MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 26

• 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 / dsPIC33F 3-Phase Energy Meter Reference Design
FIGURE 2-7:
DS51723A-page 26
J1
2
1
L301
INDUCTOR
L302
INDUCTOR
An LDO is connected in series at the output of the switching power supply to obtain a
more stable power supply. Figure 2-7 shows this circuit. Microchip's MCP1701 device
and MCP1700 device, low drop-out high efficiency LDOs, are selected for use.
D301 is the power LED for the meter and is active when the meter is connected to the
proper line input voltage.
5V and 3.3V LDO Modules.
R316
470
5V_IN
D301
LED
+ C337
100uf
C322
CAP
C323
CAP
2
3
MCP1701(5V-SOT89)
U306
MCP1700(3.3V-SOT23)
Vin
Vin
Vout
Vout
© 2009 Microchip Technology Inc.
3
2
C336
0.1uF
C324
CAP
+ C339
47uF
+ C338
100uf
3.3V
5V