TPS65166 Datasheet, PDF (1/41 Pages) Texas Instruments – Compact LCD Bias Supply for TFT-LCD TV Panels

TPS65166
www.ti.com.......................................................................................................................................................................................... SLVS976 – SEPTEMBER 2009
Compact LCD Bias Supply for TFT-LCD TV Panels
FEATURES
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•2 8.5V to 14.7V Input Voltage Range
• V_S Output Voltage Range up to 19V
• Boost Converter with 4.2A Switch Current
• Step Down Converter with 2.6A Switch Current
and Adjustable Output 2.5V to 3.3V
• 750kHz Fixed Switching Frequency
• Temperature Compensated Negative Supply
• High Voltage Stress Test (HVS)
• Adjustable Sequencing
• Gate Drive Signal for Isolation Switch
• Short Circuit Protection
• Internal Soft-Start
• 180° Phase Shift Between Buck and Boost
• P2P Short/Open Certified
• Optimized Dual Layer PCB Layout
• Low EMI
• Undervoltage Lockout
• Thermal Shutdown
• Available in 6×6mm 40 Pin QFN Package
TYPICAL APPLICATION
V_in
Boost
12 V
Converter
With HVS
Buck
Converter
Positive
Charge
Pump
Inverting Buck Boost
With
Temperature
Compensation
Negative Shunt
Regulator
Sequencing
And Logic
V_s
15V / 2.9A
V_logic
3.3V / 2.4A
V_ONE
28V / 150mA
V_OFFE
-22 to -11V / 200mA
V_ss
-7.5V / 100mA
Power Good
APPLICATIONS
• LCD TV Panel with ASG Technology
DESCRIPTION
The TPS65166 offers a compact power supply
solution to provide all voltages required by a LCD
panel for large TV panel applications running from a
12V supply rail. The device is optimized to support
LCD technology using ASG gate drive circuits.
The device generates all voltage rails for the TFT
LCD bias (V_S, V_ONE, V_OFFE, V_SS). In addition to that it
includes a step-down converter (V_logic) to provide the
logic voltage. By pulling the HVS pin high an
implemented high voltage stress test feature
programs the boost converter output voltage V_s to
higher values. The boost converter operates at a
fixed switching frequency of 750kHz. The positive
charge pump is running from the boost converter and
is regulated by an external transistor. A buck-boost
converter provides an adjustable temperature
dependent negative output voltage V_OFFE. The
negative output voltage V_SS is regulated by a shunt
regulator.
Safety features like overvoltage protection of the
buck-boost input voltage, the boost and buck output
voltage, undervoltage lockout, short circuit protection
of V_ONE, V_OFFE, and V_logic are included as well as
thermal shutdown.
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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.
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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 © 2009, Texas Instruments Incorporated