SI9110 Datasheet, PDF (1/8 Pages) Vishay Siliconix – High-Voltage Switchmode Controllers

Si9110/9111
Vishay Siliconix
High-Voltage Switchmode Controllers
FEATURES
D 10- to 120-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
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 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
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
Document Number: 70004
S-42037—Rev. H, 15-Nov-04
To
V_CC
4
OUTPUT
5 _−VIN
3
SENSE
V_CC
11
SHUTDOWN
12
RESET
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