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NOT REC
DED FOR
RECOMM
EN DED R NEW DE
EP L ACE
ISL9767
1A or ISL
OMMEN
SIGNS
MENT PA RT
97672B
6-Channel SMBus/I 2 C or PWM Dimming LED Driver with
Phase Shift Control
ISL97671
The ISL97671 is a 6-Channel 45V dual dimming capable LED
driver that can be used with either SMBus/I 2 C or PWM signal for
dimming control. The ISL97671 drives 6 channels of LED to
support 78 LEDs from 4.5V to 26V or 48 LEDs from a boost
supply of 2.7V to 26V and a separate 5V bias on the ISL97671
VIN pin.
The ISL97671 compensates for non-uniformity of the forward voltage
drops in the LED strings with its 6 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 a typical multi-string operation.
The ISL97671 features optional channel phase shift control to
minimize the input, output ripple characteristics and load
transients as well as spreading the light output to help reduce
the video and audio interference from the backlight driver
operation. The phase shift can be programmed with equal phase
angle or adjustable in 7-bit resolution.
The ISL97671 has a full range of dimming capabilities that
include SMBus/I 2 C controlled PWM dimming or DC dimming. It
can also do direct PWM dimming with as low as 350ns pulse on
PWM pin, which translates to a duty-cycle of 0.007% at a 200Hz
dimming frequency.
Related Literature
? See AN1581 , “ISL97671/2/3/4IRZ-EVAL Quick Start Guide”
V IN = 4.5~26.5V
ISL97671
1 FAULT
2 VIN
4 VDC
Features
? 6 Channels
? 4.5V to 26.5V Input
? 45V Output Max
? Up to 40mA LED Current per Channel
? Extensive Dimming Control
- PWM/DPST Dimming, I 2 C 8-bit with Equal Phase Shift, and
0.007% Direct PWM Dimming at 200Hz
? Optional Master Fault Protection
? PWM Dimming Linearity 0.4%~100% <30kHz
? 600kHz/1.2MHz Selectable Switching Frequency
? Dynamic Headroom Control
? Protections with Flag Indication
- String Open/Short Circuit, V OUT Short Circuit, Overvoltage
and Over-Temperature Protections
- Optional Master Fault Protection
? Current Matching ±0.7%
? 20 Ld 4mmx3mm QFN Package
Applications
? Notebook Displays WLED or RGB LED Backlighting
? LCD Monitor LED Backlighting
? Automotive Displays LED Backlighting
? Automotive or Traffic Lighting
V OUT = 45V*, 40mA PER STRING
LX 20
OVP 16
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA
5 PWM
3 EN
17 RSET
CH0 10
CH1 11
CH2 12
CH3 13
CH4 14
8 FPWM
9 AGND
CH5 15
COMP 18
*V IN > 12V
FIGURE 1. ISL97671 TYPICAL APPLICATION DIAGRAM WITH SMBus/I 2 C CONTROL
August 14, 2012
FN7631.3
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. 2010-2012. 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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