Switch Mode Power Supplies (SMPS) are excellent for efficient power conversion, but getting precise voltage regulation is key—especially when powering sensitive electronics like microcontrollers or RF modules. For Indian engineers and prototypers, improving voltage accuracy can mean the difference between stable performance and erratic behavior.

🔧 The Problem: Inaccurate Output Voltage

Many SMPS circuits suffer from voltage drift due to poor feedback loop design or incorrect resistor selection in the voltage divider. This causes unstable operation, especially under changing loads.

✅ The Solution: Calibrate the Feedback Loop

Use high-precision resistors in the feedback divider and choose an accurate reference voltage IC. Also, keep the feedback trace layout short and away from high-frequency switching paths to reduce noise and improve response time.

🔍 Practical Example: 5V SMPS for an IoT Project

Suppose you’re building a 5V supply for a Wi-Fi-enabled microcontroller. You use a basic buck converter, but your voltage reads 4.7V under load, causing random reboots. By adjusting the feedback resistor ratio (R1 and R2), you can restore a stable 5V output.

🧮 Sample Calculation: Voltage Divider Setup

For a 5V output and a 1.25V reference:
Vout = Vref × (1 + R1/R2)
Set R2 = 1kΩ, solve for R1:
5 = 1.25 × (1 + R1/1k) → R1 = 3kΩ

🛒 Product Suggestion: Made in India Components

• 🧩 [Shop precision resistors]

• ⚡ [Shop SMPS controllers]

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