The TPS61187 device provides a highly integrated white-light-emitting-diode (WLED) driver
solution for notebook LCD backlight. This device has a built-in high efficiency boost regulator
with integrated 2-A, 40-V power MOSFET. The six current sink regulators provide high precision
current regulation and matching. In total, the device can support up to 60 WLEDs. In addition, the
boost output automatically adjusts its voltage to the WLED forward voltage to optimize efficiency.
The TPS61187 supports the automatic phase-shift-dimming method and direct-PWM-dimming
method. During phase-shift-PWM dimming, the WLED current is turned on and turned off at the duty
cycle controlled by the input PWM signal, and each channel is shifted according to the frequency
determined by an integrated pulse-width-modulation (PWM) signal. The frequency of this signal is
resistor programmable, while the duty cycle is controlled directly from an external PWM signal
input to the PWM pin. During direct PWM dimming, the WLED current is turned on and/or turned off
synchronized with the input PWM signal.
For all available packages, see the orderable addendum at the
end of the data sheet.
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