Digital power debuts for 48V-dc servers
By Margery Conner, Technical Editor -- EDN, July 2, 2008
Power supplies that rely on analog-control loops may be highly efficient at full load but become less so when the load drops below its tuned “sweet spot.” As a result, server farms for the telecom and datacom industries are seeking a digital approach as they grapple with high energy costs because digitally controlled power supplies’ savings in energy and maintenance costs quickly outweigh their relatively higher initial costs. Among the first using a digital-control approach, Ericsson has introduced the BMR453 series of dc/dc-converters. Available in quarter-brick, 2.28×1.45-in. modules, they offer as much as 400W output power or 33A with ±2% accuracy and 96% efficiency. The devices rely on a Texas Instruments UCD 91XX digital-power controller.
With an input range of 36 to 75V dc and an output range of 9 to 12V, the BMR453 series target systems that use −48 and −60V nominal input voltages or any system that must use a telecom input voltage with battery backup. The device’s wide load regulation also allow its use as an IBC (intermediate-bus controller) in systems with an IBC-powered hard drive that requires a tightly regulated bus voltage.
The BMR453 is available with a PMBus interface for system communication, control, and monitoring or can be hardware-programmed. The BMR453 with a communication interface sells for $55.50 (OEM quantities).
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this part can use to diagram or part of supply power of inverter, can't it?
arfan karim - 2009-1-2 06:01:00 PST
