101-1017 Rabbit Semiconductor, 101-1017 Datasheet - Page 213

• Manufacturer Part Number: 101-1017
• Description: KIT DEV POWERCORE 3800 INT'L
• Manufacturer: Rabbit Semiconductor
• Series: PowerCore FLEXr
• Type: MPU Moduler

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

Since at any given time there is only current flowing in one of the diodes, there is only one
diode voltage drop at a given time in the circuit. Because current flows during both half-
cycles, only half the current required by an equivalent half-wave rectifier will be needed.
The power dissipated by the full-wave center-tapped rectifier is 0.7 V × current. Since this
rectifier circuit has only two diodes, it is less expensive than a full-wave bridge. Since the
power-supply center tap is ground, there is a common ground between the power supply
and the circuit. However, each of the secondary windings of the transformer must still pass
the full current, and this along with the third center-tap connection could increase the
physical size and cost of the transformer.
Because there is a common AC ground between the AC power transformer and the circuit,
AC zero-crossing detection is possible. Zero-crossing detection allows accurate triac tim-
ing control. Thus, the zero-crossing detection circuit is stuffed and triac control is sup-
ported with this option.
User’s Manual
After the rectifier, 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.
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