VICOR MicroPAC Specifications download pdf (Page 8)

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MicroPAC Power Shed Mode

1.1.1 Introduction to the MicroPAC Power Shed Mode

The aim of the power shed mode is to increase the overall light load eciency of the MicroPAC.

This is achieved by minimizing the power dissipation when light load or no load conditions

are present on the MicroPAC output.

The original concept of improving light load eciency for VI Chip Bus Converter arrays was

developed by Mr. Ankur Patel (Vicor Product Line Engineer).

The following is an alternative method of power shedding

incorporated within the MicroPAC.

1.1.2 Power Shed Mode Prerequisites

> Slots 1 to 4 must be populated

> All outputs must be the same voltage

> All slots must be conﬁgured in a parallel array

> Current rate slew rate not to exceed 20.8 A/s

> The PSM is not suitable for constant dynamic loads

1.1.3 Conﬁguring Power Shed Mode

The Power Shed Mode is factory conﬁgured.

1.1.4 Power Shedding Bands

There are four operational modes for the power shedding scheme.

Category Customer Load Output

0.0 – 250 W

Output 1, active

2 250 – 500 W Output 1 and 2, active

500 – 750 W Output1, 2 and 3 active

750 – 1200 W/1300 W Output 1, 2, 3 and 4 active

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 20 21

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VICOR MicroPAC Specifications Page 8