Si9110, Si9111
Vishay Siliconix
High-Voltage Switchmode Controllers
DESCRIPTION
The Si9110/9111 are BiC/DMOS integrated circuits
designed for use as high-performance switchmode
controllers. A high-voltage DMOS input allows the controller
to work over a wide range of input voltages (10 to 120 VDC).
Current-mode PWM control circuitry is implemented in
CMOS to reduce internal power consumption to less than
10 mW.
A push-pull output driver provides high-speed switching for
MOSPOWER devices large enough to supply 50 W of output
power. When combined with an output MOSFET and
transformer, the Si9110/9111 can be used to implement
single-ended power converter topologies (i.e., flyback,
forward, and cuk).
The Si9110/9111 are available in both standard and lead
(Pb)-free 14-pin plastic DIP and SOIC packages which are
specified to operate over the industrial temperature range of
- 40 °C to 85 °C.
FEATURES
•
•
•
•
•
•
•
•
10 V to 120 V Input Range
Current-Mode Control
High-Speed, Source-Sink Output Drive
High Efficiency Operation (> 80 %)
Internal Start-Up Circuit
Internal Oscillator (1 MHz)
SHUTDOWN and RESET
Reference Selection
Si9110 - ± 1 %
Si9111 - ± 10 %
FUNCTIONAL BLOCK DIAGRAM
FB
14
13
COMP
DISCHARGE
9
OSC
IN
8
OSC
OUT
7
Error
Amplifier
10
OSC
Clock (
1
/
2
f
OSC
)
-
+
4V
2V
Ref
Gen
To
V
CC
V
REF
-
+
Current-Mode
Comparator
4
R
Q
S
5
OUTPUT
-
V
IN
+
-
1
BIAS
6
Current
Sources
To
Internal
Circuits
1.2 V
C/L
Comparator
3
V
CC
SENSE
V
CC
+V
IN
2
-
8.1 V
+
Undervoltage
Comparator
Q
S
R
11
12
SHUTDOWN
RESET
-
+
8.6 V
Pre-Regulator/Start-Up
Document Number: 70004
S11-0975-Rev. I, 16-May-11
www.vishay.com
1
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
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