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UCC3581 PDF预览

UCC3581

更新时间： 2024-11-28 22:52:39
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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UCC3581 数据手册

 浏览型号UCC3581的Datasheet PDF文件第2页浏览型号UCC3581的Datasheet PDF文件第3页浏览型号UCC3581的Datasheet PDF文件第4页浏览型号UCC3581的Datasheet PDF文件第5页浏览型号UCC3581的Datasheet PDF文件第6页浏览型号UCC3581的Datasheet PDF文件第7页 
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  
1234567...9

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UCC3581 替代型号

型号 品牌 替代类型 描述 数据表
UCC2581 TI

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 Micropower Voltage Mode PWM

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