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ISL78171

更新时间： 2024-11-26 01:15:15
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瑞萨 - RENESAS /
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29页 1475K
描述
6-Channel, 50mA Automotive LED Driver with Ultra-High Dimming Ratio and Phase Shift Control

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DATASHEET  
ISL78171  
FN8602  
Rev.1.00  
Oct 20, 2017  
6-Channel, 50mA Automotive LED Driver with Ultra-High Dimming Ratio and  
Phase Shift Control  
The ISL78171 is a 6-channel, 50mA, LED driver capable of very  
Features  
high dynamic range dimming. It offers an integrated boost  
• 6 channels at 50mA maximum per channel  
converter, six high precision, adjustable current sinks and a  
SMBus/I2C interface for digital programmability and extensive  
diagnostics. These features provide the ISL78171 with the  
capabilities to design a compact, highly versatile LED backlight  
for a wide variety of ambient lighting conditions.  
• Input voltage: 4.5V to 26.5V, output voltage: 40V max  
• Bootstrap operation Input:3V to 21V output: 26.5V max  
• PWM dimming with phase shift control  
• SMBus/I2C controlled PWM or DC dimming  
• Direct PWM dimming  
The integrated peak current mode PWM boost converter  
operates with a constant frequency and can boost an input  
voltage range of 4.5V - 26.5V to an output up to 40V and supply  
six strings of LEDs with up to 50mA each. A dynamic headroom  
control circuit detects and regulates the highest voltage string to  
improve efficiency in multistring configurations.  
• Internal PWM dimming mode linearity: 0.4% to 100%,  
dimming frequency <30kHz  
• Direct PWM dimming duty cycle linearity: 0.007% to 100%  
at a dimming frequency of 200Hz  
The six high precision adjustable current sinks offer typical  
current matching better than ±1% and a dimming ratio  
capable of exceeding 60,000:1. The dimming ratio can be  
adjusted with either or both the I2C/SMBus and an external  
PWM signal. They also feature an optional channel phase shift  
control which helps to reduce the input and output  
capacitance and ripple, to improve efficiency and to prevent  
audible noise.  
• Current matching ±0.7% typ  
• 600kHz/800kHz/1.2MHz selectable switching frequency  
• Dynamic headroom control  
• Fault protection  
- String open/short-circuit, OVP, OTP and optional output  
short-circuit fault protection  
The SMBus/I2C interface offers a wide range of  
• AEC-Q100 qualified  
programmability that includes the boost FET slew rate control,  
individual string enabling, and converter switching frequency  
selections. It offers a wide range of protection features and  
diagnostics that cover all perceivable faults, enabling the  
system to self-diagnose the functioning of the backlight and  
react to such conditions as failed LEDs. The ISL78171 is offered  
in a compact and thermally efficient 20 Ld QFN package with an  
ambient temperature range of -40°C to +105°C.  
Applications  
• Infotainment display LED backlighting  
• LCD monitor LED backlighting  
• Field sequential RGB LED backlighting  
Related Literature  
• For a full list of related documents, visit our website  
- ISL78171 product page  
40V, 6 x 50mA*  
40V, 6 x 50mA*  
40V, 6 x 50mA*  
VIN = 4.5~26.5V  
VIN = 4.5~26.5V  
VIN = 4.5~26.5V  
Q1 (OPTIONAL)  
ISL78171  
Q1 (OPTIONAL)  
Q1 (OPTIONAL)  
ISL78171  
1 FAULT  
ISL78171  
FAULT  
1
2
4
FAULT  
1
2
LX 20  
LX  
LX 20  
20  
16  
VIN  
VIN  
VIN  
2
4
OVP  
OVP  
OVP  
16  
16  
4
8
VDC  
VDC  
VDC  
FPWM  
PGND  
19  
PGND  
PGND 19  
CH0 10  
19  
7
6
SMBCLK/SCL  
SMBDAT/SDA  
7
6
7
6
SMBCLK/SCL  
SMBCLK/SCL  
SMBDAT/SDA  
CH0  
CH1  
10  
11  
CH0 10  
SMBDAT/SDA  
CH1  
CH2  
CH3  
CH4  
CH5  
CH1  
CH2  
CH3  
CH4  
CH5  
11  
12  
13  
14  
15  
11  
12  
13  
14  
15  
PWM  
EN  
5
3
5
3
PWM  
EN  
5
3
PWM  
EN  
CH2 12  
CH3 13  
CH4 14  
CH5 15  
17  
RSET  
17  
8
17  
8
RSET  
RSET  
FPWM  
FPWM  
*VIN > 12V  
*VIN > 12V  
COMP  
18  
9
AGND  
*VIN > 12V  
COMP  
COMP  
9
18  
9
18  
AGND  
AGND  
FIGURE1A. SMBus/I2CCONTROLLEDDIMMING FIGURE 1B. PWM DIMMING WITH PWM INPUT  
FIGURE 1C. DIRECT PWM DIMMING  
AND ADJUSTABLE DIMMING  
FREQUENCY  
AND ADJUSTABLE DIMMING  
FREQUENCY  
FIGURE 1. ISL78171 TYPICAL APPLICATION DIAGRAMS  
FN8602 Rev.1.00  
Oct 20, 2017  
Page 1 of 29  
1234567...29

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