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8-Channel 45V 50mA LED Driver
ISL97678
The ISL97678 is an 8-channel PWM dimming LED driver
for LCD backlight applications. The ISL97678 is capable
of driving up to 96 pieces of 3.4V/50mA LEDs but larger
numbers of LEDs is possible if the LED forward voltage
combined is less than 45V. The ISL97678 has 8 channels
of voltage controlled current sources with typical currents
matching to ±1%, which compensate for the
non-uniformity effect of forward voltages variance in the
LED strings. To minimize the voltage headroom and
power loss in the typical multi-string operation, the
ISL97678 features dynamic headroom control that
monitors the highest LED forward voltage string and uses
its feedback signal for output regulation.
The ISL97678 features PWM dimming up to 30kHz with
0.8%~100% duty cycle and maintains ±1% current
matching across all ranges. The PWM dimming frequency
can be adjusted between 100Hz and 30kHz. The boost
switching frequency can also be adjusted between
600kHz and 1.5MHz.
The ISL97678 features extensive protection functions
that include string open and short circuit detections, OVP,
and OTP.
ISL97678 is available in the 32 Leads QFN 5mmx5mm
and operate from -40°C to +85°C with input voltage
ranges from 4.75V to 26V.
Features
? 8 Channels
? 4.75V ~ 26V Input
? 45V Maximum Output
? Drive Typically 96 LEDs (3.4V/50mA each)
? External PWM Input up to 25kHz Dimming
? Dimming range 0.8%~100% up to 30kHz
? Current Matching ±0.7%
? Protections
- String Open Circuit and Short Circuit Detections,
OVP, and OTP
? Adjustable Dimming Frequency
? Adjustable Switching Frequency
? 32 Ld (5mmx5mm) QFN Package
Applications
? Notebook Displays WLED or RGB LED Backlighting
? LCD Monitor LED Backlighting
November 5, 2009
FN6998.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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