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SI9121DB-3 Datasheet(PDF) 1 Page - Vishay Siliconix |
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SI9121DB-3 Datasheet(HTML) 1 Page - Vishay Siliconix |
1 / 9 page 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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