UCC3972

更新时间： 2024-11-07 22:39:59

品牌	Logo	应用领域
德州仪器 - TI		驱动器控制器
页数	文件大小	规格书
17页	310K
描述
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller

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中文翻译

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数据手册

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UCC3972 数据手册

UCC1972/3

UCC2972/3

UCC3972/3

BiCMOS Cold Cathode Fluorescent Lamp Driver Controller

FEATURES

DESCRIPTION

• 1mA Typical Supply Current

Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used

in a notebook computer or portable application include small size, high effi-

ciency, and low cost. The UCC3972/3 CCFL controllers provide the neces-

sary circuit blocks to implement a highly efficient CCFL backlight power

supply in a small footprint 8 pin TSSOP package. The BiCMOS controllers

typically consume less than 1mA of operating current, improving overall

system efficiency when compared to bipolar controllers requiring 5mA to

10mA of operating current.

• Accurate Lamp Current Control

• Analog or Low Frequency Dimming

Capability

• Open Lamp Protection

• Programmable Startup Delay

• 4.5V to 25V Operation

External parts count is minimized and system cost is reduced by integrat-

ing such features as a feedback controlled PWM driver stage, open lamp

protection, startup delay and synchronization circuitry between the buck

and push-pull stages. The UCC3972/3 include an internal shunt regulator,

allowing the part to operate with input voltages from 4.5V up to 25V. The

part supports both analog and externally generated low frequency dimming

modes of operation.

• PWM Frequency Synchronized to

External Resonant Tank

• 8 Pin TSSOP and SOIC Packages

Available

• Internal Voltage Clamp Protects

Transformer from Over-voltage

(UCC3973)

The UCC3973 adds a programmable voltage clamp at the BUCK pin. This

feature can be used to protect the transformer from overvoltage during

startup or when an open lamp occurs. Transformer voltage is controlled by

reducing duty cycle when an over-voltage is detected.

TYPICAL APPLICATION CIRCUIT

C6 27pF

UCC3972 NO INTERNAL VOLTAGE CLAMP

INTERNAL VOLTAGE CLAMP LIMITS TRANSFORMER

VOLTAGE AT START-UP OR DURING FAULT

UCC3973

SYSTEM VOLTAGE

(4.5V TO 25V)

R2 1k

C5 0.1µF

1kΩ

UCC3972/3

VDD

R10

R11

6.8µF

VBAT

1µF

LAMP

0.1µF

GND

68µH

LAMP

BUCK

MODE

COMP

ANALOG

DIMMING

1µF

R6 75Ω

OUT

R5 10k

R4 750

R3 68k

LOW FREQUENCY DIMMING

68k

C4 33nF

LFD

0V-5V LOW FREQUENCY CONTROL SIGNAL

UDG-99154

SLUS252A - JANUARY 2000

12 3 4 5 6 7...17

中文翻译

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与UCC3972相关器件

型号	品牌	获取价格	描述	数据表
UCC3972AN	TI	获取价格	VACUUM FLUOR DISPLAY DRIVER, PDIP8, PLASTIC, DIP-8
UCC3972D	TI	获取价格	FLUORESCENT LIGHT CONTROLLER, PDSO8, PLASTIC, SOIC-8
UCC3972N	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3972NG4	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3972PW	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3972PWG4	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3972PWTR	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3972PWTRG4	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3973	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC3973AN	TI	获取价格	VACUUM FLUOR DISPLAY DRIVER, PDIP8, PLASTIC, DIP-8

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