SI9102

Si9102 Vishay Siliconix 3-W High-Voltage Switchmode Regulator FEATURES D 10- to 120-V Input Range D Current-Mode Control D On-chip 200-V, 7-W MOSFET Switch D SHUTDOWN and RESET D High Efficiency Operation (> 80%) D Internal Start-Up Circuit D Internal Oscillator (1 MHz) DESCRIPTION The Si9102 high-voltage switchmode regulator is a monolithic BiC/DMOS integrated circuit which contains most of the components necessary to implement a high-efficiency dc-to-dc converter up to 3 watts. It can either be operated from a low-voltage dc supply, or directly from a 10- to 120-V unregulated dc power source. This device may be used with an appropriate transformer to implement most single-ended isolated power converter topologies (i.e., flyback and forward). The Si9102 is available in both standard and lead (Pb)-free 14-pin plastic DIP and 20-pin PLCC packages which are specified to operate over the industrial temperature range of −40 _C to 85 _C. FUNCTIONAL BLOCK DIAGRAM FB 14 (20) COMP 13 (18) Error Amplifier DISCHARGE 9 (12) OSC IN 8 (11) OSC OUT 7 (10) OSC 2V − + + − 1.2 V C/L Comparator Clock (1/2 fOSC) Current-Mode Comparator R Q S 3 (5) 5 (8) DRAIN −VIN (BODY) VREF 10 (14) − + 4 V (1%) Ref Gen BIAS 1 (2) Current Sources VCC 6 (9) To Internal Circuits 4 (7) VCC Undervoltage Comparator Q R 11 (16) 12 (17) SOURCE +VIN 2 (3) 8.8 V − + 9.4 V − + S SHUTDOWN RESET Note: Figures in parenthesis represent pin numbers for 20-pin package. Document Number: 70001 S-42040...