UC1572J

更新时间： 2024-11-06 12:27:11

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
9页	289K
描述
Negative Output Flyback Pulse Width Modulator

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UC1572J 数据手册

UC1572

UC2572

UC3572

Negative Output Flyback Pulse Width Modulator

FEATURES

DESCRIPTION

• Simple Single Inductor Flyback PWM

for Negative Voltage Generation

The UC3572 is a negative output flyback pulse width modulator which con-

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

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

verter employing an external PMOS switch. The block diagram consists of

a precision reference, an error amplifier configured for voltage mode opera-

tion, 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 re-

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

powered applications.

• Drives External PMOS Switch

• Contains UVLO Circuit

• Includes Pulse-by-Pulse Current Limit

• Low 50µA Sleep Mode Current

BLOCK DIAGRAM

UDG-94094-2

SLUS275A - MARCH 1999 - REVISED AUGUST 2001

12 3 4 5 6 7...9

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