DESCRIPTION

The UC384xA family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequencycurrent mode control schemes with a minimal external parts count. Internally implemented circuits includea trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lock out featuring start-up current less than0.5mA,a precision reference trimmed for accuracy at the error amp input,logic to in sure latched operation,a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peakcurrent.The output stage,suitable

for driving N-Channel MOSFETs, is low in the off state.

. TRIMMED OSCILLATOR DISCHARGE CURRENT

. CURRENT MODE OPERATION TO 500kHz

. AUTOMATIC FEED FORWARD COMPENSATION

. LATCHING PWM FOR CYCLE-BY-CYCLECURRENT LIMITING

. INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT

. HIGH CURRENT TOTEM POLE OUTPUT

. UNDERVOLTAGE LOCKOUT WITH HYSTERESIS

. LOW START-UP CURRENT (< 0.5mA)

. DOUBLE PULSE SUPPRESSION

UC3844AN属于集成电路（IC） > DC-DC 开关控制器。意法半导体（ST）集团制造生产的UC3844ANDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。