UCC2974 Datasheet

IC型號：
UCC2974
PDF描述：
DUAL COLD CATHODE FLUORESCENT LAMP CONTROLLER
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UCC2974

UCC3974

SLUS485A 鈥?JULY 2001 鈥?REVISED NOVEMBER 2001

DUAL COLD CATHODE FLUORESCENT

LAMP CONTROLLER

FEATURES

Synchronous or Nonsynchronous Operation

Dual Output and Control Stages

BiCMOS Technology

Accurate Current Control with 2-mA Typical

Supply Current

Analog or Digital Low-Frequency Dimming

Capability

Open Lamp Protection with Voltage Clamp

4.5-V to 25-V Operation

PWM Frequencies Synchronized to External

Resonant Tanks

TSSOP-16 (PW) Package

APPLICATIONS

Portable PCs

Desktop LCD Monitors

Internet Appliances

DESCRIPTION

Design goals for a cold cathode fluorescent lamp

(CCFL) converter used for a liquid crystal display

(LCD) monitor application include small size, high

efficiency, and low cost. The UCC2974/UCC3974

CCFL controllers provide the necessary circuit

blocks to implement a highly efficient LCD monitor

backlight supply in a small 16-pin TSSOP

package. The device features two control stages

for operating independent resonant tanks for

multi-lamp designs. The BiCMOS controller

typically consumes less than 2-mA of operating

current, improving overall system efficiency.

External parts count is minimized and system cost

is reduced by integrating such features as dual

PWM driver stages, open lamp protection,

overvoltage clamp, and synchronization circuitry

between the buck and push-pull stages. The

device operates in both analog and low-frequency

dimming modes.

TYPICAL APPLICATION

VIN

UCC3974

BRIGHT

OUT1

VIN

BUCK1

COMP1

FB1

DIM

OUT2 16

MIRROR CHANNEL 1

GND

BUCK2 14

CBP 13

COMP2

FB2 11

MODE

LFDSYNC

SYNC

UDG鈥?1023

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

錚?/div>

2001, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

www.ti.com

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