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SI9112DY-T1 Fiches technique(PDF) 1 Page - Vishay Siliconix |
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SI9112DY-T1 Fiches technique(HTML) 1 Page - Vishay Siliconix |
1 / 6 page Si9112 Vishay Siliconix sDocument Number: 70005 S-42036—Rev. H, 15-Nov-04 www.vishay.com 1 High-Voltage Switchmode Controller FEATURES D 9- to 80-V Input Range D Current-Mode Control D High-Speed, Source-Sink Output Drive D High Efficiency Operation (> 80%) D Internal Start-Up Circuit D Internal Oscillator (1 MHz) D SHUTDOWN and RESET DESCRIPTION The Si9112 is a BiC/DMOS integrated circuit designed for use in high-efficiency switchmode power converters. A high-voltage DMOS input allows this controller to work over a wide range of input voltages (9- to 80-VDC). Current-mode PWM control circuitry is implemented in CMOS to reduce internal power consumption to less than 10 mW. A CMOS output driver provides high-speed switching of MOSPOWER devices large enough to supply 50 W of output power. When combined with an output MOSFET and transformer, the Si9112 can be used to implement single-ended power converter topologies (i.e., flyback, forward, and cuk). The Si9112 is available in both standard and lead (Pb)-free 14-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 14 13 9 8 7 2 V Ref Gen R S Q R S Q SENSE 3 11 12 Current-Mode Comparator C/L 1.2 V Undervoltage Comparator RESET 8.1 V 8.7 V BIAS Current Sources To Internal Circuits 10 1 6 2 Comparator Error Amplifier VREF VCC +VIN VCC SHUTDOWN 4 V (2%) OSC OUT OSC IN Pre-Regulator/Start-Up 5 4 −VIN OUTPUT To VCC Clock (1/2 fOSC) Applications information, see AN703. |
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