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ISL97671AIRZ-EVALZ

更新时间： 2024-11-14 11:13:07
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英特矽尔 - INTERSIL 驱动器
页数 文件大小 规格书
28页 1127K
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  
ISL97671A  
Features  
The ISL97671A 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 ISL97671A can drive six channels of LEDs  
from input 4.5V~26.5V to output of up to 45V. It can also operate  
from input as low as 3V to output of up to 26.5V in bootstrap  
configuration (see Figure 40).  
• 6 x 50mA Channels  
• 4.5V to 26.5V Input with Max 45V Output  
• 3V (see Figure 40) to 21V Input with Max 26.5V Output  
• PWM Dimming with Phase Shift Control  
• SMBus/I2C controlled PWM or DC Dimming  
• Direct PWM Dimming  
The ISL97671A 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.  
• PWM Dimming Linearity  
- PWM Dimming with Adjustable Dimming Freq and Duty  
Cycle Linear from 0.4% to 100% <30kHz  
The device can also be configured in Direct PWM Dimming with  
minimum dimming duty cycle of 0.007% at 200Hz.  
- Direct PWM Dimming Duty Cycle Linear from 0.007% to  
100% at 200Hz  
The ISL97671A can compensate for the non-uniformity of the forward  
voltage drops in the LED strings and Its headroom control circuit  
monitors the highest LED forward voltage string for output regulation,  
to minimize the voltage headroom and power loss in a typical  
multi-string operation.  
• Current Matching ±0.7%  
• 600kHz/1.2MHz selectable switching frequency  
• Dynamic Headroom Control  
• Fault Protection  
The ISL97671A is offered in compact and thermally efficient  
QFN-20 4mmx3mm package.  
- String Open/Short Circuit, OVP, OTP, and Optional Output  
Short Circuit Fault Protection  
• 20 Ld 4mmx3mm QFN Package  
Applications  
• Tablet PC to Notebook Displays LED Backlighting  
• LCD Monitor LED Backlighting  
• RGB LEDs or Field Sequential LED Backlighting  
Typical Application Circuits  
45V*, 6 x 50mA  
45V*, 6 x 50mA  
45V*, 6 x 50mA  
VIN = 4.5~26.5V  
VIN = 4.5~26.5V  
VIN = 4.5~26.5V  
Q1 (optional)  
Q1 (optional)  
Q1 (optional)  
ISL97671A  
FAULT  
1
ISL97671A  
ISL97671A  
1
2
4
FAULT  
1
2
FAULT  
VIN  
LX 20  
LX 20  
2
LX 20  
VIN  
VIN  
OVP  
16  
OVP  
16  
OVP  
16  
4
8
VDC  
4
VDC  
VDC  
FPWM  
PGND 19  
PGND 19  
PGND 19  
7
6
SMBCLK/SCL  
CH0  
7
6
SMBCLK/SCL  
7
6
SMBCLK/SCL  
10  
11  
12  
13  
14  
15  
CH0 10  
SMBDAT/SDA  
CH1  
SMBDAT/SDA  
CH0 10  
SMBDAT/SDA  
CH1  
CH2  
CH3  
CH4  
CH5  
11  
12  
13  
14  
15  
5
3
PWM  
CH1  
CH2  
CH3  
CH4  
CH5  
11  
12  
13  
14  
15  
5
3
PWM  
EN  
CH2  
CH3  
CH4  
CH5  
5
3
PWM  
EN  
EN  
17  
RSET  
17  
8
RSET  
17  
8
RSET  
FPWM  
*VIN > 12V  
FPWM  
COMP  
9
18  
AGND  
COMP  
*VIN > 12V  
9
18  
AGND  
*VIN > 12V  
COMP  
9
18  
AGND  
FIGURE 1A. SMBus/I2C CONTROLLED  
DIMMING  
FIGURE 1C. DIRECT PWM DIMMING  
FIGURE 1B. PWM DIMMING WITH  
ADJUSTABLE DIMMING  
FIGURE 1. ISL97671A TYPICAL APPLICATION DIAGRAMS  
March 24, 2011  
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. 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.  
1
FN7709.1  
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