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AN908 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN908
Description  APPLICATION NOTE
PDF  9 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN908 Datasheet(HTML) 8 Page - STMicroelectronics

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background image
R5
27K
C11
R2
10K
C10
680pF
C9
220nF
C8
1
∝F
C13
47
∝F
R13
4.7
R1
6.8K
R8 4.7
VO=3.3V
IOmax=12.5A
C5-7
220
∝F-10V
SANYO-OSCON
C1-4
220
∝F-10V
SANYO-OSCON
VI 5V
±5%
VCC 12V
R9
820
R10
2.4K
D1
STPS10L2S
D99IN1068A
Q1
STP60N03L
DC
OUT
4
1
2
712
VREF
SYNC
VCC
VC
RCT
SS
SGND
ISEN
COMP
VFB
PGND
L1 2
∝H
3
10
6
5
11
8
9
13
DC LIM
15
DIS
14
APPLICATION IDEAS
Figure 11. Voltage Mode Regulator.
L2 50T
L3
L1 2.6
µH
L4990A
IC1
8
1
12
11
5
6
7
4
VREF
C10
680pF
C21
220nF
+
-
+
-
-
+
+
-
C11 150pF
C12
220pF
Q2 BC337
R5 27K
R21a 3K
R14
R22 3K
R9
1K
R8 4.7
R6 510
R20
R4 4.7K
C20
220nF
R1
6.8K
R10
10K
R16
10K
R18
6.2K
R20
6.2K
EN
D0
D1
D2
D3
D99IN1069
R21
10K
R23
R24
R25
R26
R19
1.5K
D4
D5
D2
D1
STPS202S
R3
10K
C5-8 330
µF-5.3V
SANYO OSCON
V
O=2V-3.5V
I
O=0.3A-12.5V
Q3
BC327
Q1 STP80N03
C1-4 330
µF-25V
LXF-NCC
D3
LM339/A
IC2
C16
1
µF
R17
6.2K
C17
PWRG
B
D
C
A
R10a
10K
R11
2K
R12
22K
V
CC
V
i 5V±5%
C19
1
µF
C13
47
µF
2
RCT
SGND
PGND
VFB
COMP
ISEN
OUT
SS
SYNC
VCC
DIS
DC-LIM
VC
9
14
15
R7
3.3
Figure 12. Simplified Schematic.
AN908 APPLICATION NOTE
8/9



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