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Power
With an AC voltage applied to J2, V CC bus voltage depends on several factors,
including the load on the bus. As a general rule for typical AC voltage inputs,
however, V CC bus voltage will be approximately the peak value of the applied
AC voltage.
The bridge rectifier also causes the platform ground bus to be approximately
0.7 V above the ground of other equipment that might be operated by the same
external power supply. Platform V CC and EVM voltage measurements should
be referenced to the platform ground bus (test point TP1, for example) and not
the external power supply ground when V CC voltage is supplied from J2.
V CC voltage MUST NOT exceed 15 V or the overvoltage protection circuit on
the V CC bus will trip.
3.3.3.5
3.3.3.6
3-10
Regulated DC From On-Board Regulator (Socket U6)
A power supply/voltage regulator EVM can be installed in platform socket U6
to provide a a regulated V DD voltage (3.3 V or 5 V typical) for audio evaluation
modules installed on the platform that require it. The regulator EVM uses
power from the V CC bus as an input and provides the appropriate regulated
voltage to the platform V DD line.
V DD voltage also appears at screw terminals J6, where it can be used as a
source of regulated power for off-board use, subject to the maximum current
capabilities of the regulator module installed in U6 and the platform V CC
supply.
Do not allow the V CC voltage to exceed the maximum specified for the installed
power supply/voltage regulator EVM.
Regulated External DC at Screw Terminals J6
Regulated voltage (3.3 V or 5 V typical — 6 V maximum) from an external
source can be connected to screw terminals J6 to supply the platform V DD line
for audio evaluation modules installed on the platform that require a regulated
V DD supply.
Voltage applied to screw terminals J6 MUST be of the correct polarity and
MUST NOT exceed 6.1 V or the power protection circuit on the V DD line will
trip.
Details
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