SI9110_11 Datasheet, PDF (1/9 Pages) Vishay Siliconix – High-Voltage Switchmode Controllers

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.
FUNCTIONAL BLOCK DIAGRAM
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 %
FB
14
COMP DISCHARGE
13
9
OSC OSC
IN OUT
8
7
10
V_REF
1
BIAS
6
V_CC
2
+V_IN
Error
Amplifier
-
+
4V
Ref
Gen
2V
-
+
Current
Sources
To
Internal
Circuits
+
-
1.2 V
OSC
Clock (¹/₂ f_OSC)
Current-Mode
Comparator
C/L
Comparator
R
Q
S
8.1 V
-
+
8.6 V
Pre-Regulator/Start-Up
Undervoltage
Comparator
-
+
S
Q
R
To
V_CC
4
OUTPUT
5 _{- VIN}
3
SENSE
V_CC
11
SHUTDOWN
12
RESET
Document Number: 70004
www.vishay.com
S11-0975-Rev. I, 16-May-11
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