MOSFET High-Current Load Design – Made Easy!
⚠️ The Problem :
When switching high-current loads like motors or heating elements, MOSFETs are a great choice—but only if designed right! If you use the wrong type or don’t consider R<sub>DS(ON)</sub> (the drain-source resistance), the MOSFET will overheat and waste power.
🛠️ The Solution :
For high-current switching, use low R<sub>DS(ON)</sub> N-channel MOSFETs with proper heatsinking and gate drive. Logic-level MOSFETs like IRLZ44N can be driven directly from Arduino or ESP32 and handle up to 47A (with proper cooling).
💡 Practical Example
You’re designing a DIY battery charger with a 10A current path. Using a standard MOSFET with R<sub>DS(ON)</sub> = 0.1Ω wastes too much power and heats up fast. Switch to IRF3205 with R<sub>DS(ON)</sub> ≈ 0.008Ω and your system runs cooler and more efficiently.
📏 Sample Calculation
At 10A load:
That’s over 12x lower loss—crucial for battery-powered systems.
🛒 Product Suggestion :
Try ‘IRF3205 MOSFET’ or ‘heatsink TO-220’ for thermal safety:
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