ST SPC584B-DISP, Руководство пользователя

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4 Hardware overview
4.1 Power supply section
The input voltage level is 12 V
DC
, the output voltage is set to 5 V and 3.3 V.
The Figure 2 and Figure 3 show the buck converters used to generate 5 V and 3.3 V respectively.
Figure 2. 12 V - 5 V buck converter
C82
10uF/50V
C83
100nF/50V
C84
22nF/50V
C87
220pF/50V
R75
4,7kΩ
GND
TP21
3V3
R73
10kΩ
R74
3,3kΩ
C86
100nF/50V
V_Ext
5V TP20
5V
VCC
8
COMP
4
V
R
ef
6
G
N
D
7
IN
H
3
OUT
1
SYNC
2
FB
5
U8
A5973AD
SB25
Closed
L3
33uH/1,5A
D2
STPS340U
C85
330uF/10V
Figure 3. 3.3 V buck converter
VCC
8
COMP
4
V
R
ef
6
G
N
D
7
IN
H
3
OUT
1
SYNC
2
FB
5
U7
A5973AD
C76
10uF/50V
C77
100nF/50V
C78
22nF/50V
C81
220pF/50V
R72
4,7kΩ
TP19
3V3
D1
STPS340U
R70
5,6kΩ
R71
3,3kΩ
C80
100nF/50V
V_Ext
3V3 TP18
3V3
SB24
Closed
GND
L2
15uH/2A
C79
330uF/10V
The Figure 4 shows a 3.3 V linear regulator; it is suitable to supply the ADC section.
Figure 4. 3.3 V linear converter
G
N
D
1
Vout
4
Vin
3
U9
LD1117A3V3
5V
L4
60ohm-500mA
C88
100nF/50V
C90
4,7uF/16V
C89
100nF/50V
C91
100nF/50V
C92
4,7uF/16V
GND
3V3_LR
TP22
3V3_LR
UM2462
Hardware overview
UM2462 - Rev 3
page 5/25