Half-brick DC-DC converters

4 February 2009 Power Electronics / Power Management

Murata Power Solutions has added two new ranges of single-output, half-brick, isolated DC-DC converters to its product portfolio. The HPH series is a family of high-output converters with different models capable of delivering up to 360 W of power and 70 A output current. The UCH series comprises modules that deliver between 50 W and 150 W of output power and a maximum output current of 40 A.

Both the HPH and UCH series are isolated to 2250 V d.c. with an open-frame construction and are designed for PCB mounting. Both series are in compliance with RoHS legislation and have UL60950-1 and EN60950-1 safety approvals.

HPH series converters offer a choice of fully regulated single outputs ranging from 3,3 V to 12 V d.c. A wide input voltage range of 36 V to 75 V d.c., combined with an industry standard pinout and package measuring 61 x 58,4 x 10,2 mm, simplifies the use of the modules in low-voltage/high-current OEM applications. The converters utilise a full-bridge, fixed-frequency topology along with synchronous output rectification that enables levels of efficiency up to 91% to be achieved.

The UCH series is offered with outputs from 2,5 V to 15 V d.c. and a choice of either 36 V to 75 V d.c. or 18 V to 36 V d.c. input voltages. Module footprint and installed height are identical to the HPH series. UCH series converters are suitable for demanding telecom, datacom and networking applications with their semi-synchronous rectifier design helping them achieve efficiency levels up to 92%.

The standard operating temperature range of both product families is -40°C to +85°C, while thermal performance can be improved by using an optional base plate.

Remote sense, output trim and primary side on/off control with either positive or negative logic are included in the design of both new product series. The converters provide short circuit protection and thermal shutdown, plus input under-voltage and input/output over-voltage protection.

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