TPS61195

www.ti.com

SLVSA07 – MAY 2010

TPS61195 WLED Driver for LCD Backlighting With PWM and SMBus Control Interface

Check for Samples: TPS61195

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FEATURES

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PWM and SMBus Brightness Interface

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4.5V to 21V Input Voltage

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8-bits (256 steps) Brightness Level

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Integrated 2.5A 50V MOSFET

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Programmable Over Voltage Threshold

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600kHz to 1MHz Programmable Switching

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Built-in WLED Open/Short Protection

Frequency

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Over Thermal Protection

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Adaptive Boost Output for Best Efficiency

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28L 4×4 QFN

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Designed to Use Small L-C Components

APPLICATIONS

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Internal Loop Compensation

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Notebook/Netbook LCD Display Backlighting

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Eight Current Sinks of 30mA

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Support up to Total 96 LEDs

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1% Current Matching

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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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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.