Datasheet > UC2572_08

UC2572_08

更新时间： 2024-11-05 12:01:51

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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UC2572_08 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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型号	品牌	获取价格	描述	数据表
UC2572D	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572DG4	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572DTR	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572DTRG4	TI	获取价格	Negative Output Flyback Pulse Width Modulator 8-SOIC -40 to 85
UC2572J	ETC	获取价格	Analog IC
UC2572N	TI	获取价格	Negative Output Flyback Pulse Width Modulator 8-PDIP -40 to 85
UC2572NG4	TI	获取价格	0.7A SWITCHING CONTROLLER, 115kHz SWITCHING FREQ-MAX, PDIP8, GREEN, PLASTIC, DIP-8
UC2573	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Regulator
UC2573D	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Refgulator
UC2573DG4	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Refgulator