DESCRIPTION

TheUC3842/3/4/5family of controlICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes witha minimal external parts count.

■ OPTIMIZED FOR OFF-LINE AND DC TO DC

CONVERTERS

■ LOW START-UP CURRENT (< 1 mA)

■ AUTOMATIC FEED FORWARD COMPENSATION

■ PULSE-BY-PULSECURRENT LIMITING

■ ENHANCED LOAD RESPONSE CHARACTERISTICS

■ UNDER-VOLTAGE LOCKOUTWITH HYSTERESIS

■ DOUBLE PULSE SUPPRESSION

■ HIGH CURRENT TOTEM POLE OUTPUT

■ INTERNALLY TRIMMED BANDGAP REFERENCE

■ 500 KHz OPERATION

■ LOW RO ERRORAMP