參數(shù)資料
型號(hào)： UCC2977TRPW
廠商： Texas Instruments, Inc.
英文描述： Precision 500 mA regulators
中文描述： 鎮(zhèn)流器/背光控制器/驅(qū)動(dòng)器| TSSOP封裝| 8引腳|塑料
文件頁數(shù)： 1/28頁
文件大?。?/td> 433K
代理商： UCC2977TRPW
SLUS499A – NOVEMBER 2001 – REVISED JANUARY 2002
1
www.ti.com
FEATURES
3-V to 13.5-V Operation
Supports Flyback (UCC3975), Half-Bridge
(UCC3976), and Push-Pull (UCC3977)
Topologies
Programmable Voltage Controlled Oscillator
Open Lamp Protection
Low Shutdown Current (15-
μ
A Typical)
Dual MOSFET Drivers
8-Pin TSSOP package
APPLICATIONS
Notebook Computers
Portable Electronics Displays
Portable Instruments
DESCRIPTION
Liquid crystal display (LCD) enclosures and cold
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.
RANGE
1
3
2
4
8
6
7
5
OPEN/SD
OSC
COMP
FB
VDD
OUTP
OUTN
GND
CFB
RFB
DFB
CCFL
RCS
COSC
ROSC
LRES
PIEZO
XFMR
RHV
RCNT
VDD
COPEN
ROPEN
SHUTDOWN
UCC3976
DOPEN
UDG–01092
Figure 1. UCC3976-Based CCFL Power Supply Using a Resonant Half-Bridge Topology
Copyright
2002, Texas Instruments Incorporated
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