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SI9110_11

Description
SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP14
CategoryPower/power management   
File Size170KB,10 Pages
ManufacturerVishay
Websitehttp://www.vishay.com
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SI9110_11 Overview

SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP14

End of Life. Last Available Purchase Date is 31-Dec-2014
Si9110/9111
Vishay Siliconix
High-Voltage Switchmode Controllers
FEATURES
10- 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%
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
OSC
IN
8
OSC
OUT
7
FB
14
COMP
DISCHARGE
13
9
Error
Amplifier
10
+
4V
Ref
Gen
2V
+
+
1
BIAS
6
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
SENSE
V
CC
+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-42037—Rev. H, 15-Nov-04
www.vishay.com
1

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