UCC2973 Datasheet

IC型號(hào)：
UCC2973
PDF描述：
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
文件大小：
310.09KB
PDF頁(yè)數(shù)：
17頁(yè)
芯片廠家：
TI

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UCC1972/3

UCC2972/3

UCC3972/3

BiCMOS Cold Cathode Fluorescent Lamp Driver Controller

FEATURES

鈥?/div>

1mA Typical Supply Current

鈥?/div>

Accurate Lamp Current Control

鈥?/div>

Analog or Low Frequency Dimming

Capability

鈥?/div>

Open Lamp Protection

鈥?/div>

Programmable Startup Delay

鈥?/div>

4.5V to 25V Operation

鈥?/div>

PWM Frequency Synchronized to

External Resonant Tank

鈥?/div>

8 Pin TSSOP and SOIC Packages

Available

鈥?/div>

Internal Voltage Clamp Protects

Transformer from Over-voltage

(UCC3973)

DESCRIPTION

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.

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.

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.

C6 27pF

TYPICAL APPLICATION CIRCUIT

UCC3972

UCC3973

NO INTERNAL VOLTAGE CLAMP

INTERNAL VOLTAGE CLAMP LIMITS TRANSFORMER

VOLTAGE AT START-UP OR DURING FAULT

SYSTEM VOLTAGE

(4.5V TO 25V)

R2 1k

1k鈩?/div>

6.8碌F

C5 0.1碌F

UCC3972/3

R10

1碌F

VDD

VBAT

0.1碌F

R11

LAMP

GND

BUCK

1碌F

MODE

68碌H

LAMP

ANALOG

DIMMING

COMP

R6 75鈩?/div>

OUT

R3 68k

R5 10k

LOW FREQUENCY DIMMING

R4 750

C4 33nF

LFD

68k

0V-5V LOW FREQUENCY CONTROL SIGNAL

UDG-99154

SLUS252A - JANUARY 2000

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