L5991A集成电路（IC）的PMIC-稳压器-DCDC开关式控制器规格书PDF中文资料

L5991A属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由意法半导体集团制造生产的L5991ADC-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。

DESCRIPTION

This primary controller I.C., developed in BCD60II technology, has been designed to implement off line or DC-DC power supply applications using a fixed frequency current mode control.

Based on a standard current mode PWM control ler this device includes some features such as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns leading edge blanking on current sense, pulse by pulse current limit, over current protection with soft start intervention, and Standby function for oscillator frequency reduction when the converter is lightly loaded.

■ CURRENT-MODE CONTROL PWM

■ SWITCHING FREQUENCY UP TO 1MHz

■ LOW START-UP CURRENT (< 120µA)

■ HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER MOSFET (1A)

■ FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION

■ PROGRAMMABLE DUTY CYCLE

■ 100 AND 50 MAXIMUM DUTY CYCLE LIMIT

■ STANDBY FUNCTION

■ PROGRAMMABLE SOFT START

■ PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY

■ PWM UVLO WITH HYSTERESIS

■ IN/OUT SYNCHRONIZATION

■ LATCHED DISABLE

■ INTERNAL 100ns LEADING EDGE BLANKING OF CURRENT SENSE

■ PACKAGE: DIP16 AND SO16