TPS61196 Datasheet | Texas Instruments

Features - 1 8-V to 30-V Input Voltage - Up to 120-V Output Voltage - 100-KHz to 800-k Hz Programmable Switching Frequency - Adaptive Boost Output for LED Voltages - Six Current Sinks, 200-m A Continuous Output, 400-m A Pulse Output for Each String - ±1.5% Current Matching Between Strings - High Precision PWM Dimming Resolution up to 5000:1 - Programmable Overvoltage Threshold at Output and Each Current Sink - Programmable Undervoltage Threshold at Input with Adjustable Hysteresis - Adjustable Soft Start Time Independent of Dimming Duty Cycle - Built-in LED Open and LED Short Protection - Built-in Schottky Diode Open/Short Protection - Built-in ISET Short Protection - Built-in IFB Short Protection - Thermal Shutdown 2 Applications - LCD TV Backlight - Scan Mode LCD TV Backlight 3 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 m A to 400 m A 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 k Hz to 800 k Hz. The TPS61196 supports direct PWM brightness dimming. Each string has an independent PWM control input. During the PWM dimming, the LED current is turned on or turned off at the frequency and duty cycle which are determined by the external PWM signal. The PWM frequency ranges from 90 Hz...