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SI9121DB-5 数据表(PDF) 1 Page - Vishay Siliconix

部件名 SI9121DB-5
功能描述  High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones
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制造商  VISHAY [Vishay Siliconix]
网页  http://www.vishay.com
标志 VISHAY - Vishay Siliconix

SI9121DB-5 数据表(HTML) 1 Page - Vishay Siliconix

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Si9121
Vishay Siliconix
Document Number: 71112
S-40708—Rev. C, 19-Apr-04
www.vishay.com
1
High-Voltage, Non-Isolated Buck-Boost Converter
for ISDN Digital Phones
FEATURES
D Fixed +5-V or +3.3-V Output
D Integrated Floating Feedback Amplifier
D On-Chip 70-V, 1.5-W N-Channel
MOSFET Switch
D Integrated High Voltage Start-Up Circuit,
with VCC Regulator
D −10-V to −60-V Input Voltage Range
D 95-kHz PWM Operation
D Integrated Soft-Start and Oscillator
D High Efficiency Over Full Load Range
D Under Voltage Lockout
D Current Mode Control
D Hiccup Mode Short Circuit
Protection
D Thermal Shutdown
D SOIC-8 Narrow-Body Package
DESCRIPTION
The Si9121 simplifies the −48-V to +5-V or +3.3-V converter
design for ISDN application by integrating the floating
feedback error amplifier providing direct output voltage
regulation. This approach eliminates the need for an external
shunt regulator. The Si9121 also integrates a high voltage
depletion mode MOSFET which allows the converter to be
powered directly from the high input bus voltage without
requiring an external start-up circuit. Combined with simple
magnetic design due to its non-isolated topology, the Si9121
provides a one-chip solution for complete ISDN power supply.
In order to reduce external component count, the Si9121 has
a fully integrated 95-kHz oscillator and soft-start circuit.
The Si9121 is available in both standard and lead (Pb)-free
SOIC-8 pin packages, and is offered in either +5-V or +3.3-V
fixed
output
options
(Si9121DY-5
or
Si9121DY-3,
respectively).
In order to satisfy the stringent ambient
temperature requirements in many applications, the Si9121 is
rated to the industrial temperature range of −40_C to 85_C.
FUNCTIONAL BLOCK DIAGRAM
VNEG
−48 V
VOUT
+5 V/400 mA
or
+3.3 V/400 mA
VCC Regulator
Reference Generator
Control
VCC
LX
BYPASS
COMP
VNEG
CS
VOUT
GND


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