In high-efficiency SMPS (Switch Mode Power Supply) designs, MOSFETs are crucial for switching—but without proper thermal management, they can overheat and fail. For Indian electronics hobbyists and engineers, designing good thermal pathways is key to building reliable power supplies.

🔧 The Problem: Overheating MOSFETs in SMPS

MOSFETs generate heat during both conduction and switching. If not properly cooled, high temperatures can lead to thermal runaway, reduced efficiency, or total failure.

✅ The Solution: Calculate Power Loss and Use Heat Sinks

First, calculate power loss using Rds(on) and switching frequency. Then, add a heatsink or use a MOSFET with lower Rds(on). Also, ensure good PCB layout with wide copper traces for heat dissipation.

🔍 Practical Example: 60W SMPS Project

You’re using a MOSFET with Rds(on) = 0.1Ω, switching 3A:
Conduction loss = I² × R = 3² × 0.1 = 0.9W
That heat, if not managed, will overheat the component. By switching to a 0.03Ω MOSFET, the heat drops to just 0.27W—safe even without a heatsink in many cases.

🛒 Product Suggestion: Made in India Components

• 🔥 [Shop low Rds(on) MOSFETs]

• 🧊 Shop heatsinks

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