Microchip Technology ARD00330 データシート
Energy Monitoring PICtail™ Plus Daughter Board User’s Guide
DS51933A-page 16
© 2011 Microchip Technology Inc.
2.3
POWER SUPPLY CIRCUIT
The power supply circuit for the Energy Monitoring PICtail Plus Daughter Board uses
a half-wave rectified signal, a single +5V voltage regulator and a 3.3V LDO.
a half-wave rectified signal, a single +5V voltage regulator and a 3.3V LDO.
FIGURE 2-4:
Simplified Power Supply Circuit.
150 FB
33
Ω, 5W
1.5 µF
470 µF
B
B
B
B
A
1
3
2
+9V DC Power In
(DO NOT USE WHILE
METER IS CONNECTED
TO MAINS!)
L
N
100 nF
B
10 µF
B
+5V
B
In
Out
GND
100 nF
B
+3.3V
B
+5V
100 nF
MCP1700
10 µF
B
+
In
Out
GND
MCP1702
200 mA
B