Isolated 48 V, 300 W converter for Power-over Ethernet and VoIP

2 June 2004 Power Electronics / Power Management

Vicor's newest member of its V•I Chip bus converter module (BCM) family, the B048K480T30, is rated for 300 W and with an efficiency of 97%. It provides 2250 V d.c. primary-to-secondary isolation with a unity transformation ratio (K = 1) over the input range of 38-55 V d.c. It is suited for Power-over-Ethernet and VoIP applications and other applications requiring isolation from a 48 V d.c. source.

The company says that this V•I Chip sets a new record for power density at 71 W/cm³. It can be surface-mounted into the PCB with a profile as low as 4 mm, for an effective power density of 107 W/cm³, or on the board with an overall height of 6 mm, for a power density of 67 W/cm³. The V•I Chip power package is available with BGA or J-leads and is fully compatible with standard surface mount manufacturing processes. With its high efficiency and thermally adept package, the full 300 W rating is realised at 65°C, 300 LFM, without a heatsink. With a 6 mm-high integral pin fin heatsink, full load is available at 75°C, 200 LFM.

Its extremely fast response time and very low noise greatly reduces - or even eliminates - the need for bulk capacitance and other filtering components, says the manufacturer, resulting in additional savings in board area, materials, and total system cost.

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