SI9137 Vishay, SI9137 Datasheet - Page 11

• Manufacturer Part Number: SI9137
• Description: Multi-output, Sequence Selectable Power-supply Controller For Mobile Applications
• Manufacturer: Vishay

Document Number: 70874
S-40808—Rev. C, 26-Apr-04
DETAILED FUNCTIONAL BLOCK DIAGRAMS
SLC
COMP
REF
V
CSN
CSP
REF
Soft-Start
−
+
20 mV
V
Error
Amplifier
t
−
+
−
+
FIGURE 6. Buck-Boost Block Diagram (5- to 12-V Adjustable Controller)
Error
Amplifier
C/S
Amplifier
Soft-Start
100 mV
−
+
PWMCMP
Pulse
Skipping
Control
Current
Limit
SYNC
Rectifier Control
FIGURE 5. Buck Block Diagram (3.3-V and 5-Controllers)
t
−
+
−
+
PWM
Comparator
Pulse
Skipping
Control
Current Limit
SEQ
Control
Logic
RUN/STOP
SEQ
Control
Logic
RUN/STOP
1X
_
+
BBM
DH
DL
LX_
V
BST_
L
DH
DL
BSTFY
LXFY
CS_
FB_
DH
DL
FB
5
Vishay Siliconix
R
R
FBFY
X
Y
DHFY
DLFY
R
R
Internal voltage divider is
only used on 5-V output.
2
3
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Si9137
11