TPS61195 Datasheet, PDF (1/27 Pages) Texas Instruments – TPS61195 WLED Driver for LCD Backlighting With PWM and SMBus Control Interface

TPS61195
www.ti.com
SLVSA07 – MAY 2010
TPS61195 WLED Driver for LCD Backlighting With PWM and SMBus Control Interface
Check for Samples: TPS61195
FEATURES
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• 4.5V to 21V Input Voltage
• Integrated 2.5A 50V MOSFET
• 600kHz to 1MHz Programmable Switching
Frequency
• Adaptive Boost Output for Best Efficiency
• Designed to Use Small L-C Components
• Internal Loop Compensation
• Eight Current Sinks of 30mA
• Support up to Total 96 LEDs
• 1% Current Matching
• PWM and SMBus Brightness Interface
• 8-bits (256 steps) Brightness Level
• Programmable Over Voltage Threshold
• Built-in WLED Open/Short Protection
• Over Thermal Protection
• 28L 4×4 QFN
APPLICATIONS
• Notebook/Netbook LCD Display Backlighting
DESCRIPTION
The TPS61195 IC provides highly integrated solutions for large-size LCD backlighting. This device has a built-in
high efficiency boost regulator with integrated 2.5A/50V power MOSFET. The eight current sink regulators
provide high precision current regulation and matching. In total, the device can support up to 96 LEDs. Unused
sinks are disabled by tying them to ground. The boost output automatically adjusts its voltage to the WLED
forward voltage to improve efficiency.
The TPS61195 supports multiple brightness dimming methods. During PWM dimming, each IFB pin’s current is
turned on/off at the duty cycle and frequency determined by an integrated pulse width modulation (PWM). The
frequency of this signal is resistor programmable, while the duty cycle is controlled directly either from an
external PWM signal input to the DPWM pin or through the SMBUS interface. Additionally, the SMBUS interface
provides some operational reporting data such as if one or more strings have failed or if the IC is over-heating. In
direct PWM dimming mode, each IFB current is turned on/off at same duty cycle and frequency as the PWM
signal input on the DPWM pin. In analog dimming mode, the input PWM duty cycle information is translated to
analog signal to control the WLED current signal linearly over 1% to 100% brightness area.
The TPS61195 integrates over-current and short-circuit protection, soft start and over temperature protection
circuit. The device also provides programmable output over-voltage protection, and the threshold is adjusted by
external resistor divider combination.
The TPS61195 IC has built-in linear regulator for the IC supply. The device is in a 4x4 mm QFN package.
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 © 2010, Texas Instruments Incorporated