UC2572

更新时间： 2024-09-14 22:17:51

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
5页	131K
描述
Negative Output Flyback Pulse Width Modulator

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UC2572 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

converter employing an external PMOS switch. The block diagram consists

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

eration, 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 activ-

ity 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.

• Drives External PMOS Switch

• Contains UVLO Circuit

• Includes Pulse-by-Pulse Current Limit

• Low 50µA Sleep Mode Current

BLOCK DIAGRAM

UDG-94094-2

03/99

12 3 4 5

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型号	品牌	替代类型	描述	数据表
UC3572	TI	功能相似	Negative Output Flyback Pulse Width Modulator

型号	品牌	获取价格	描述	数据表
UC2572_08	TI	获取价格	Negative Output Flyback Pulse Width Modulator
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