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Power Supplies
13
SPRUI64C – May 2017 – Revised April 2018
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AM572x Industrial Development Kit (IDK) Evaluation Module (EVM)
Hardware
3
Power Supplies
This section describes how the power supplies required for the design are generated.
3.1
Power Source
The AM572x IDK EVM uses an external 5V power supply. The 5V power input is converted into different
voltage levels to provide power inputs to the AM572x processor and other circuitry.
Early versions of the AM572x IDK EVM shipped with the GlobTek, Inc. external power supply with the part
number TR9CA6500LCP-N, model number GT-43008-3306-1.0-T3. This external power supply is rated for
an output voltage of +5VDC with an output current up to 6.5A. This external power supply contains
applicable regional product regulatory/safety certification requirements for most worldwide locations. If you
cannot use this supply, one with equivalent ratings that is approved for your location must be obtained.
The AM572x IDK EVM contains a right angle mounted power connector that accepts the +5VDC supply
input on the center pin with the outer shell as the common return. The power connector accepts a mating
plug with a 2.5mm ID and a 5.5mm OD.
Removing the power plug and inserting it again while the power supply is energized may damage the
AM572x IDK EVM and/or other devices attached to the board such as emulators that provide an alternate
path to ground. Removal of AC power from the external power supply is a safer method, if required.
It is recommended that the external power supply have the common return bonded to earth ground. If this
is not possible, a separate connection from the board ground to earth ground may need to be provided.
3.2
TPS6590377 PMIC
The power requirements of the processor are met by the TPS6590377 Power Management IC (PMIC).
The power sequencing requirements of the AM572x processor are also handled by the TPS6590377
PMIC.
Figure 6
shows the supply connections from the TPS6590377 PMIC to the AM572x processor.
Refer to the
AM572x Sitara Processors Silicon Revision 2.0 Data Manual (SPRS982)
for more information
about the required supply voltages and supply sequencing. Also refer to the
TPS659037 Power
Management Unit (PMU) for Processor Data Manual (SLIS165)
and the
TPS659037 User's Guide to
Power AM572x and AM571x User’s Guide (SLIU011)
for details about its operation.
Note that the production version of the AM572x IDK EVM uses the TPS6590377 PMIC that supplies the
voltages needed for the latest silicon version of the AM5728 processor. Beta prototype IDK EVM units
used the TPS6590375 PMIC and Alpha prototype IDK EVM units used the TPS6590372 PMIC.
3.3
AVS Control
The AM572x processor consumes most of its power in its core logic. Therefore, minimizing the voltage
supplied to this core logic can minimize power consumption. SmartReflex™ technology is used to provide
this optimized solution.
This core logic is separated into multiple segments that can each be controlled separately. In this way,
applications that need more performance in some processing blocks can operate at higher performance
levels by increasing the supply voltage, while other processing blocks that do not require the same level of
performance can operate at lower voltage thus further optimizing system power consumption.
The TPS6590377 PMIC is connected to the I2C1 on the AM5728 processor. This allows the application
software to individually control the AVS supply outputs. It also allows the application to control the voltage
generated by LDO1 that is used for the SDIO interface that operates at either 1.8V or 3.3V depending on
the operating mode.
3.4
Other Power Supplies
The AM572x IDK EVM contains 8 other power conversion devices that support the interface and memory
circuitry:
•
TPS63010 Buck-Boost Converter: This converter generates 5.0V from the main supply input. It
supplies this voltage to the industrial interface circuits, the HDMI interface and to the USB master
ports.
