ABB QSD(V)W050A0B DC-DC Converter Power Modules

ABB QSD(V)W050A0B Barracuda III Series DC-DC Converter Power Modules are designed to support intermediate bus applications where multiple low voltages are generated. The "D" version has a digital communications interface, while the "V" version has a standard control interface. The modules operate from a wide 36VDC to 75VDC input voltage range and provide up to 50A output current at output voltages from 9.6VDC to 12VDC. These devices also provide 600W output power from output voltages of 12.1VDC to 13.2VDC in a DOSA standard quarter-brick size. Other features include low output ripple and noise, constant switching frequency, -40°C to 85°C temperature range, and a base plate for better thermal performance. Protections include output overcurrent, overvoltage protection, and overtemperature.

ABB QSD(V)W050A0B Barracuda III Series DC-DC Converter Power Modules are ideal for applications such as distributed power architectures, intermediate bus voltage, servers and storage, fan assemblies, and networking equipment, including power over Ethernet (PoE).


  • Adjustable output voltage either tightly regulated or with active droop for connecting multiple modules in parallel
  • Digital communication interface with PMBus Rev.1.2 compliance (D versions)
  • Tunable transient response via PMBus
  • Standard control interface with on/off, remote sense, and output-voltage trim inputs (V versions)
  • Low output ripple and noise
  • Constant switching frequency
  • Output overcurrent, overvoltage, and overtemperature protections
  • Base plate for better thermal performance
  • Industry-standard, DOSA-compliant quarter-brick size (58.4mm x 36.8mm x 13.7mm)
  • 2250Vdc isolation tested in compliance with IEEE 802.3 PoE standards
  • CE mark 2014/35/EU directive
  • RoHS and REACH compliant


  • Distributed power architectures
  • Intermediate bus voltage
  • Servers and storage
  • Networking equipment, including PoE
  • Fan assemblies and other systems requiring a tightly regulated output voltage


  • 96% (48V input) peak efficiency
  • >95.6% flat efficiency from 55% to 100% rated output
  • 36VDC to 75VDC input voltage range
  • 12VDC typical output voltage
  • 50ADC maximum output current
  • 150kHz switching frequency
  • -40°C to +85°C operating temperature range

Characteristic Curves

Performance Graph - ABB QSD(V)W050A0B DC-DC Converter Power Modules
Published: 2018-09-07 | Updated: 2022-11-17