TPS65167_07 Datasheet, PDF (1/39 Pages) Texas Instruments – Compact LCD Bias Supply for TFT-LCD TV Panels

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TPS65167
TPS65167A
SLVS760B – APRIL 2007 – REVISED OCTOBER 2007
Compact LCD Bias Supply for TFT-LCD TV Panels
FEATURES
1
•2 6 V to 14 V Input Voltage Range
• Vs Output Voltage Range up to 19 V
• Boost Converter With 3.5-A Switch Current
• Boost Converter Overvoltage Protection
• 2.5-A Step-Down Converter With 3.3-V Fixed or
Adjustable Output
• 750 kHz Fixed Switching Frequency
• 150 mA Negative Charge Pump Driver for VGL
• 50 mA Positive Charge Pump for VGH
• LDO Controller for Logic Supply
• Gate Voltage Shaping for VGH
• Temperature Sensor Output
• TPS65167 - High Voltage Stress Test Vs
and VGH
• TPS65167A - High Voltage Stress Test Vs only
• Adjustable Sequencing
• Gate Drive Signal for Isolation Switch
• Short-Circuit Protection
• Internal Soft-start
• Thermal Shutdown
• Available in 6 × 6 mm 40 Pin QFN Package
TPS65167
12 V
Boost Converter
High-Voltage Stress Test
Vs
15 V/1.7 A
Positive Charge Pump
Gate Voltage Shaping
VGH
30 V/50 mA
APPLICATIONS
• LCD TV Panel
• LCD Monitor
DESCRIPTION
The TPS65167 offers a compact power supply
solution to provide all voltages required by a LCD
panel for large size monitor and TV panel
applications running from a 12-V supply rail.
The device generates all 3 voltage rails for the TFT
LCD bias (Vs, VGL and VGH). In addition to that it
includes a step-down converter and a LDO controller
to provide two logic voltage rails. The device
incorporates a high voltage switch that can be
controlled by a logic signal from the external timing
controller (TCON). This function allows gate voltage
shaping for VGH. The device also features a high
voltage stress test where the output voltage of VGH
is set to typically 30 V and the output voltage of Vs is
programmable to any higher voltage. The high
voltage stress test is enabled by pulling the HVS pin
high. The device consists of a boost converter to
provide the source voltage Vs operating at a fixed
switching frequency of 750 kHz. A fully integrated
positive charge pump, switching automatically
between doubler and tripler mode provides an
adjustable regulated TFT gate on voltage VGH. A
negative charge pump driver provides adjustable
regulated output voltages VGL. To minimize external
components the charge pumps for VGH and VGL
operate at a fixed switching frequency of 1.5 MHz.
The device includes safety features like overvoltage
protection of the boost converter, short-circuit
protection of VGH and VGL as well as thermal
shutdown.
Negative Charge Pump
Temperature Sensor
Buck Converter
LDO Controller
VGL
–5 V/150 mA
Vtemp
Vlogic
3.3 V/2.5 A
Vaux
1.8 V/500 mA
1
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.
PowerPAD is a trademark of Texas Instruments.
2
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.
Copyright © 2007, Texas Instruments Incorporated