UC3572D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

UC3572D属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由美国德州仪器公司制造生产的UC3572DDC-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。

FEATURES

• Simple Single Inductor Flyback PWM

for Negative Voltage Generation

• Drives External PMOS Switch

• Contains UVLO Circuit

• Includes Pulse-by-Pulse Current Limit

• Low 50μA Sleep Mode Current

DESCRIPTION

The UC3572 is a negative output flyback pulse width modulator which converts

a positive input voltage to a regulated negative output voltage. The

chip is optimized for use in a single inductor negative flyback switching converter

employing an external PMOS switch. The block diagram consists of

a precision reference, an error amplifier configured for voltage mode operation,

an oscillator, a PWM comparator with latching logic, and a 0.5A peak

gate driver. The UC3572 includes an undervoltage lockout circuit to insure

sufficient input supply voltage is present before any switching activity can

occur, and a pulse-by-pulse current limit. Output current can be sensed and

limited to a user determined maximum value. The UVLO circuit turns the

chip off when the input voltage is below the UVLO threshold. In addition, a

sleep comparator interfaces to the UVLO circuit to turn the chip off. This reduces

the supply current to only 50μA, making the UC3572 ideal for battery

powered applications.