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Technical Reference Manual
TMDXEVM6657L
SPRUHG7 - Revised August 2012
TMDXEVM6657LE
Page 56 / 90
4.2 Power Supply Distribution
A high-level block diagram of the power supplies is shown in Figure 4.1. It is also shown in the schematic.
In Figure 4.1, the Auxiliary power rails are always on after payload power is supplied. These regulators support
all control, sequencing, and boot logic. The Auxiliary Power rails contain:
•
VCC3V3_AUX
•
VCC1V8_AUX
•
VCC1V2
•
VCC5
The maximum allowable power is 22.5W from the external AC brick supply or from the 8 AMC header pins.
Figure 4.2: C6657 Lite EVM Power Generation Topology
Individual control for each (remaining) voltage regulator is provided to allow flexibility in how the power planes are
sequenced (Refer to section 4.3 for specific details). The goal of all power supply designs is to support the
ambient temperature range of 0°C to 45°C.
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