SG1843 Datasheet | Microsemi

DESCRIPTION The SG1842/43 family of control IC's provides all lockout, current limiting circuitry and start-up the necessary features to implement off-line fixed current of less than 1m A. The totem-pole output frequency, current-mode switching power supplies is optimized to drive the gate of a power with a minimum number of external ponents. MOSFET. The output is low in the off state to Current-mode architecture demonstrates improved provide direct interface to an N channel device. line regulation, improved load regulation, pulse- The SG1842/43 is specified for operation over by-pulse current limiting and inherent protection the full military ambient temperature range of of the power supply output switch. The bandgap 55°C to 125°C. The SG2842/43 is specified for reference is trimmed to ±1% over temperature. the industrial range of -25°C to 85°C, and the Oscillator discharge current is trimmed to less SG3842/43 is designed for the mercial range than ±10%. The SG1842/43 has under-voltage of 0°C to 70°C. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://.microsemi. PRODUCT HIGHLIGHT AC INPUT IST VCC SG3842 KEY FEATURES - OPTIMIZED FOR OFF-LINE CONTROL - LOW START-UP CURRENT (<1m A) - AUTOMATIC FEED FORWARD PENSATION - TRIMMED OSCILLATOR DISCHARGE CURRENT - PULSE-BY-PULSE CURRENT LIMITING - ENHANCED LOAD RESPONSE CHARACTERISTICS - UNDER-VOLTAGE LOCKOUT WITH 6V HYSTERESIS (SG1842 only) - DOUBLE-PULSE SUPPRESSION - HIGH-CURRENT TOTEM-POLE OUTPUT (1AMP PEAK) - INTERNALLY TRIMMED BANDGAP REFERENCE - 500KHZ OPERATION - UNDERVOLTAGE LOCKOUT SG1842 - 16 volts SG1843 - 8.4 volts - LOW SHOOT-THROUGH CURRENT <75m A OVER TEMPERATURE HIGH RELIABILITY FEATURES - AVAILABLE TO MIL-STD-883B AND DSCC - SCHEDULED FOR MIL-M38510 QPL...