1 Features
1• 8-V to 30-V Input Voltage
• Up to 120-V Output Voltage
• 100-KHz to 800-kHz Programmable Switching
Frequency
• Adaptive Boost Output for LED Voltages
• Six Current Sinks, 200-mA Continuous Output,
400-mA 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 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.
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
to 22 kHz.
The device 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 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.
The TPS61196 has a built-in linear regulator which
steps down the input voltage to the VDD voltage for powering the internal circuitry. An soft-start circuit is
implemented internally to work with an external
capacitor to adjust the soft start-up time to minimize
the in-rush current during boost converter start-up.
The device is available in a 28-pin HTSSOP package with PowerPAD™.