BUF07703_16 Datasheet, PDF (18/32 Pages) Texas Instruments – Multi-Channel LCD Gamma Correction Buffer

BUF07703
BUF06703
BUF05703
SBOS269C – MARCH 2003 – REVISED APRIL 2010
COMPLETE LCD SOLUTION FROM TI
Besides the BUFxx703 line of gamma correction
buffers, TI offers a complete set of ICs for the LCD
panel market: source and gate drivers, various
power-supply solutions, as well audio power
solutions. Figure 41 shows the total IC solution from
TI.
Audio Power Amplifier for TV Speakers
The TPA3002D2 is a 7W (per channel) stereo audio
amplifier specifically targeted towards LCD monitors
and TVs. It offers highly efficient, filter-free Class-D
operation for driving bridged tied stereo speakers.
The TPA3002D2 is designed to drive stereo speakers
as low as 8Ω without an output filter. The high
efficiency of the TPA3002D2 eliminates the need for
external heatsinks when playing music. Stereo
speaker volume is controlled with a dc voltage
applied to the volume control terminal offering a
range of gain from −40dB to +36dB. Line outputs, for
driving external headphone amplifier inputs, are also
dc voltage controlled with a range of gain from −56dB
to +20dB. An integrated +5V regulated supply is
provided for powering an external headphone
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amplifier. Texas Instruments offers a full line of linear
and switch-mode audio power amplifiers. For
excellent audio performance TI recommends the
OPA364 or OPA353 as headphone drivers. For more
information visit www.ti.com.
Integrated DC/DC Converter for LCD Panels:
TPS65100
The TPS65100 offers a very compact and small
power supply solution to provide all three
power-supply voltages required by TFT (thin film
transistor) LCD displays. Additionally the device has
an integrated V_COM buffer. The auxiliary linear
regulator controller can be used to generate the 3.3V
logic power rail for systems powered by a 5V supply
rail only. The main output can power the LCD source
drivers as well as the BUFxx703. An integrated
adjustable charge pump doubler/tripler provides the
positive LCD gate drive voltage. An externally
adjustable negative charge pump provides the
negative gate drive voltage. The TPS65100 has an
integrated V_COM buffer to power the LCD backplane.
A version of the BUFxx703 without the integrated
V_COM buffer could be used for minimum redundancy
and lowest cost. For LCD panels powered by 5V only,
the TPS65100 has a linear regulator controller that
uses an external transistor to provide a regulated
3.3V output for the digital circuits. Contact the local
sales office for more information.
2.7V to 5V
TPA3002
Audio
Speaker
Driver
TPS65100
LCD
Supply
+15V
+30V
-12V
3.3V
Reference
Gamma Correction
BUFxx702
n
n
Source Driver
Logic and
Timing
Controller
High-Resolution
TFT-LCD Panel
V_COM
Figure 41. TI LCD Solution
18
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