Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
?
?


( File format: PDF, 465 KB )
BiCMOS Cold Cathode Fluorescent Lamp Driver Controller (Rev. C)
Texas Instruments

Description
Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used in a notebook computer or portable application include small size, high efficiency, and low cost. The UCC3972/3 CCFL controllers provide the necessary 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 integrating 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.
Features
1mA Typical Supply Current Accurate Lamp Current Control Analog or Low Frequency Dimming Capability Open Lamp Protection Programmable Startup Delay 4.5V to 25V Operation PWM Frequency Synchronized to External Resonant Tank 8 Pin TSSOP and SOIC Packages Available Internal Voltage Clamp Protects Transformer from Over-voltage (UCC3973)

Related Datasheets
Part Number Description Category
? ?PTH08T260W 3-A, 4.5-V to 14-V Input, Non-Isolated, Wide-Output, Adjustable Power Module wit (Rev. A) ICs, Interface
? ?REF5020 Low-Noise, Very Low Drift, Precision Voltage Reference ICs, Interface
? ?TPS5420 2-A Wide Input Range Step-Down Swift(TM) Converter (Rev. C) ICs, Interface
? ?TPS5420-Q1 2-A Wide-Input-Range Step-Down SWIFT(tm) Converter Power Supplies, Batteries and Accessories
? ?TPS68000 Highly Efficient Phase Shift Full Bridge CCFL Controller (Rev. A) ICs, Interface
? ?UCC28600 UCC28600 QUASI-RESONANT FLYBACK CONTROLLER (Rev. F) ICs, Interface
? ?UCC2972 BiCMOS Cold Cathode Fluorescent Lamp Driver Controller (Rev. C) ICs, Interface
? ?UCC2973 BiCMOS Cold Cathode Fluorescent Lamp Driver Controller (Rev. C) ICs, Interface
? ?UCC2975 Multi-topology Piezoelectric (Rev. A) ICs, Interface
? ?UCC3973 BiCMOS Cold Cathode Fluorescent Lamp Driver Controller (Rev. C) ICs, Interface
? ?UCC3974 Dual Cold Cathode Fluorescent Lamp Controller (Rev. A) ICs, Interface



As the hyperlinked contents/websites are those of third parties, we cannot vouch for their accuracy or legitimacy.
Interviews & Viewpoints

Talk

Learn how senior executives are seeing the industry from interviews and contributed opinions.

Bloggers Say

Bloggers Say

See what engineers like you are posting on our pages.

?
?
Back to Top