TPS68000| Datasheet

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TPS68000
(6,4 mm x 7,8 mm)

www.ti.com

SLVS524A OCTOBER 2005 REVISED FEBRUARY 2006

HIGHLY EFFICIENT PHASE SHIFT FULL BRIDGE CCFL CONTROLLER
FEATURES
8-V to 30-V Input Voltage Range Full Bridge Topology With Integrated Gate Drives for 4 NMOS Switches Synchronizable Constant Frequency Operation Programmable Phase Delays of Operating Frequency for Master-Slave Operation Lamp Voltage and Lamp Current Regulation Analog and Burst Dimming Configurable Distributed Burst Dimming in Multiple Controller Applications Programmable Voltage Regulation Timeout for Startup and Fault Conditions Open-Lamp and Short-Circuit Protection Internal Over-Temperature Protection Undervoltage Lockout 30-pin TSSOP Package

DESCRIPTION
The TPS68000 device provides a power supply controller solution for CCFL backlight applications in a large variety of applications. The wide input voltage range of 8 V to 30 V makes it suitable to be powered directly from regulated 12-V or 24-V rails, or any other source with output voltages in this range. When using a 10% accurate regulated 5-V rail, it also can be used in notebook computers or other portable battery-powered equipment having lower minimum supply voltages. The controller is capable of driving the gates of all 4 NMOS switches directly without the need for any additional circuitry, like dedicated gate drivers or gate-drive transformers. The wide input voltage range also makes it easy to design CCFL converters with higher input voltages like 120 V or 400 V available at the output of a power factor correction unit. The TPS68000 also supports CCFL converter circuits driving multi-lamp applications, either by using higher power-rated switches and transformers, or using several TPS68000s synchroniz
ed. When synchronized, they can be operated either at the same frequency and phase, or phase shifted to minimize RMS input current. Already implemented smart dimming features, such as support of distributed dimming, also help to optimize the performance of multi-controller applications. (Continued on next page)
C10 TPS68000 Supply Voltage 8V .. 30V VCC C1 VLOGIC R2 Error Output Synchronization Synchronization Phase Shift Operating Frequency Device Enable 0V FAULT 2.0 V R1 C5 3.3 V 0V 2V 0V C6 BBR BF BC C7 VREF GND ABR EN STC SYNC PH SET V5A GA SA V5C GC SC GB GD V5 OCP CSEN CAO CA- VSEN VAO VA- PGND C9 C4 QB C2 QD C13 R3 R4 T1 C 3

APPLICATIONS
CCFL Backlight Power Supplies for Desktop Monitors and LCD TVs CCFL Backlight Power Supplies for Notebook Computers

QC C14 C12

Lamp current (Analog Dimming Input) Burst Duty Cycle (Burst Dimming Input) Burst Frequency Direct Burst Dimming Input (Frequency + Duty Cycle)

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. Distributed Dimming is a registered trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.