A poorly laid out SMPS (Switched-Mode Power Supply) can lead to noise, heating, or even failure. Whether you’re a hobbyist or prototyping for production, smart component placement is key to a stable design.

⚠️ The Problem: Noisy or Unstable SMPS

Many beginners make the mistake of randomly placing components on the PCB. In an SMPS, this causes:

• High EMI (Electromagnetic Interference)

• Voltage spikes

• Overheating of critical parts

🔧 The Solution: Prioritize Current Path and Heat Management

Here are some beginner-friendly tips:

• Place the input capacitor close to the switching IC or MOSFET.

• Keep high-current loops (like input → switch → diode → ground) as small and tight as possible.

• Put snubber circuits near the switching node.

• Use thick copper traces or polygon fills for high-current paths.

💡 Practical Example: Designing a 12V to 5V Buck Converter

You’re building a buck converter for an IoT device. If you place the inductor far from the diode or switching MOSFET, you’ll face voltage spikes and losses.

✅ Fix: Place the inductor, diode, and output cap in a compact triangle right after the switch.

🧮 Sample Calculation: Copper Trace Width

For 2A current and 35µm copper:

Width ≈ 1.5mm for <10°C rise (IPC-2221 standard).

Use wider traces or pour if space allows.

🛠️ Product Suggestion (Made in India)

Make your SMPS project robust with these essentials:

• 🔩 MOSFET Modules – Perfect for switching circuits
  👉 Shop MOSFET Modules

• 🧪 Flux Paste – For precise, long-lasting solder joints

• 👉 Shop Flux Paste

🛍️ Shop now at SmartXProKits.in
🇮🇳 Support our work and India’s innovation—buy from our Make in India site!