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SI9120DJ-E3 Datasheet(PDF) 1 Page - Vishay Siliconix |
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SI9120DJ-E3 Datasheet(HTML) 1 Page - Vishay Siliconix |
1 / 6 page 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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