MCP39F501 Power Monitor Demonstration Board User’s Guide
DS50002240A-page 18
2014 Microchip Technology Inc.
3.2
POWER SUPPLY CIRCUIT
The power supply circuit for the MCP39F501 Power Monitor Demonstration Board
uses a half-wave rectified signal and a +3.3V voltage regulator.
FIGURE 3-4:
Low-Cost Power Supply Circuit.
150 FB
33
1.5 µF
470 µF
1
3
2
N
L
0.1 µF
+3.3 VD
+
10 µF
IN
OUT
GND
MCP1754
0.1 µF
A
GND
GNDB
GNDB
GNDB
GNDB
GNDB
GNDB GNDB
NT
‘
0.1 µF
10 µF
A
GND
A
GND
+3.3 VA
100
+9V DC Power In
(DO NOT USE WHILE
METER IS CONNECTED
TO MAINS!)
