TPS61196PWPR Texas Instruments 6 String 400mA LED Lighting Driver

1 Features The TPS61196 supports direct PWM brightness dimming. Each string has an independent PWM 1• 8-V to 30-V Input Voltage control input. During the PWM dimming, the LED • Up to 120-V Output Voltage current is turned on or turned off at the frequency and • 100-KHz duty cycle which are determined by the external to 800-kHz Programmable Switching Frequency PWM signal. The PWM frequency ranges from 90 Hz to 22 kHz. • Adaptive Boost Output for LED Voltages The device integrates overcurrent protection, output • Six Current Sinks, 200-mA Continuous Output, short-circuit protection, ISET short-to-ground 400-mA Pulse Output for Each String protection, diode open and short protection, LED • ±1.5% Current Matching Between Strings open and short protection, and overtemperature • High Precision PWM Dimming Resolution up to shutdown circuit. In addition, the TPS61196 can 5000:1 detect the IFB pin short to ground to protect the LED string. The device also provides programmable input • Programmable Overvoltage Threshold at Output undervoltage lockout threshold and output and Each Current Sink overvoltage protection threshold. • Programmable Undervoltage Threshold at Input with Adjustable Hysteresis The TPS61196 has a built-in linear regulator which steps down the input voltage to the VDD voltage for • Adjustable Soft Start Time Independent of powering the internal circuitry. An soft-start circuit is Dimming Duty Cycle implemented internally to work with an external • Built-in LED Open and LED Short Protection capacitor to adjust the soft start-up time to minimize the in-rush current during boost converter start-up. • Built-in Schottky Diode Open/Short Protection The device is available in a 28-pin HTSSOP package • Built-in ISET Short Protection with PowerPAD™. • Built-in IFB Short Protection Device Information(1) • Thermal Shutdown

2. Description The TPS61196 provides a highly integrated solution for LCD TV backlight with an independent PWM dimming function for each string. This device is a current mode boost controller driving up to six WLED strings with multiple LEDs in series. Each string has an independent current regulator providing a LED current adjustable from 50 mA to 400 mA within ±1.5% matching accuracy. The minimal voltage at the current sink is programmable in the range of 0.3 V to 1 V to fit with different LED current settings. The input voltage range for the device is from 8 V to 30 V. The device adjusts the boost controller's output voltage automatically to provide only the voltage required by the LED string with the largest forward voltage drop plus the minimum required voltage at that string's IFB pin, thereby optimizing driver efficiency. Its switching frequency is programmed by an external resistor from 100 kHz to 800 kHz.

3.Pin Configuration and Functions

4.Overview The TPS61196 provides a highly integrated solution for LCD TV backlight with an independent PWM dimming function for each string. This device is a current mode boost controller driving up to six WLED strings with multiple LEDs in series. Each string has an independent current regulator providing a LED current adjustable from 50 mA to 400 mA within ±1.5% matching accuracy. The minimal voltage at the current sink is programmable in the range of 0.3 V to 1 V to fit with different LED current settings. The input voltage range for the device is from 8 V to 30 V

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