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PDF SI9100 Data sheet ( Hoja de datos )
| Número de pieza | SI9100 | |
| Descripción | 3-W High-Voltage Switchmode Regulator | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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Si9100
Vishay Siliconix
3-W High-Voltage Switchmode Regulator
FEATURES
D 10- to 70-V Input Range
D Current-Mode Control
D On-Chip 150-V, 5-W MOSFET Switch
D Reference Selection
Si9100 − "1%
D High Efficiency Operation (> 80%)
D Internal Start-Up Circuit
D Internal Oscillator (1 MHz)
D SHUTDOWN and RESET
DESCRIPTION
The Si9100 high-voltage switchmode regulators are
monolithic BiC/DMOS integrated circuits which contain most of
the components necessary to implement high-efficiency
dc-to-dc converters up to 3 watts. They can either be operated
from a low-voltage dc supply, or directly from a 10- to 70-V
unregulated dc power source. The Si9100 may be used with
an appropriate transformer to implement most single-ended
isolated power converter topologies (i.e., flyback and forward),
or by using a level shift circuit can generate a +5-V or a −5-V
non-isolated output from a −48-V source.
The Si9100 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
FB
14 (20)
COMP DISCHARGE
13 (18)
9 (12)
OSC OSC
IN OUT
8 (11)
7 (10)
VREF
10 (14)
1 (2)
BIAS
VCC 6 (9)
+VIN
2 (3)
Error
Amplifier
−
+
4 V (1%)
2V
Ref
Gen
−
+
+
−
Current
Sources
1.2 V
To
Internal
Circuits
Current-Mode
Comparator
C/L
Comparator
OSC
Clock (1/2 OSC)
R
Q
S
8.8 V
Undervoltage Comparator
−
+
−
+ 9.4 V
S
Q
R
Note: Figures in parenthesis represent pin numbers for 20-pin package.
Applications information, see AN702 and AN713.
Document Number: 70000
S-42041—Rev. G, 15-Nov-04
3 (5) DRAIN
5 (8)
(B−OVDINY)
VCC 4 (7) SOURCE
11 (16) SHUTDOWN
12 (17) RESET
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Si9100
Vishay Siliconix
PIN CONFIGURATIONS
PDIP-14
1 14
2 13
3 12
4 11
5 10
69
78
Top View
PLCC-20
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
Top View
PIN DESCRIPTION
Pin
Function
BIAS
+VIN
DRAIN
SOURCE
−VIN
VCC
OSC OUT
OSC IN
DISCHARGE
VREF
SHUTDOWN
RESET
COMP
FB
14-Pin DIP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
20-Pin PLCC*
2
3
5
7
8
9
10
11
12
14
16
17
18
20
*Pins 1, 4, 6, 13, 15, and 19 = N/C
Standard
Part Number
Si9100DJ02
Si9100DN02
ORDERING INFORMATION
Lead (Pb)-Free Temperature
Part Number
Range
Si9100DJ02—E3
Si9100DN02—E3
−40 to 85 _C
Package
PDIP-14
PLCC-20
DETAILED DESCRIPTION
Pre-Regulator/Start-Up Section
Due to the low quiescent current requirement of the Si9100
control circuitry, bias power can be supplied from the
unregulated input power source, from an external regulated
low-voltage supply, or from an auxiliary “bootstrap” winding on
the output inductor or transformer.
When power is first applied during start-up, +VIN will draw a
constant current. The magnitude of this current is determined
by a high-voltage depletion MOSFET device which is
connected between +VIN and VCC. This start-up circuitry
provides initial power to the IC by charging an external bypass
capacitance connected to the VCC pin. The constant current is
Document Number: 70000
S-42041—Rev. G, 15-Nov-04
disabled when VCC exceeds 9.4 V. If VCC is not forced to
exceed the 9.4-V threshold, then VCC will be regulated to a
nominal value of 9.4 V by the pre-regulator circuit.
As the supply voltage rises toward the normal operating
conditions, an internal undervoltage (UV) lockout circuit keeps
the output MOSFET disabled until VCC exceeds the
undervoltage lockout threshold (typically 8.8 V). This
guarantees that the control logic will be functioning properly
and that sufficient gate drive voltage is available before the
MOSFET turns on. The design of the IC is such that the
undervoltage lockout threshold will not exceed the
pre-regulator turn-off voltage. Power dissipation can be
minimized by providing an external power source to VCC such
that the constant current source is always disabled.
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5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SI9100.PDF ] | |
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