SI9110

Si9110/9111 Vishay Siliconix High-Voltage Switchmode Controllers FEATURES D D D D 10- to 120-V Input Range Current-Mode Control High-Speed, Source-Sink Output Drive High Efficiency Operation (> 80%) D Internal Start-Up Circuit D Internal Oscillator (1 MHz) D SHUTDOWN and RESET D Reference Selection Si9110 − "1% Si9111 − "10% DESCRIPTION The Si9110/9111 are BiC/DMOS integrated circuits designed for use as high-performance switchmode controllers. A high-voltage DMOS input allows the controller to work over a wide range of input voltages (10- to 120-VDC). Current-mode PWM control circuitry is implemented in CMOS to reduce internal power consumption to less than 10 mW. A push-pull output driver provides high-speed switching for MOSPOWER devices large enough to supply 50 W of output power. When combined with an output MOSFET and transformer, the Si9110/9111 can be used to implement single-ended power converter topologies (i.e., flyback, forward, and cuk). The Si9110/9111 are available in a standard 14-pin plastic DIP and standard or lead (Pb)-free SOIC package, and are specified over the and industrial, D suffix (−40 to 85_C) temperature ranges. FUNCTIONAL BLOCK DIAGRAM OSC IN 8 OSC OUT 7 FB 14 COMP DISCHARGE 13 9 Error Amplifier 10 − + 4V Ref Gen 2V − + + − BIAS 1 Current Sources To Internal Circuits 1.2 V C/L Comparator OSC Clock (1/2 fOSC) VREF To VCC Current-Mode Comparator R Q S 4 5 OUTPUT −VIN 3 VCC VCC 6 SENSE +VIN 2 8.1 V − + 8.6 V − + Undervoltage Co...