Description

The SG1842/43 family of control ICs 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.

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 (SG1842

only)

▪ Double-Pulse Suppression

▪ High-Current Totem-Pole Output (1A Peak)

▪ Internally Trimmed Bandgap Reference

▪ 500kHz Operation

▪ Undervoltage Lockout

SG1842 - 16 volts

SG1843 - 8.4 volts

▪ Low Shoot-Through Current <75mA Over

Temperature

Application

▪ Available To MIL-STD – 883, ¶ 1.2.1

▪ Available to DSCC

- Standard Microcircuit Drawing (SMD)