MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 18

• Manufacturer Part Number: MCP3909RD-3PH3
• Description: REF DESIGN FOR MCP3909 W/18F2520
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH3

• Main Purpose: Power Management, Energy/Power Meter
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP3909 3-Phase Energy Meter Reference Design
2.4
FIGURE 2-4:
any single phase with 70% nominal voltage.
DS51643B-page 14
N
PHA
PHB PHC
POWER SUPPLY CIRCUIT
150 FB (Note)
150 FB (Note)
150 FB (Note)
The power supply circuit for the MCP3909 3-Phase Energy Meter Reference Design
uses three voltage transformers to step down the 220V line voltages to the 5 volt
regulator. The 2W maximum current consumption specification of the IEC62053 and
legacy IEC61036 specifications limit the power supply voltage to a input voltage low
enough to keep the power below this level.
Power Supply Circuit. IEC62053 states that the meter must be able to operate from
10nF
10nF
10nF
Note: FB = ferrite beads. Ferrite beads have an impedance of the
specified value at 100 MHz.
470 µF
600
100 nF
© 2008 Microchip Technology Inc.
LM1117-5.0
+5V
100 nF