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W DESI
FOR NE RTS
ECOMM D REPLACEM
N OT R
or ISL9
R E C OM
GN S
ENDED ENT PA
MENDE 7672B
IS L97671A
4-Channel LED Driver with Phase Shift Control
ISL97675
The ISL97675 is an LED driver that drives 4 channels of low power
LEDs from 4.5V to 26V input and up to 45V output.
The ISL97675 compensates for non-uniformity of the forward voltage
drops in the LED strings with its 4 voltage controlled-current source
channels. Its headroom control monitors the highest LED forward
voltage string for output regulation, to minimize the voltage headroom
and power loss in the typical multi-string operation.
The ISL97675 offers two PWM Dimming modes: The part digitizes the
incoming 100Hz to 30kHz PWM signal and provides 8-bit PWM
dimming with phase shift function. Another mode is direct PWM
mode without phase shift, where the dimming frequency follows the
input PWM signal and the minimum on time can be as short as
350ns.
The ISL97675 features channel phase shift control to minimize the
input, output ripple characteristics and load transients as well as
spreading the light output to help eliminate or reduce the video and
audio noise interference from the backlight driver operation.
V IN * = 4.5V~26V
ISL97675
17 FAULT
19 VIN
1 VDDIO
3 FSW/Phase Shift
2 EN
20 PWM
18 COMP
13 RFPWM/DirectPWM
4 ISET
8 AGND
9 AGND
Features
? 4 x 30mA Channels
? 45V Output Max
? 4.5V to 26V Input
? Channel Phase Shift PWM Dimming with 8-bit Resolution
? 0.007% Direct PWM dimming at 200Hz
? Current Matching of ±1.5% from 1% ~ 100% Dimming
? Dynamic Headroom Control
? Protections
- String Open/Short Circuit, V OUT Short Circuit Overvoltage, and
Over-temperature Protections
- Optional Master Fault Protection
? Selectable 600kHz or 1.2MHz Switching Frequency
? 20 Ld QFN 4mmx4mm Package
Applications
? Netbook Displays LED Backlighting
? Notebook Displays LED Backlighting
V OUT = 45V max*
I LED = 30mA PER STRING
SW 16
OVP 14
PGND 15
FB1 12
FB2 11
FB3 7
FB4 6
* V IN ≥ 6V
FIGURE 1. TYPICAL APPLICATION CIRCUIT
September 14, 2011
FN7630.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2010, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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