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Power
If a reverse-polarity voltage is input, the zener, being forward biased, conducts
immediately, and again the fuse opens. A similar circuit protects the V DD line.
Note that the V CC bus protection components are ahead of the platform power
switch. And since there is no power switch for the V DD line, both protection
circuits will respond to reverse power polarity and overvoltage conditions at
the moment they are applied to the platform power input connectors. Power
polarity and voltage levels must be set and verified before external power is
applied to the platform.
Correct polarity and maximum voltage levels should always be strictly
observed because not only is the operation of the crowbar circuit always
destructive to some degree (at a minimum, the opened fuse must be
unsoldered and replaced), there is always the chance for damage to the
platform, the installed modules, and/or the external power source before the
fuse opens.
Damage to the protection circuit and/or the platform (beyond an open fuse)
can occur if the external power supply is unable to provide at least 3 amps of
current to ensure the fuse opens quickly. Lower currents can cause failure of
the zener diode and possibly damage to the platform PCB traces from
overheating.
3.3.3
3.3.3.1
3-8
Platform Power Inputs
The evaluation modules installed on the platform can be powered by a wide
variety of V CC sources including:
On-board 9-V battery
Unregulated external DC at screw terminals J1
Unregulated external AC or DC at coaxial power connector J2
And for those TI audio EVMs that require a regulated V DD supply:
Regulated DC from on-board power supply/regulator (socket U6)
Regulated external DC at screw terminals J6
Selecting the appropriate power source may depend on the requirements of
the various modules in the audio system assembled on the platform, or simply
on what is available (as long as platform and EVM requirements are met).
Power Requirements
Platform V CC voltage limits are governed by the lowest level that will operate
all of the installed modules and the highest level that the modules (or the
platform overvoltage protection circuit) will tolerate. In general, however, the
V CC input voltage should be in the range of:
Approximately 3.3 V to a maximum of 15 V
Approximately 5.5 V to a maximum of 12 V if a SLVP097 power
supply/voltage regulator module is installed in U6
Details
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