101-1017 Rabbit Semiconductor, 101-1017 Datasheet - Page 209
101-1017
Manufacturer Part Number
101-1017
Description
KIT DEV POWERCORE 3800 INT'L
Manufacturer
Rabbit Semiconductor
Series
PowerCore FLEXr
Type
MPU Moduler
Datasheet
1.101-1007.pdf
(240 pages)
Specifications of 101-1017
Contents
RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
Processor To Be Evaluated
PowerCore 38xx
Interface Type
Ethernet
For Use With/related Products
RCM3800
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Thus, as an example, if the user's 5 V circuitry consumes 2.5 W and the user's 3.45 V cir-
cuitry consumes 0.5 W, the total power needed from the power supply is (2.5 W × 1.33 +
0.5 W × 1.92 + (PowerCore consumption as optionally configured)) = 5.3 W to 7.0 W. If
the external power supply is a 12 V supply, then it will need to source I = Power/Voltage
current. Bear in mind that voltage presented to the regulators has a 1.4 V diode drop. Thus
the voltage in this formula must be reduced by 1.4 V, so current = Power/10.6 V = 5.3 W/
10.6 V = 500 mA; 7.0 W/10.6 V = 660 mA. This is the DC power supply current require-
ment, and would be the maximum current that an AC power-supply would have to deliver.
The input power circuit configuration is shown below for Option 3.
The full-wave bridge rectifier has no common ground between the power-supply trans-
former and the rest of the circuit. The full-wave bridge requires four diodes and therefore is
a more expensive circuit than a full-wave center-tapped rectifier or a half wave rectifier.
User’s Manual
The output from this full-
wave bridge is shown at
right.
After the bridge, the AC
voltage is filtered with a
large (1000 µF) capacitor.
The final filtered voltage is
shown by the solid line in the
diagram at right.
201
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