DIY High-Power Boost Converter (8-36V / 5A)

DIY High-Power Boost Converter (8-36V / 5A)By Creative For You

If you’ve ever needed to power a 24V device from a 12V battery or run a high-voltage LED strip from a standard power supply, you need a Boost Converter. In this project, we build a high-efficiency DC-to-DC step-up converter capable of delivering up to 5 Amps with fully adjustable voltage and current limits.Introduction: Why Build Your Own? Commercial modules are convenient, but building your own allows for better thermal management and a deeper understanding of power electronics. Because this circuit handles up to 5A, a breadboard just won't cut it—the high current would melt the plastic. For a project this powerful, a dedicated PCB is a must for safety and performance.

Supplies & ToolsThe Foundation: Professional PCBsTo handle the heat and current of a 5A boost converter, you need a high-quality board. For this project, I used JLCPCB. They have an incredible deal where you can get 5 PCBs and a Solder Stencil for just $5.Using a single Gerber file to order both the board and the stencil makes the assembly much cleaner. If you're starting a new project, you can Sign up here to get Free Coupons for your first order.

👉🏻JLCPCB.COM

Components

* Power MOSFET & Schottky Diode: The "muscle" of the circuit. *

Toroidal Inductor: High-saturation current type for 5A handling.

* Electrolytic Capacitors: Low ESR (e.g., 35V-50V rated) for input/output filtering.

* LM358 Op-Amp: For the current and voltage control loops.

* Multi-turn Potentiometers (10k): For precise tuning.

* Aluminum Heat Sinks: Essential for cooling.

Step 1: Ordering and Preparing the PCBWhen working with power electronics, trace thickness matters. When you upload your Gerber files to JLCPCB, you get professional-grade FR4 material that can withstand the heat much better than home-etched boards. Once your boards arrive (usually in less than a week), give them a quick wipe with isopropyl alcohol to ensure a perfect solder bond.

Step 2: Soldering the Low-Profile

ComponentsStart by soldering the smallest components first:

* Resistors and Small Diodes: Lay them flat against the board.

* The Op-Amp Socket: Using a socket is recommended so you don't overheat the chip during soldering.

* Potentiometers: These are placed at the edge for easy access.

Step 3: Power Handling & Thermal ManagementThis is the most critical step. The MOSFET and the Schottky diode will generate heat during the voltage step-up process.

* Apply Thermal Paste: Apply a small amount of thermal grease between the component and the heat sink. * Mechanical Fastening: Use a screw and nut to tightly secure the heat sink. If the heat sink is shared between components, ensure you use insulation pads (silicone or mica) to prevent a short circuit.

Step 4: The "Heart" - Inductor and Capacitors

* Inductor: Solder the large toroidal inductor. Ensure the wire leads are scraped clean of enamel before soldering to ensure a perfect connection.

* Capacitors: Watch the Polarity! The longer lead is positive (+), and the stripe on the side of the capacitor indicates negative (-).

Step 5: Wiring and First Power-UpBefore connecting a load, perform a "Smoke Test":

* Connect a DC input (e.g., 12V) to the input terminals.

* Use a multimeter to measure the output.

* Adjust the Voltage Pot: Turn the screw until you reach your desired output (e.g., 24V).

* Adjust the Current Pot: This sets the maximum "ceiling" for the amperage to protect your connected devices.

ConclusionYou now have a powerful, adjustable bench tool!

This converter is perfect for charging 24V battery banks, driving high-power COB LEDs, or powering laptops from 12V sources.By using a professional board from JLCPCB, you've ensured that your project is not only functional but durable enough for long-term use.