Description:
The SG1842/43 family of control IC's provides all the necessary features to implement off-line fixed frequency, current-mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation, improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1842/43 has under
PRODUCT voltage lockout, current limiting circuitry and start-up current of less than 1mA. The totem-pole output is optimized to drive the gate of a power MOSFET. The output is low in the off state to provide direct interface to an N channel device. The SG1842/43 is specified for operation over the full military ambient temperature range of -55℃ to 125℃. The SG2842/43 is specified for the industrial range of -25℃ to 85C, and the SG3842/43 is designed for the commercial range of 0℃ to 70℃.
FEATURES:
■ OPTIMIZED FOR OFF-LINE CONTROL
■ LOW START-UP CURRENT (<1mA)
■ AUTOMATIC FEED FORWARD COMPENSATION
■ TRIMMED OSCILLATOR DISCHARGE CURRENT
■ PULSE-BY-PULSE CURRENT LIMITING
■ ENHANCED LOAD RESPONSE CHARACTERISTICS
■ UNDER-VOLTAGE LOCKOUT WITH 6V HYSTERESIS (SG1842Y only)
■ DOUBLE-PULSE SUPPRESSION
■ HIGH-CURRENT TOTEM-POLE OUTPUT (1AMP PEAK)
■ INTERNALLY TRIMMED BANDGAP REFERENCE
■ 500KHZ OPERATION
■ UNDERVOLTAGE LOCKOUT SG1842Y - 16 volts SG1843 - 8.4 volts
■ LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE
HIGH RELIABILITY FEATURES:
■ AVAILABLE TO MIL-STD-883B AND DESC SMD
■ SCHEDULED FOR MIL-M38510 QPL LISTING
■ RADIATION DATA AVAILABLE
■ LINFINITY LEVEL "S" PROCESSING AVAILABLE
Feature
- Available To MIL-STD – 883, ¶ 1.2.1
- Available to DSCC - Standard Microcircuit Drawing (SMD)
(Picture: Pinout)
