3 W Dual-output isolated auxiliary supply for communication interfaces and measurement systems

This reference design presents a compact auxiliary supply providing two output voltage rails of 5 V, galvanically-isolated from each other, with a combined maximum output power of up to 3 W (i.e. 0.3 A output current per rail). Different lower voltage rails like 3.3 V, 2.5 V or 1.2 V are easily obtained by cascading a low-dropout linear voltage regulator (LDO) to the required output rail. The design targets applications like isolated communication interfaces and data acquisition systems in industrial automation, as well as many systems using sensors, voltage-level-shifters, digital isolators or opto-couplers, amongst others.

Main Specification

• Extremely compact (20 x 20 x 5.3) (L x W x H) (mm)
• Wide input voltage range from 18 to 32 V
• Non-isolated/Primary output voltage: 5.1 V ± 1%
• Isolated/Secondary output voltage (balanced load): 4.8 V ± 5%
• Isolated/Secondary output voltage (unbalanced load): 4.8 V ± 10%
• Output power up to 3 W
• Peak efficiency of 82 %
• WE-TDC-HV Coupled Inductor featuring 2 kV Isolation

Typical Applications

• Programmable Logic Controllers (PLC)
• Distributed Control Systems (DCS)
• Data Acquisition Systems (DAQ)
• Isolated Signal and Communication Interfaces
• Voltage level shifting
• Sensor and actuator systems

RD006 PCB Design files

RD006 PCB Fabrication files

Download: RD006