Digital quarter-brick DC/DC converter complies to DOSA
Designed for high reliability applications based on a 32-bit Arm processor that supports the latest PMBus commands for digital control and telemetry functions, digital quarter-brick DC/DC converters from Murata comply to DOSA (Distributed-power Open Standards Alliance) for product compatibility and standardisation.
The 600W, 12V output, digital quarter-brick DSQ, DCQ and DAQ converters support the full TNV input range of 36 to 75V, with a typical efficiency of 96 per cent at full load 48V in.
The series is designed to support droop mode current sharing of multiple modules for increased power output with tight load sharing. I/O isolation is 2,250V DC, with a functional insulation system. The converters carry the UL/CSA safety agency approvals. Options for the modules include a digital interface supporting the latest PMBus command set, parallel load sharing, positive or negative on/off logic, and options for standard analog DOSA pinout and a five-pin bus converter pinout. Application examples include telecommunications networking equipment, computing equipment, wireless base stations, PoE systems, MicroTCA, fan trays and test equipment.
The DSQ model includes a PMBus interface that provides a means (I2C bus) to configure output voltage, soft start parameters, input and output over-voltage protection limits, input under-voltage lockout, current limit and thermal shutdown. Telemetry functions include output voltage and current, input voltage and temperature, as well as indications for ‘power good’ and on/off status.
To support the PMBus, Murata Power Solutions offers an optional evaluation board that is supported by downloadable software with a user-friendly GUI. The evaluation boards and a GUI manual are available upon request.
The DSQ modules are designed, tested and qualified according to the industry standard IPC9592 for reliability requirements. Electrical performance starts with an efficiency rating of 96 per cent with 600W output power at 55 degrees C with no heatsink, output pre-bias protection under all conditions, tight line and load regulation, low output ripple and noise and fast load transient response, in an industry standard DOSA quarter brick format.
All variants include a baseplate for thermal performance that also provides a surface for mounting an additional heatsink for extreme temperature applications. Safety certifications include UL/EN/IEC 60950-1 and CAN/CSA-C22.2 No 60950-1 2nd edition and the converters are compliant with EN55022/CISPR22 EMC standards with minimal input filtering.
