Devices’ Features and Data Paths | Power Supply Module |
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Power Supply Module
The blade is fed via two redundant −48V inputs. Both are converted via a DC/DC converter to an intermediate voltage of +12V. This voltage, in turn, is converted via further DC/DC converters to on−board voltages which are used by the on−board devices. A −48V/+3.3V DC/DC converter converts the −48V input voltage to +3.3V which is used to feed the IPMC and power−up logic.
The blade′s power up and power down cycles are under full control of the IPMC. It controls both the −48V/+12V DC/DC converter as well as power−up logic which controls the remaining on−board DC/DC converters. If the IPMC detects a failure on any of the local on−board voltages, it shuts off the entire blade power.aaa
The blade′s power supply structure is shown in the following figure.a
−48V_A
−48V_B
Return_A
Return_B
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| DC | +5V | ||
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| DC |
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| +3.3V | |||
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| +12V |
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| DC/DC |
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| DC | +2.5V | ||||
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Status |
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| Control |
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| Enable |
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| ... CPU Core | ||||||||
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| DC | Voltage | ||
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| IPMC |
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| Power−Up |
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| Logic |
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−48V_A
−48V_B
Return_A
Return_B
DC +3.3V DC
Power Good
Figure 39: Blade Power Supply Structure
126 | PENT/ATCA−717 |
