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ISL97671

更新时间： 2024-11-14 11:47:11
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英特矽尔 - INTERSIL 驱动器
页数 文件大小 规格书
28页 621K
描述
6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control

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6-Channel SMBus/I2C or PWM Dimming LED Driver  
with Phase Shift Control  
ISL97671  
Features  
• 6 Channels  
The ISL97671 is a 6-Channel 45V dual dimming capable  
LED driver that can be used with either SMBus/I2C 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.  
• 4.5V to 26.5V Input  
• 45V Output Max  
• Up to 40mA LED Current per channel  
• Extensive Dimming Control  
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.  
- PWM/DPST Dimming, I2C 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  
The ISL97671 features optional channel phase shift  
control to minimize the input, output ripple  
• Protections with Flag Indication  
- String Open/Short Circuit, VOUT Short Circuit,  
Overvoltage and Over-Temperature Protections  
- Optional Master Fault Protection  
• Current Matching ±0.7%  
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.  
• 20 Ld 4mmx3mm QFN Package  
The ISL97671 has a full range of dimming capabilities  
that include SMBus/I2C 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.  
Applications*(see page 27)  
• Notebook Displays WLED or RGB LED Backlighting  
• LCD Monitor LED Backlighting  
• Automotive Displays LED Backlighting  
• Automotive or Traffic Lighting  
Typical Application Circuit  
V
= 45V*, 40mA PER STRING  
OUT  
V
= 4.5~26.5V  
IN  
ISL97671  
FAULT  
1
2
LX 20  
VIN  
VDC  
OVP  
16  
4
PGND 19  
7
6
SMBCLK/SCL  
CH0 10  
SMBDAT/SDA  
CH1  
CH2  
CH3  
CH4  
CH5  
11  
12  
13  
14  
15  
5
3
PWM  
EN  
17  
8
RSET  
FPWM  
*V > 12V  
IN  
COMP  
9
18  
AGND  
FIGURE 1. ISL97671 TYPICAL APPLICATION DIAGRAM WITH SMBus/I2C CONTROL  
June 24, 2010  
FN7631.0  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright Intersil Americas Inc. 2010. All Rights Reserved  
All other trademarks mentioned are the property of their respective owners.  
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