5V – 4A Buck Converter using NR110E

Rajkumar Sharma
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SKU: EL134630
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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

Schematic

Parts List

NO	QNTY.	REF.	DESC	MANUFACTURER	SUPPLIER	SUPPLIER PART NO
1	2	CN1,CN2	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1247-ND
2	2	C1,C2	10uF/35V CERAMIC SMD SIZE 1210	MUARATA/YAGEO	DIGIKEY
3	1	C3	0.1uF CERAMIC SMD SIZE 0805	MUARATA/YAGEO	DIGIKEY
4	1	C5	10uF/16V CERAMIC SMD SIZE 1210	MUARATA/YAGEO	DIGIKEY
5	1	C6	47uF/16V CERAMIC SMD SIZE 1210	MUARATA/YAGEO	DIGIKEY
6	3	R6,C7,C8	DNP
7	1	D1	B560CQ FAST DIODE	DIODE INCORP	DIGIKEY	B560CQ-13-FDICT-ND
8	1	D2	LED RED SMD SIZE 0805	OSRAM	DIGIKEY	475-1278-1-ND
9	1	L1	10uH/10A	CHILISIN ELECTRONICS	DIGIKEY	553-BFSI00090908100M05TR-ND
10	1	R1	510K 1% SMD SIZE 0805	MUARATA/YAGEO	DIGIKEY
11	1	R2	22E 5% SMD SIZE 0805	MUARATA/YAGEO	DIGIKEY
12	1	R3	1K 5% SMD SIZE 0805	MUARATA/YAGEO	DIGIKEY
13	1	R4	18K 1% SMD SIZE 0805	MUARATA/YAGEO	DIGIKEY
14	1	R5	3.3K 1% SMD SIZE 0805	MUARATA/YAGEO	DIGIKEY
15	1	U1	NR111 SOIC8	SANKEN	DIGIKEY	NR111ECT-ND
16	1	C4	0.1uF/50V CERAMIC SMD SIZE 1206	MUARATA/YAGEO	DIGIKEY