Overview
Data centers and telecom installations are under constant pressure to deliver more power in less space, with lower loss. As server and networking power rises, a 12 V distribution bus becomes impractical because the current, and therefore the distribution loss and the copper cross-section, grow too large. The industry is moving to a 48 V distribution bus, where the same power travels at one quarter of the current, and to a hierarchical architecture in which an isolated intermediate bus feeds non-isolated point-of-load regulators. Vicor power modules are built for exactly this architecture, and BeiLuo supplies them with genuine traceability and FAE support.
The Intermediate Bus Architecture
In a 48 V architecture, a high-voltage DC feed, often around 380 V, is stepped down to an isolated 48 V intermediate bus by a fixed-ratio bus converter. The BCM is a Sine Amplitude Converter that runs at high frequency with a low series impedance, so it delivers low noise, fast transient response and about 98 percent efficiency. Because the ratio is fixed, the secondary tracks the primary, and the module behaves as an efficient capacitance multiplier that lets the bulk capacitance on the 48 V bus be scaled down substantially, freeing board space at the point of load.
BCM Bus Converters
The BCM6123TD1E5126T00 steps a 260 to 410 V primary down to an isolated 47.5 V secondary with a 1/8 ratio, and the BCM6123T60E15A3T00 provides a 1/4 ratio from a 36 to 60 V primary to a 9 to 15 V secondary at up to 130 A. Both offer 4242 VDC isolation and full protection, with an optional PMBus interface for control and telemetry.
Regulated Rails at the Point of Load
Below the intermediate bus, point-of-load regulators produce the low voltages the silicon needs. Where a rail must be isolated and tightly regulated, a Vicor DCM module converts a wide, unregulated input into a tight isolated output. The DCM3623T50M31C2T00 delivers 320 W at 28 V from a 16 to 50 V input, and the DCM3623T50T13A6T00 delivers 160 W at 12 V from a 9 to 50 V input, so a single module can replace a pre-regulator and hold the load voltage steady through brownouts. For narrower, well-regulated rails, the Maxi, Mini and Micro brick converters, such as the V48C12C150BL2, provide a proven, low-noise 12 V rail in the industry-standard footprint.
Density and Thermal Design
The ChiP package used by the DCM and BCM families offers low top-side and bottom-side thermal impedance, so heat can be removed through the top with a heat sink or through the baseplate into the board. In a dense rack this flexibility matters, because the thermal path often sets the power limit. The high switching frequency also enables low-profile, high-density filtering, which further reduces the board area the power stage needs.
Efficiency and Total Cost
A hierarchical architecture with high-efficiency modules reduces the loss at every conversion stage, which lowers the electricity cost and the cooling load over the life of the installation. Higher density also means more compute or more ports per rack, which improves the economics of the facility. Those are the reasons the 48 V architecture has become the default for new data center designs.
Design Support and Supply
BeiLuo keeps mainstream Vicor bus converters, DCM modules and brick converters in regional stock, ships them with import declaration, certificate of origin and RoHS documents, and supports architecture partition, thermal design and EMI filtering with an in-house FAE team. From a single server board to a full rack distribution, our engineers help you choose the modules and size the bus so the power stage is efficient, dense and reliable.