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SI9112DY-T1 Fiches technique(PDF) 1 Page - Vishay Siliconix

No de pièce SI9112DY-T1
Description  High-Voltage Switchmode Controller
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9112DY-T1 Fiches technique(HTML) 1 Page - Vishay Siliconix

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Si9112
Vishay Siliconix
sDocument Number: 70005
S-42036—Rev. H, 15-Nov-04
www.vishay.com
1
High-Voltage Switchmode Controller
FEATURES
D 9- to 80-V Input Range
D Current-Mode Control
D High-Speed, Source-Sink Output Drive
D High Efficiency Operation (> 80%)
D Internal Start-Up Circuit
D Internal Oscillator (1 MHz)
D SHUTDOWN and RESET
DESCRIPTION
The Si9112 is a BiC/DMOS integrated circuit designed for use
in high-efficiency switchmode power converters. A
high-voltage DMOS input allows this controller to work over a
wide range of input voltages (9- to 80-VDC). Current-mode
PWM control circuitry is implemented in CMOS to reduce
internal power consumption to less than 10 mW.
A CMOS output driver provides high-speed switching of
MOSPOWER devices large enough to supply 50 W of output
power. When combined with an output MOSFET and
transformer, the Si9112 can be used to implement
single-ended power converter topologies (i.e., flyback,
forward, and cuk).
The Si9112 is 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
+
+
+
+
+
FB
COMP
DISCHARGE
OSC
14
13
9
8
7
2 V
Ref
Gen
R
S
Q
R
S
Q
SENSE
3
11
12
Current-Mode
Comparator
C/L
1.2 V
Undervoltage Comparator
RESET
8.1 V
8.7 V
BIAS
Current
Sources
To
Internal
Circuits
10
1
6
2
Comparator
Error
Amplifier
VREF
VCC
+VIN
VCC
SHUTDOWN
4 V (2%)
OSC
OUT
OSC
IN
Pre-Regulator/Start-Up
5
4
−VIN
OUTPUT
To
VCC
Clock (1/2 fOSC)
Applications information, see AN703.


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