UC2572 - 负输出反向脉宽调制器

UC2572是TI德州仪器公司的一款控制器（外部开关）产品，UC2572是负输出反向脉宽调制器，本站介绍了UC2572的封装应用图解、特点和优点、功能等，并给出了与UC2572相关的TI元器件型号供参考。

UC2572 - 负输出反向脉宽调制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

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 50uA, making the UC3572 ideal for battery powered applications.

产品特性

Simple Single Inductor Flyback PWM for Negative Voltage Generation
Drives External PMOS Switch
Contains UVLO Circuit
Includes Pulse-by-Pulse Current Limit
Low 50uA Sleep Mode Current

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