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SI9120DJ-E3 Datasheet(PDF) 1 Page - Vishay Siliconix

No. de pieza SI9120DJ-E3
Descripción Electrónicos  Universal Input Switchmode Controller
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Fabricante Electrónico  VISHAY [Vishay Siliconix]
Página de inicio  http://www.vishay.com
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SI9120DJ-E3 Datasheet(HTML) 1 Page - Vishay Siliconix

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Si9120
Vishay Siliconix
Document Number: 70006
S-42042—Rev. H, 15-Nov-04
www.vishay.com
1
Universal Input Switchmode Controller
FEATURES
D 10- to 450-V Input Range
D Current-Mode Control
D 125-mA Output Drive
D Internal Start-Up Circuit
D Internal Oscillator (1 MHz)
D SHUTDOWN and RESET
DESCRIPTION
The Si9120 is a BiC/DMOS integrated circuit designed for use
in low-power, high-efficiency off-line power supplies.
High-voltage DMOS inputs allow the controller to work over a
wide range of input voltages (10- to 450-VDC). Current-mode
PWM control circuitry is implemented in CMOS to reduce
quiescent current to less than 1.5 mA.
A CMOS output driver provides high-speed switching for
MOSFET devices with gate charge, Qg, up to 25 nC, enough
to supply 30 W of output power at 100 kHz. These devices,
when combined with an output MOSFET and transformer, can
be used to implement single-ended power converter
topologies (i.e., flyback and forward).
The Si9120 is available in both standard and lead (Pb)-free
16-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
15
14
10
9
8
2 V
Ref
Gen
R
S
Q
R
S
Q
SENSE
4
12
13
Current-Mode
Comparator
C/L
1.2 V
Undervoltage Comparator
RESET
8.1 V
8.6 V
BIAS
Current
Sources
To
Internal
Circuits
11
16
7
1
Comparator
Error
Amplifier
VREF
VCC
+VIN
VCC
SHUTDOWN
4 V (1%)
Clock (1/2 fOSC)
OSC
OUT
OSC
IN
Pre-Regulator/Start-Up
6
5
−VIN
OUTPUT
To
VCC
Applications information, see AN707 and AN708.


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