UC3842屬于集成電路（IC）的DC-DC開關(guān)控制器。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的UC3842DC-DC 開關(guān)控制器PMIC（電源管理集成電路）DC 到 DC 開關(guān)式控制器是用于高效率電路的穩(wěn)壓 IC，其配置為生成高于（突升或步升）或低于（突降或步降）輸入電源的輸出電源電壓。其他拓?fù)浣Y(jié)構(gòu)可能包括：降壓-升壓、反激、正激、Cuk、SEPIC、全橋、半橋和推挽式。這些器件不同于需要最小電壓并“燒盡”多余電壓的線性穩(wěn)壓器。

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