5V – 4A Buck Converter using NR110E

This powerful buck converter can efficiently produce 5 V@4A with an input voltage between 7V to 31V. The project is built using the NR110E chip from Sanken Semiconductor. The IC integrates the power MOSFET. With current mode control, ultra-low ESR capacitors, such as ceramic capacitors are used. The ICs have protection functions such as Overcurrent Protection (OCP), Undervoltage Lockout (UVLO), and Thermal Shutdown (TSD). An adjustable Soft-start by an external capacitor C4 prevents the excessive inrush current at start-up. The feature of increasing efficiency at light loads allows the project to be used in energy-saving applications. Due to the ICs integrating phase compensation circuit the number of external components count is low. Screw terminal provided for easy input and output connections. D2 Power LED indicates the output. The project provides an efficiency of up to 94%.

Features

• Input Supply 7V to 31V
• Output 5V DC
• Maximum Load 4 Amps
• Operating Frequency 350Khz
• Efficiency Up to 94%
• Current Mode PWM Control
• Soft Start Function
• Over Current Protection (Drooping) Auto Restart – Threshold 5.5Amps
• Thermal Shutdown (Auto Restart) – Threshold 165 Degree Cent.
• Thermal Shutdown Restart Hysteresis of Temperature 20 Degree Cent.
• Undervoltage Lockout
• PCB Dimensions 43.18 x 43.18mm
• 4 X 2.5MM Mounting Holes

Connections and Other Details

• CN1: Pin 1 = 7V to 31V DC Input, Pin 2 = GND
• CN2: Pin 1 = 5V DC Output, Pin 2 = GND
• D2 LED: Output LED