SMPS (Switched-Mode Power Supplies) are efficient, but vulnerable to voltage transients—sudden spikes that can damage sensitive components. Good transient handling ensures long-term reliability.

⚠️ The Problem: Voltage Spikes Can Kill Your SMPS

When switching inductive loads or powering from unstable sources, voltage transients (spikes) can appear at the input or output of your SMPS. These can cause:

• Component burnout

• Reset loops in MCUs

• Electromagnetic interference (EMI)

🔧 The Solution: Snubbers, TVS Diodes & Capacitors

To control transients, use:

• TVS Diodes (Transient Voltage Suppressors) across input/output rails

• RC Snubber Circuits across switching elements

• Electrolytic + Ceramic Capacitor combo for power line smoothing

TVS diodes clamp dangerous spikes instantly, saving your circuit.

💡 Practical Example: 12V SMPS for IoT Sensor Node

Say you’re using a 12V SMPS to power a Wi-Fi sensor. During switch-on or lightning surges, a 24V spike appears. Without protection, your ESP module resets or burns out.

✅ Fix: Add a 15V unidirectional TVS diode across the output. It clamps anything above 15V, protecting downstream devices.

🧮 Sample Calculation: TVS Selection

Target voltage: 12V
Choose a TVS diode with:

• Clamping Voltage: ~15V

• Peak Power Rating: >600W (for industrial cases)

🛠️ Product Suggestion (Made in India)

Build robust SMPS circuits with trusted Indian components:

• 🔋 TVS Diodes – Protect against voltage spikes
  👉 Shop TVS Diodes

• 🧪 Flux Paste – Get reliable, clean solder joints

• 👉 Shop Flux Paste

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