Quarter-brick intermediate bus converter family can deliver 600 W

10 March 2004 Power Electronics / Power Management

The first members of Vicor's family of 48 Vin intermediate bus converter modules (IBCs), are offered in standard ¼-brick format and operate from a 38-55 V d.c. input. The IBC family consists of nine fixed-ratio standard models with nominal outputs from 3 to 48 V d.c. (3, 4, 6, 8, 9,6, 12, 16, 24 and 48 V) delivering up to 100 A or 600 W.

IBCs incorporate V•I Chip Bus Converters (BCMs) into the ¼-brick standard and is known as 'VICs-in-a-Brick'. This doubles the power capability of older technology IBCs for Intermediate Bus Architecture applications. Specifically, these pin-compatible, industry-standard quarter bricks deploy either a single BCM, rated up to 300 W, or two parallel BCMs, capable of 600 W. Output current is limited by the pins of the 1¼-brick to 50 or 100 A, depending on the pin-out configuration.

Efficiency of the IBCs ranges from 95% at 3 V to better than 97% at 48 V, according to Vicor. Full power is available with only 200 LFM, 55°C air without a heatsink. The BCMs have superior speed and transient performance, responding to 100% step load changes in less than 1 ms.

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