SI9102 Datasheet, PDF (1/7 Pages) Vishay Siliconix – 3-W High-Voltage Switchmode Regulator

Si9102
Vishay Siliconix
3-W High-Voltage Switchmode Regulator
FEATURES
D 10- to 120-V Input Range
D Current-Mode Control
D On-chip 200-V, 7-W MOSFET Switch
D SHUTDOWN and RESET
D High Efficiency Operation (> 80%)
D Internal Start-Up Circuit
D Internal Oscillator (1 MHz)
DESCRIPTION
The Si9102 high-voltage switchmode regulator is a monolithic
BiC/DMOS integrated circuit which contains most of the
components necessary to implement a high-efficiency
dc-to-dc converter up to 3 watts. It can either be operated from
a low-voltage dc supply, or directly from a 10- to 120-V
unregulated dc power source.
This device may be used with an appropriate transformer to
implement most single-ended isolated power converter
topologies (i.e., flyback and forward).
The Si9102 is available in both standard and lead (Pb)-free
14-pin plastic DIP and 20-pin PLCC packages which are
specified to operate over the industrial temperature range of
−40_C to 85_C.
FUNCTIONAL BLOCK DIAGRAM
V_REF
10 (14)
1 (2)
BIAS
6 (9)
V_CC
+V_IN
2 (3)
FB
14 (20)
COMP DISCHARGE
13 (18)
9 (12)
OSC OSC
IN OUT
8 (11)
7 (10)
Error
Amplifier
−
+
4 V (1%)
Ref
Gen
2V
−
+
+
−
Current
Sources
1.2 V
To
Internal
Circuits
Current-Mode
Comparator
OSC
Clock (¹/₂ f_OSC)
R
Q
S
C/L
Comparator
8.8 V
Undervoltage
Comparator
−
+
−
+
9.4 V
S
Q
R
3 (5)
DRAIN
5 (8)
−V_IN
(BODY)
4 (7)
SOURCE
V_CC
11 (16) _SHUTDOWN
12 (17) _RESET
Document Number: 70001
S-42040—Rev. G, 15-Nov-04
Note: Figures in parenthesis represent pin numbers for 20-pin package.
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