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UCC2975_15

更新时间： 2024-11-28 02:58:43
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德州仪器 - TI /
页数 文件大小 规格书
28页 434K
描述
MULTI-TOPOLOGY PIEZOELECTRIC TRANSFORMER CONTROLLER

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UCC2975_15 数据手册

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SLUS499A – NOVEMBER 2001 – REVISED JANUARY 2002  
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FEATURES  
DESCRIPTION  
D
3-V to 13.5-V Operation  
Liquid crystal display (LCD) enclosures and cold  
D
Supports Flyback (UCC3975), Half-Bridge  
(UCC3976), and Push-Pull (UCC3977)  
Topologies  
cathode fluorescent lamps (CCFLs) used in  
notebook computer and portable electronics  
displays are becoming increasingly narrow,  
generating the need for a low profile CCFL power  
supply. Recent advances in single- and  
multi-layered piezoelectric ceramic transformers  
(PZT) have enabled the development of a new  
generation of efficient, size-reduced backlight  
converters. The UCC3975/6/7 family of 8-pin PZT  
controllers integrate the necessary circuitry for  
operating a PZT-based backlight supply using a  
flyback, half-bridge, or push-pull topology. The  
choice of power topology depends on application  
requirements such as input voltage, lamp voltage,  
and PZT gain.  
D
D
D
D
D
Programmable Voltage Controlled Oscillator  
Open Lamp Protection  
Low Shutdown Current (15-µA Typical)  
Dual MOSFET Drivers  
8-Pin TSSOP package  
APPLICATIONS  
D
D
D
Notebook Computers  
Portable Electronics Displays  
Portable Instruments  
D
OPEN  
SHUTDOWN  
VDD  
C
OPEN  
R
OPEN  
1
2
OPEN/SD  
VDD  
8
7
R
OSC  
OUTP  
HV  
LRES  
C
OSC  
RANGE  
UCC3976  
R
OSC  
R
3
COMP  
OUTN  
6
5
PIEZO  
XFMR  
C
CNT  
FB  
4
FB  
GND  
R
R
FB  
D
FB  
CCFL  
CS  
UDG–01092  
Figure 1. UCC3976-Based CCFL Power Supply Using a Resonant Half-Bridge Topology  
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Copyright 2002, Texas Instruments Incorporated  
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