Si9110/9111
Vishay Siliconix
High-Voltage Switchmode Controllers
FEATURES
D
D
D
D
10- to 120-V Input Range
Current-Mode Control
High-Speed, Source-Sink Output Drive
High Efficiency Operation (> 80%)
D
Internal Start-Up Circuit
D
Internal Oscillator (1 MHz)
D
SHUTDOWN and RESET
D
Reference Selection
Si9110
−
"1%
Si9111
−
"10%
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 a standard 14-pin plastic DIP
and standard or lead (Pb)-free SOIC package, and are
specified over the and industrial, D suffix (−40 to 85_C)
temperature ranges.
FUNCTIONAL BLOCK DIAGRAM
OSC
IN
8
OSC
OUT
7
FB
14
COMP
DISCHARGE
13
9
Error
Amplifier
10
−
+
4V
Ref
Gen
2V
−
+
+
−
BIAS
1
Current
Sources
To
Internal
Circuits
1.2 V
C/L
Comparator
OSC
Clock (
1
/
2
f
OSC
)
V
REF
To
V
CC
Current-Mode
Comparator
R
Q
S
4
5
OUTPUT
−V
IN
3
V
CC
V
CC
6
SENSE
+V
IN
2
8.1 V
−
+
8.6 V
−
+
Undervoltage
Comparator
Q
S
R
11
12
SHUTDOWN
RESET
Pre-Regulator/Start-Up
Document Number: 70004
S-40751—Rev. G, 19-Apr-04
www.vishay.com
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