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ISL97671A

更新时间： 2024-11-15 14:57:35
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28页 1583K
描述
6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control

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DATASHEET  
ISL97671A  
FN7709  
Rev.4.00  
Sep 14, 2017  
6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control  
The ISL97671A is a 6-Channel 45V dual dimming capable LED  
Features  
driver that can be used with either SMBus/I2C or PWM signal  
• 6 x 50mA channels  
for dimming control. The ISL97671A can drive six channels of  
LEDs from an input of 4.5V~26.5V to an output of up to 45V. It  
can also operate from an input as low as 3V to an output of up  
to 26.5V in bootstrap configuration (refer to Figure 38 on  
page 26).  
• 4.5V to 26.5V input with 45V maximum output  
• 3V (see Figure 38 on page 26) to 21V input with 26.5V  
maximum 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 to improve efficiency and eliminate audible noise.  
• PWM dimming linearity  
The device can also be configured for Direct PWM Dimming  
with a minimum dimming duty cycle of 0.007% at 200Hz.  
- PWM dimming with adjustable dimming frequency and  
duty cycle linear from 0.4% to 100% <30kHz  
The ISL97671A 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.  
- Direct PWM dimming duty cycle linear from 0.007% to  
100% at 200Hz  
• Current matching ±0.7%  
The ISL97671A is offered in a compact and thermally efficient  
20 Ld QFN 4mmx3mm package.  
• 600kHz/1.2MHz selectable switching frequency  
• Dynamic headroom control  
• Fault protection  
Related Literature  
• For a full list of related documents, visit our website  
- ISL97671A product page  
- 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  
• Field sequential RGB 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  
1 FAULT  
ISL97671A  
FAULT  
ISL97671A  
1
2
4
FAULT  
VIN  
1
2
LX 20  
LX 20  
LX 20  
2
VIN  
VIN  
OVP  
OVP  
16  
OVP  
16  
16  
4
8
4
VDC  
VDC  
VDC  
FPWM  
PGND 19  
PGND 19  
PGND 19  
CH0 10  
7
6
7
6
SMBCLK/SCL  
SMBDAT/SDA  
7
6
SMBCLK/SCL  
SMBCLK/SCL  
SMBDAT/SDA  
CH0  
10  
11  
12  
13  
14  
15  
CH0 10  
SMBDAT/SDA  
CH1  
CH2  
CH3  
CH4  
CH5  
CH1  
CH2  
CH3  
CH4  
CH5  
CH1  
CH2  
CH3  
CH4  
CH5  
11  
12  
13  
14  
15  
11  
12  
13  
14  
15  
5
3
PWM  
EN  
5
3
PWM  
EN  
5
3
PWM  
EN  
17  
RSET  
17  
8
17  
8
RSET  
RSET  
FPWM  
FPWM  
*VIN > 12V  
COMP  
*VIN > 12V  
9
18  
AGND  
COMP  
*VIN > 12V  
COMP  
9
18  
9
18  
AGND  
AGND  
FIGURE 1A. SMBus/I2C CONTROLLED  
DIMMING AND ADJUSTABLE  
DIMMING FREQUENCY  
FIGURE 1B. PWM DIMMING WITH PWM INPUT  
AND ADJUSTABLE DIMMING  
FREQUENCY  
FIGURE 1C. DIRECT PWM DIMMING  
FIGURE 1. ISL97671A TYPICAL APPLICATION DIAGRAMS  
FN7709 Rev.4.00  
Sep 14, 2017  
Page 1 of 28  
1234567...28

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