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VCC-5V
POWER
R56
2K2
LD1
SWC
SWE
CT
GND
DRVC
IPK
VIN
CMPR
U1
MC34063A
R12
0.22
R10
3K
C21
220pF
D6
MBRS140T3
L2
220uH
E1
330uF/35V
VCC-EXT
R11
1K
VCC-5V
+
-
D1
1N4007
D4
1N4007
D3
1N4007
D5
1N4007
CN4
CN2
E2
330uF/6V
5V SWITCHING POWER SUPPLY
VCC-5V
1
2
3
5
4
VREF-1.8V
C22
2.2uF
VCC-3.3V
E6
10uF
IN
GND
OUT
EN
ADJ
U5
AP7331-ADJ
R15
120K
R13
22K
R14
12K1
1
3
2
C2
100nF
VCC-5V
GND
Vout
Vin
REG1
MC33269DT3.3
E5
10uF
VCC-3.3V
E4
10uF
C1
100nF
C19
100nF
VCC-3.3V
AVCC
FP2
FERRITE
C18
100nF
1
2
3
4
VCC
GND
CN3
USB B
VCC-USB
VCC-5V
D2
MBRS140T3
FP1
FERRITE
C10
100nF
1.8V VOLTAGE REGULATOR
3.3V VOLTAGE REGULATOR
Figure 1-4: Power supply schematics