber file you downloaded in the last step. Upload the .zip file or you can also drag and drop the gerber files. After uploading the zip file, you’ll see a success message at the bottom if the file is successfully uploaded. You can review the PCB in the Gerber viewer to make sure everything is good. You can view both top and bottom of the PCB. After making sure the PCB looks good, you can now place the order at a reasonable price. You can order 5 PCBs for just $2 plus shipping. To place the order, click on “SAVE TO CART” button. My PCBs took 2 days to get manufactured and arrived within 20 days using standard registered post delivery option. There are fast delivery options also available.PCBs were well packed and the quality was really good.

Step 4: Assembling and Working

Before ordering the PCBs, always make sure that the layout and circuit is working.

I tested the circuit on perf board and then on home etched PCBs and then I ordered the PCBs.

Lm2596 Step Down Power Converter

In my circuit I have added additional points for PIN 4 and 5 to be connected to arduino or other MCU.

Pin 5 can be used as an on/off switch (active LOW), so when PIN 5 is grounded the buck converter is on and when PIN 5 is above 1.8V the converter is off.

PIN 4 is the feedback pin and with the help of PWM from arduino/MCU we can control the output voltage using an additional resistor at the resistor divider circuit.

At the end I would say that the LM2576 or LM2596 are one of the most easy buck converter IC to work with and are easily available at local electronics shop and online.

Also this IC is very forgiving and works with poor designed layouts.

I would recommend using heatsinks on IC to increase their life.

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Description

LM2596HVS is a High-voltage input version of LM2596S low-cost high-amperage Switch mode DC/DC Buck power supply module. The module can accept upto 50V input voltage. Get any voltage between 4.5V to 35V (Input voltage must be greater than output voltage).

Features

• A Bourns 3296 25-turn potentiometer is installed on board to facilitate granular output voltage settings
• Pin spacing of 0.6″ x 1.5″ to easily affix into the 0.1″ pin spacing of most breadboard and perfboard.
• The module is up to 94% efficient. The higher the output voltage the higher the efficiency. The LM2596 datasheet linked to above provides more specific details regarding efficiency.
• Up to 3A of supply current. Depending on input and output voltage a heatsink should be affixed the LM2596 (not included)
• Large output range of 3.0V-35VDC
• Low dropout of 1-2VDC, depending on load
• Only 4 pins are required to be soldered onto the board

Applications

• Solar Power Regulator. Can regulate varying PV input to any fixed voltage.
• Robot Power Supply for Digital Circuits (3.3V, 5V, or Adjustable ) and Motor Drivers
• DC Power Supply for Amplifiers
• Compact Low weight power supply for Quadcopter and other flying robots.
• Regulated power supply for Raspberry pi, Arduino and other embedded microcontroller boards

Technical Specifications

Documents and Downloads

• LM2596HVS Datasheet

Package Includes

• 1x LM2596HVS DC 3A Step-Down Adjustable Module – 50V Input (Tested / QC-OK)