DATASHEET
ISL97687 FN7714
Rev.3.00
Sep 13, 2017 4-Channel LED Driver with Phase Shift Control and 10-Bit Dimming Resolution
The ISL97687 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 ISL97687’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 ISL97687 can decode both an incoming PWM signal and
an analog input voltage, for DC-to-PWM dimming applications.
Modes include direct PWM and several modes where the PWM
frequency is synthesized on chip at 10-bit resolution. This can
be either free running, or synchronized with the frame rate to
give both a frequency and a phase lock, minimizing panel to
panel variation and display flicker. Phase shift is supported,
reducing flicker and audio noise, as is multiplication of the
incoming decoded analog and PWM values. …