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B-40 SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
B.22 DDC
The DC-DC converter (DDC_A) supplies DC power to electronic components mounted on
the backplane (BP_A) for M8000. The DDC_A receives 48 VDC and 12 VL and outputs 1.0
VDC, 1.8 VDC, and 3.3 VL.
The DDC_A is shown in
FIGURE B-34.
FIGURE B-34 DC-DC Converter (DDC_A)
The DDC_A has the following characteristics.
■ Because DDC_As are normally operating in redundancy, active replacement or hot
replacement of a failed DDC_A during system operation is possible.
■ The current balancing function enables concurrent redundant operations.
■ The DDC_A has a label bearing the printed component number and manufacture's serial
number