The TPS61196-Q1 provides a highly integrated solution for automotive
LCD backlighting 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 TPS61196-Q1 adjusts the boost controllers 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.
The TPS61196-Q1 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 to 22 kHz.
The TPS61196-Q1 integrates overcurrent protection, output short-circuit protection, ISET
short-to-ground protection, diode open and short protection, LED open and short protection, and
overtemperature shutdown circuit. In addition, the TPS61196-Q1 can detect the IFB pin short to
ground to protect the LED string. The device also provides programmable input undervoltage lockout
threshold and output overvoltage protection threshold.
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