DATASHEET
ISL97686 FN7953
Rev.1.00
Sep 19, 2017 4-Channel LED Driver with Independent Channel Control for Dynamic Dimming
The ISL97686 is a PWM controlled LED driver that supports
4 channels of LED current for monitor and TV LCD backlight
applications. It is capable of driving 160mA per channel from a
9V to 32V input supply, with current sources rated up to 75V
absolute maximum.
The ISL97686’s current sources achieve typical current
matching to В±1%, while dynamically maintaining the
minimum required VOUT necessary for regulation. This adaptive
scheme compensates for the non-uniformity of forward
voltage variance in the LED strings.
The ISL97686 dimming can be controlled by a high speed SPI
interface for independent channel control for dynamic
dimming function synthesized on chip at 10-bit resolution.
The ISL97686 has an advanced dynamic headroom control
function, which monitors the highest LED forward voltage
string, and regulates the output to the correct level to minimize
power loss. This proprietary regulation scheme also allows for
extremely linear PWM dimming from 0.02% to 100%. The LED
current can also be switched between two current levels, giving …