DATASHEET
ISL97672B FN7995
Rev.3.00
Sep 7, 2017 6-Channel LED Driver with Ultra Low Dimming Capability
The ISL97672B is an integrated 6-channel power LED driver for
LCD backlight applications. The ISL97672B is capable of
driving LEDs with an input from 4.5V to 26.5V and a maximum
output up to 45V. Features The ISL97672B employs an adaptive boost switching
architecture that allows direct PWM dimming with dimming
duty cycle as low as 0.007% at 200Hz or 0.8% at 20kHz. PWM
Dimming frequency can be as high as 30kHz. 45V output maximum The ISL97672B employs dynamic headroom control that
monitors the highest LED forward voltage string for output
regulation to minimize headroom voltage and power loss in a
typical multi-string operation. Typical current matching
between channels is В±0.7%.
The ISL97672B incorporates extensive protection functions
that flag whenever a fault occurs. The protections include
string-open and short-circuit detections, OVP, OTP, and an
optional output short-circuit protection with external fault
disconnect switch. 6 x 50mA channels 4.5V to 26.5V input Adaptive boost switching architecture Direct PWM dimming with dimming linearity of
0.007%~100% at 200Hz or 0.8%~100% <20kHz Adjustable 200kHz to 1.4MHz switching frequency Dynamic headroom control Fault protections with latched flag indication
-String open/short-circuit
-Overvoltage Protection (OVP) …