SI9102_07 Datasheet, PDF (1/10 Pages) Vishay Siliconix – 3-W High-Voltage Switchmode Regulator

Si9102
Vishay Siliconix
3-W High-Voltage Switchmode Regulator
DESCRIPTION
The Si9102 high-voltage switchmode regulator is a mono-
lithic 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 un-
regulated 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.
FEATURES
• 10 to 120 V Input Range
• Current-Mode Control
• On-chip 200 V, 7 Ω MOSFET Switch
• SHUTDOWN and RESET
• High Efficiency Operation (> 80 %)
• Internal Start-Up Circuit
• Internal Oscillator (1 MHz)
FUNCTIONAL BLOCK DIAGRAM
10 (14)
V_REF
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-70497-Rev. H, 19-Mar-07
Note: Figures in parenthesis represent pin numbers for 20-pin package.
www.vishay.com
1