UCC1581

更新时间： 2024-11-28 22:17:51

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
9页	222K
描述
Micropower Voltage Mode PWM

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中文翻译

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数据手册

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UCC1581 数据手册

UCC1581

UCC2581

UCC3581

Micropower Voltage Mode PWM

BLOCK DIAGRAM

FEATURES

• Low 85µA Startup Current

• Low 300µA Operating Current

• Automatically Disabled

Startup Preregulator

• Programmable Minimum Duty

Cycle with Cycle Skipping

• Programmable Maximum

Duty Cycle

• Output Current 1A Peak

Source and Sink

• Programmable Soft Start

• Programmable Oscillator

Frequency

• External Oscillator

Synchronization Capability

UDG-95011-1

Note: Pin Connection shown for 14-pin Package

DESCRIPTION

The UCC3581 voltage mode pulse width modulator is A linear preregulator driver in conjunction with an exter-

designed to control low power isolated DC - DC convert- nal depletion mode N-MOSFET provides initial controller

ers in applications such as Subscriber Line Power (ISDN power. Once the bootstrap supply is functional, the

I.430). Primarily used for single switch forward and preregulator is shut down to conserve power. During light

flyback converters, the UCC3581 features BiCMOS cir- load, power is saved by providing a programmable mini-

cuitry for low startup and operating current, while main- mum duty cycle clamp. When a duty cycle below the

taining the ability to drive power MOSFETs at minimum is called for, the modulator skips cycles to pro-

frequencies up to 100kHz. The UCC3581 oscillator al- vide the correct average duty cycle required for output

lows the flexibility to program both the frequency and the regulation. This effectively reduces the switching fre-

maximum duty cycle with two resistors and a capacitor. A quency, saving significant gate drive and power stage

TTL level input is also provided to allow synchronization losses.

to an external frequency source.

The UCC3581 is available in 14-pin plastic and ceramic

The UCC3581 includes programmable soft start circuitry, dual-in-line packages and in a 14-pin narrow body small

overcurrent detection, a 7.5V linear preregulator to con- outline IC package (SOIC). The UCC1581 is specified for

trol chip VDD during startup, and an on-board 4.0V logic

supply.

operation from −55°C to +125°C, the UCC2581 is speci-

fied for operation from −40°C to +85°C, and the

UCC3581 is specified for operation from 0°C to +70°C.

The UCC3581 provides functions to maximize light load

efficiency that are not normally found in PWM controllers.

SLUS295 - MARCH 1999

12 3 4 5 6 7...9

中文翻译

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与UCC1581相关器件

型号	品牌	获取价格	描述	数据表
UCC1581_13	TI	获取价格	Micropower Voltage Mode PWM
UCC1581J	TI	获取价格	Micropower Voltage Mode PWM
UCC1581L	TI	获取价格	1A SWITCHING CONTROLLER, CQCC20
UCC1583	TI	获取价格	Switch Mode Secondary Side Post Regulator
UCC1583D	TI	获取价格	1.8A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, SOIC-14
UCC1583J	TI	获取价格	1.8A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP14, CERAMIC, DIP-14
UCC1583N	TI	获取价格	1.8A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP14, PLASTIC, DIP-14
UCC1585J	TI	获取价格	1A SWITCHING CONTROLLER, 700kHz SWITCHING FREQ-MAX, CDIP16, DIP-16
UCC1588-1D	TI	获取价格	1A SWITCHING CONTROLLER, 700kHz SWITCHING FREQ-MAX, PDSO16, SOIC-16
UCC1588-1PW	TI	获取价格	1A SWITCHING CONTROLLER, 700kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16

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