Datasheet

page 6
v7
Power supply
Board contains switching power
supply that creates stable voltage
and current levels necessary
for powering each part of
the board. Power supply
section contains specialized
MC33269DT3.3 power regu-
lator which creates VCC-3.3V power
supply, thus making the board capable of
supporting 3.3V microcontrollers. Power supply
unit can be powered in three dierent ways: with USB
power supply (CN20), using external adapters via adapter
connector (CN30) or additional screw terminals (CN31). External
adapter voltage levels must be in range of 9-15V DC and 7-12V AC.
Use jumper J9 to specify which power source you are using. Upon providing
the power using either external adapters or USB power source you can turn on power
supply by using SWITCH 1 (Figure 3-1). Power LED ON (Green) indicates the presence of
power supply.
Figure 3-2: Power supply unit schematic
Figure 3-1: Power supply unit of EasyPIC Fusion
™
v7
E17 220uF/35V/LESR
R74
100K
C39
1uF
L1 10uH
R76
20K
VCC-5V
J9
2
1 3
SWITCH1
VCC-USB
-
D3
1N4007
D4
1N4007
D5
1N4007
D6
1N4007
CN30
CN31
R69
10K
1
2
3
54
6
7
8
GND
FB
INH
VINA PGND
SW
VINSW
SYNC
E
U8 ST1S10
C40
22uF
C42
22uF
C45
22uF
R84
4K7
VCC-5V
POWER
R68
2K2
LD78
2
C38
100nF
VCC-5V
1
3
GND
Vout
Vin
REG1
MC33269DT3.3
E16
10uF
3.3V VOLTAGE REGULATOR
VCC-3.3V
C37
100nF
E15
10uF
VCC-USB
FP1
C5
100nF
1
2
3
4
VCC
GND
CN20
USB
power supply