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UCC2891 PDF预览

UCC2891

更新时间： 2024-11-25 22:59:31
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
34页 573K
描述
CURRENT MODE ACTIVE CLAMP PWM CONTROLLER

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中文翻译

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UCC2891 数据手册

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SLUS542A − OCTOBER 2003 − REVISED JULY 2004  
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FEATURES  
DESCRIPTION  
D
D
Ideal for Active Clamp/Reset Forward,  
Flyback Converters  
The UCC2891/2/3/4 family of PWM controllers is  
designed to simplify implementation of the various  
active clamp/reset switching power topologies.  
Provides Complementary Auxiliary Driver  
with Programmable Deadtime (Turn-On  
Delay) between AUX and MAIN Switches  
The UCC289x is a peak current-mode, fixed-  
frequency, high-performance pulse width modulator.  
It includes the logic and the drive capability for the  
auxiliary switch with a simple method of  
programming the critical delays for proper active  
clamp operation.  
D
Peak Current-Mode Control with  
Cycle-by-Cycle Current Limiting  
D
D
D
D
D
D
D
110-V Input Startup Regulator on UCC2891/3  
TrueDrivet 2-A Sink, 2-A Source Outputs  
Accurate Line UV and Line OV Threshold  
Programmable Slope Compensation  
1.0-MHz Synchronizable Oscillator  
The UCC2891/3 includes a 110-V start-up  
regulator for initial start-up and to provide  
keep-alive power during stand-by.  
Precise Programmable Maximum Duty Cycle  
Programmable Soft Start  
Additional features include an internal  
programmable slope compensation circuit,  
precise D  
limit, and a single resistor  
MAX  
programmable synchronizable oscillator. An  
accurate line monitoring function also programs  
the converter’s ON and OFF transitions with  
regard to the bulk input voltage. Along with the  
UCC2897, this UCC289x family allows the power  
supply designer to eliminate many of the external  
components, reducing the size and complexity of  
the design.  
APPLICATIONS  
D
150-W to 700-W SMPS  
D
High-Efficiency, Low EMI/RFI Off-Line or  
DC/DC Converters  
D
D
Server, 48-V Telecom, Datacom  
High Power Adapter, LCD-TV and PDP-TV  
BIAS  
WINDING  
UCC2891  
VIN  
+VIN  
BULK  
1
RDEL  
16  
15  
C
LOAD  
2
3
4
RTON LINEUV  
C
CLAMP  
Q2  
RTOFF  
VREF  
VDD 14  
OUT 13  
Q1  
SR  
DRIVE  
5
6
7
8
12  
SYNC  
GND  
AUX  
PGND 11  
SS/SD 10  
R
CS  
CS  
SECONDARY  
SIDE E/A  
RSLOPE  
FB  
9
UDG−02162  
R
F
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
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Copyright 2003, Texas Instruments Incorporated  
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中文翻译

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UCC2891 替代型号

型号 品牌 替代类型 描述 数据表
UCC2892 TI

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