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Power
Some TI audio EVMs require a regulated V DD supply (3.3 V or 5 V typical) for
operation. This can be provided by a power supply/voltage regulator EVM
installed in platform socket U6 (runs off of the platform V CC bus) or by an
external regulated supply. If an external V DD source is used, depending on the
EVM requirements, V DD should be:
3.3 V or 5 V, and must not exceed 6 V
3.3.3.2
3.3.3.3
3.3.3.4
On-Board 9-V Battery
Many low-power portable and battery-powered audio systems can be
modeled on the platform with TI audio EVMs. It may make sense, then, to
power these system models on the platform using an on-board battery. The
platform is equipped with a snap-in battery holder for a common 9-V battery
and jumper JP3 connects the battery to the V CC bus, which routes the battery
voltage to the various EVM sockets.
Since the V CC bus also supplies the on-board power supply/voltage regulator
socket, the battery voltage can be input voltage for a power supply/regulator
EVM plugged into U6. The regulator EVM then supplies regulated voltage to
the V DD line for use by those EVMs that require regulated V DD power.
For high-power audio system evaluation and demonstration, one of the other
platform power supply options should be selected.
Unregulated External DC at Screw Terminals J1
Unregulated DC voltage from a bench-type supply or any other source of DC
power within the required voltage range can be connected to screw terminals
J1 for V CC power. Jumper JP1 connects J1 to the V CC bus for distribution.
Voltage applied to screw terminals J1 MUST be of the correct polarity and
MUST NOT exceed 15 V or the power protection circuit on the V CC bus will trip.
Unregulated External AC or DC at Coaxial Power Connector J2
The coaxial power jack, J2, matches a large number of the typical wall-cube-
type power transformers/power supplies. Although the jack is of a standard
size (5.5 mm O.D. × 2.1 mm I.D.), there does not seem to be any standard for
voltage polarity or power type (AC or DC) among wall-cubes and other power
sources using a coaxial power plug. To ensure the widest possibility
compatibility, the platform is equipped with a full-wave bridge rectifier between
the coaxial connector and the V CC bus to allow DC voltage of either polarity,
or AC voltage to be input through J2. Jumper JP2 connects J2 to the V CC bus
for distribution.
The bridge rectifier eliminates the need to determine the plug polarity for input
voltage at J2 and rectifies AC voltage applied to J2 into DC before it is
connected to the V CC bus. An on-board filter capacitor on the bus smooths the
rectified AC.
With DC voltage applied to J2, the bridge rectifier introduces a voltage drop
of approximately 1.4 V (two diode forward-drops). This drop must be taken into
account if the DC voltage applied to J2 is at or near the minimum required for
operating a module installed on the platform, and the external voltage supply
adjusted accordingly.
Details
3-9
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