Datasheet Intersil ISL97901CRZ-T — Даташит

DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl97901 ISL97901 FN7824
Rev 0.00
June 29, 2012 RGB Buck-Boost Four-Channel LED Driver with Color Sequencing and Automatic
White Balance Features The ISL97901 is a highly efficient four channel, 1.5A
sequential LED driver powered from a single-cell Li-ion battery,
or regulated input voltage up to 5.5V. The ISL97901
incorporates an independent current controlled driving
mechanism for each of the LED's to allow accurate brightness
control. Buck-Boost Based LED Driver RGB, RGGB or RGBW Color Sequencing Up to 1.5A Output Current Photo Detector Feedback Interface The ISL97901 also utilizes a buck-boost converter to ensure
optimum output voltage is maintained for a wide variety of
LED forward voltages. The ISL97901's highly integrated and
efficient power conversion core operates at well over 90%
efficiency across a wide range of operating conditions. The
power conversion core implements a proprietary algorithm
that allows seamless transitions and glitch-free operation
between the buck and the boost modes as the battery voltage
drops during operation. Dual Green LED Drive Support Closed-Loop White Balancing Dynamic Current Scaling Standby Current less than 70ВµA I2C Interface 150mV Feedback Voltage Reference for Current Regulation
to Maximize Efficiency 2.5MHz Switching Frequency The ISL97901 provides I/O pins to interface with Intersil's
optical sensor IC's for white balance control. White balance is
achieved by closing the opto-electrical loop which allows for
LED light output to get calibrated against preset target values.
The ISL97901 can also be configured to run in an open-loop …