RD006 Reference Design

Wurth Elektronik

RD006 - 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.

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

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Title Updated Type Size (KB)
RD006 Reference Design 13-Sept-2022