UCC2973PW ,BiCMOS Cold Cathode Fluorescent Lamp Driver ControllerELECTRICAL CHARACTERISTICS:Unless otherwise specified these specifications hold for T =0°C to +70°C ..
UCC2973PW ,BiCMOS Cold Cathode Fluorescent Lamp Driver ControllerFEATURES DESCRIPTION• 1mA Typical Supply Current Design goals for a Cold Cathode Fluorescent Lamp ( ..
UCC2973PW ,BiCMOS Cold Cathode Fluorescent Lamp Driver ControllerMAXIMUM RATINGSVBAT..... +27VTSSOP-8 (TOP VIEW)VDD Maximum Forced Current .. 30mAPW PackageMaximum ..
UCC2973PWG4 ,BiCMOS Cold Cathode Fluorescent Lamp Driver Controller 8-TSSOP -40 to 85features as a feedback controlled PWM driver stage, open lamp pro-• PWM Frequency Synchronized tote ..
UCC2973PWTR ,BiCMOS Cold Cathode Fluorescent Lamp Driver ControllerELECTRICAL CHARACTERISTICS:Unless otherwise specified these specifications hold for T =0°C to +70°C ..
UCC2976PW , MULTI TOPOLOGY PIEZOELECTRIC TRANSFORMER CONTROLLER
UPA2001 ,Silicon transistor arrayTRANSISTOR ARRAY-
pPA2001 C41PAZOOZC,/1PA2003C,/1PAZOO4C
NPN SILICON EPITAXIAL DARLINGTON TRANS ..
UPA2001C ,Silicon transistor arrayTRANSISTOR ARRAY-
pPA2001 C41PAZOOZC,/1PA2003C,/1PAZOO4C
NPN SILICON EPITAXIAL DARLINGTON TRANS ..
UPA2001GR ,Silicon transistor arrayTRANSISTOR ARRAY-
pPA2001 C41PAZOOZC,/1PA2003C,/1PAZOO4C
NPN SILICON EPITAXIAL DARLINGTON TRANS ..
UPA2002 ,Silicon transistor arrayTRANSISTOR ARRAY-
pPA2001 C41PAZOOZC,/1PA2003C,/1PAZOO4C
NPN SILICON EPITAXIAL DARLINGTON TRANS ..
UPA2002C ,Silicon transistor arrayFEATURES
0 Transient Protected Outputs
0 High DC Current Gain ‘
High Output Drive Current
..
UPA2003 ,Silicon transistor arrayFEATURES
0 Transient Protected Outputs
0 High DC Current Gain ‘
High Output Drive Current
..
UCC2973PW-UCC2973PWG4-UCC2973PWTR
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
UCC1972/3
UCC2972/3
UCC3972/3
DESCRIPTIONDesign goals fora Cold Cathode Fluorescent Lamp (CCFL) converter useda notebook computeror portable application include small size, high effi-
ciency, and low cost. The UCC3972/3 CCFL controllers provide the neces-
sary circuit blocksto implementa highly efficient CCFL backlight power
supplyina small footprint8 pin TSSOP package. The BiCMOS controllers
typically consume less than 1mAof operating current, improving overall
system efficiency when comparedto bipolar controllers requiring 5mAto
10mAof operating current.
External parts countis minimized and system costis reducedby integrating
such featuresasa feedback controlled PWM driver stage, open lamp pro-
tection, startup delay and synchronization circuitry between the buck and
push-pull stages. The UCC3972/3 include an internal shunt regulator, al-
lowing the partto operate with input voltages from 4.5Vupto 25V. The part
supports both analog and externally generated low frequency dimming
modesof operation.
The UCC3973 addsa programmable voltage clampat the BUCK pin. This
feature can be usedto protect the transformer from overvoltage during
startupor when an open lamp occurs. Transformer voltageis controlledby
reducing duty cycle whenan over-voltageis detected.
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller
FEATURES 1mA Typical Supply Current Accurate Lamp Current Control Analogor Low Frequency Dimming
Capability Open Lamp Protection Programmable Startup Delay 4.5Vto 25V Operation PWM Frequency Synchronizedto
External Resonant Tank8 Pin TSSOP and SOIC Packages
Available Internal Voltage Clamp Protects
Transformer from Over-voltage
(UCC3973)
TYPICAL APPLICATION CIRCUIT
