Datasheet > UC1572DTR

UC1572DTR

更新时间： 2024-11-05 23:38:51

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UC1572DTR 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	获取价格	描述	数据表
UC1572J	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC1572N	ETC	获取价格	Analog IC
UC1573	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Regulator
UC1573D	ETC	获取价格	Voltage-Mode SMPS Controller
UC1573DTR	ETC	获取价格	Voltage-Mode SMPS Controller
UC1573J	TI	获取价格	Buck Pulse Width Modulator Stepdown Voltage Refgulator
UC1573N	ETC	获取价格	Analog IC
UC1584	TI	获取价格	Secondary Side Synchronous Post Regulator
UC1584_08	TI	获取价格	Secondary Side Synchronous Post Regulator
UC1584J	TI	获取价格	Secondary Side Synchronous Post Regulator