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SMPS High-Efficiency Design Tips

SMPS

🛠️ The Problem :

 

An SMPS that wastes power as heat shortens battery life and needs larger heatsinks. Inefficiency usually comes from high switching losses (slow MOSFETs) and conduction losses (high-R<sub>DS(on)</sub> parts, lossy capacitors).

 


✅ The Solution :

 

  1. Choose low-gate-charge MOSFETs so they turn on/off faster.

  2. Use low-ESR output capacitors to slash ripple and dissipation.

  3. Keep high-current loops short on the PCB and add generous copper pours to cut resistive loss.

 


🔧 Practical Example :

 

A hobbyist in Pune upgraded a 12 V → 5 V buck converter that powered his Raspberry Pi. Swapping the TO-220 MOSFET for a logic-level, low-Qg SMD part and replacing standard electrolytics with low-ESR polymer caps pushed full-load efficiency from 82% to 93%. The board now runs cooler and the Pi never brown-outs during camera bursts.

 


🧮 Sample Calculation :

 

Conduction loss in the MOSFET:

For 3 A load and 20 mΩ device:

Pcond=32×0.02=0.18W

A previous 80 mΩ part wasted 0.72 W — 4× higher!

 


🛒 Product Suggestion – Made in India

 

  • Grab a MOSFET tuned for switching efficiency ➜

  • Pair it with a low ESR capacitor kit

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

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