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Page 7
Power Shed Mode
Introduction to the MicroPAC Power Shed Mode
The aim of the power shed mode is to increase the overall light load efficiency 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 efficiency 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.
Power Shed Mode Prerequisites
n
Slots 1 to 4 must be populated
n
All outputs must be the same voltage
n
All slots must be configured in a parallel array
n
Current rate slew rate not to exceed 20.8 A/s
n
The PSM is not suitable for constant dynamic loads
Configuring Power Shed Mode
The Power Shed Mode is factory configured.
Power Shedding Bands
There are four operational modes for the power shedding scheme.
1
0.0 – 250 W
Output 1, active
2
250 – 500 W
Output 1 and 2, active
3
500 – 750 W
Output1, 2 and 3 active
4
750 – 1200 W / 1300 W
Output 1, 2, 3 and 4 active
Table 2.
Connector Kit
(19-130066)
Material List
Category
Customer Load
Output
