Datasheet > UCC1972J

UCC1972J

更新时间： 2024-11-27 23:39:03

品牌	Logo	应用领域
其他 - ETC		驱动器信息通信管理控制器
页数	文件大小	规格书
18页	268K
描述
Ballast/Backlight Controller/Driver

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中文翻译

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数据手册

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UCC1972J 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

UCC3973

VOLTAGE AT START-UP OR DURING FAULT

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

SLUS252B - OCTOBER 1998 - REVISED NOVEMBER 2000

12 3 4 5 6 7...18

中文翻译

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与UCC1972J相关器件

型号	品牌	获取价格	描述	数据表
UCC1972N	TI	获取价格	FLUORESCENT LIGHT CONTROLLER, 280kHz SWITCHING FREQ-MAX, PDIP8, DIP-8
UCC1972PW	TI	获取价格	FLUORESCENT LIGHT CONTROLLER, 280kHz SWITCHING FREQ-MAX, PDSO8, TSSOP-8
UCC1973	TI	获取价格	BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC1973N	TI	获取价格	IC,BALLAST/BACKLIGHT CONTROLLER/DRIVER,BICMOS,DIP,8PIN,PLASTIC
UCC1973PW	TI	获取价格	IC,BALLAST/BACKLIGHT CONTROLLER/DRIVER,BICMOS,TSSOP,8PIN,PLASTIC
UCC20225	TI	获取价格	具有单 PWM 输入、8V UVLO 且采用 LGA 封装的 2.5kVrms、4A/6A
UCC20225A-Q1	TI	获取价格	具有单 PWM 输入、5V UVLO 且采用 LGA 封装的汽车类 2.5kVrms、4A
UCC20225AQNPLRQ1	TI	获取价格	具有单 PWM 输入、5V UVLO 且采用 LGA 封装的汽车类 2.5kVrms、4A
UCC20225AQNPLTQ1	TI	获取价格	具有单 PWM 输入、5V UVLO 且采用 LGA 封装的汽车类 2.5kVrms、4A
UCC20225NPLR	TI	获取价格	具有单 PWM 输入、8V UVLO 且采用 LGA 封装的 2.5kVrms、4A/6A

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