SI9137LG Vishay, SI9137LG Datasheet - Page 11

• Manufacturer Part Number: SI9137LG
• Description: IC, PWM AND PSM CONVERTER CTRL, SSOP-28
• Manufacturer: Vishay

Specifications of SI9137LG

• Primary Input Voltage: 15V
• No. Of Outputs: 5
• Output Voltage: 12V
• Output Current: 1A
• No. Of Pins: 28
• Operating Temperature Range: 0°C To +90°C
• Power Dissipation Pd: 762mW
• Termination Type: SMD
• Duty Cycle (max): 95 %
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Switching Frequency: 330 KHz
• Maximum Operating Temperature: + 90 C
• Minimum Operating Temperature: 0 C
• Synchronous Pin: No
• Topology: Boost, Buck, Flyback
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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
www.vishay.com
Si9137
11