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Quarter-brick DC-DC converters support PMBus interface

Posted: 26 Jun 2014  Print Version  Bookmark and Share

Keywords:Murata  PMBus  DC-DC converter  ARM7  Power over Ethernet 

Murata has unveiled its DBQ series of isolated digitally controlled DC-DC converters. The 420W regulated DBQ0135V2 model is the first in a series of DC-DC converters to include a PMBus-compatible digital interface, the company indicated.

The DBQ series is packaged in a standard quarter-brick format incorporating the advanced bus converter (ABC) pinout for PMBus communications to an isolated DC-DC converter.

The 12Vout DBQ0135V2 supports the TNV input voltage range of 36-75V with a typical efficiency of 95.2 per cent. To achieve this level of performance, the DBQ uses a 32bit ARM7 processor and proprietary firmware to control all critical functions of the module. The module provides a digital interface supporting the PMBus standard for digital power management in systems used in applications such as MicroTCA, servers, storage, networking equipment, Power over Ethernet (PoE) wireless networks, and industrial and test equipment.

DBQ series

The PMBus interface provides power management features not previously available in an isolated, modular, quarter-brick DC-DC converter, Murata noted. By interfacing the DBQ to the system's I2C bus, a systems engineer can monitor critical system level performance requirements that include Vin, Iin, Vout, Iout and operating temperature. The PMBus can also be used to set warning flags for temperature, Vin, Vout, and Iout, and allows the user to customise parameters such as Vout, Vin turn on/off thresholds, output over voltage protection, output current limit and ramp-up characteristics.

The DBQ series droop load sharing option allows three modules to be connected together in parallel for added power or to provide redundancy in high-reliability applications. The converter also offers input to output isolation of 2.25kVDC as required for PoE applications.

A GUI and evaluation boards are available to assist the power engineer in designing modern power systems, added the company.

- Graham Prophet
  EE Times Europe





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