SMPS High-Efficiency Component Guide – Pro Tips
⚡ The Problem: Low-Efficiency in SMPS Designs
When designing a Switch Mode Power Supply (SMPS), low efficiency can result in wasted power, excess heat, and reduced lifespan of components. This is especially problematic in compact or battery-powered systems where thermal and energy budgets are tight.
🛠️ The Solution: Use High-Efficiency Components
To fix this, choose low R<sub>DS(on)</sub> MOSFETs, fast-recovery diodes, and low-ESR capacitors. These components reduce switching and conduction losses, ensuring your SMPS runs cooler and uses energy more effectively.
🔧 Practical Example
Imagine you’re building a 12V to 5V 2A buck converter for a microcontroller-based IoT node. Using a general-purpose diode instead of a Schottky diode results in higher forward voltage drop and heat. Replacing it with an SS34 Schottky diode and a high-speed MOSFET improves efficiency by over 5%.
🧮 Sample Calculation
Let’s compare diode losses:
Standard diode: 0.7V × 2A = 1.4W loss
Schottky diode (SS34): 0.45V × 2A = 0.9W loss
Power saved = 0.5W, which is significant over time and in thermally sensitive enclosures.
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