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ISL97687IRTZ-T

更新时间： 2024-10-14 12:28:19
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英特矽尔 - INTERSIL 驱动器
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24页 1358K
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4-Channel LED Driver with Phase Shift Control and 10-Bit Dimming Resolution

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ISL97687IRTZ-T 数据手册

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4-Channel LED Driver with Phase Shift Control and  
10-Bit Dimming Resolution  
ISL97687  
Features  
The ISL97687 is a PWM controlled LED driver that supports  
4 channels of LED current, for Monitor and TV LCD backlight  
applications. It is capable of driving 160mA per channel from a  
9V to 32V input supply, with current sources rated up to 75V  
absolute maximum.  
• 4x160mA, 75V rated channels with integrated channel  
regulation FETs  
• Channels can be ganged for high current  
- 2x350mA  
- 1x700mA  
The ISL97687’s current sources achieve typical current matching  
to ±1%, while dynamically maintaining the minimum required  
• 9V~32V input voltage  
• Dimming modes:  
VOUT necessary for regulation. This adaptive scheme  
- Direct PWM dimming from 100Hz~30kHz  
- PWM dimming with adjustable output frequency  
compensates for the non-uniformity of forward voltage variance  
in the LED strings.  
- 10-bit dimming resolution  
The ISL97687 can decode both an incoming PWM signal and an  
analog input voltage, for DC-to-PWM dimming applications.  
Modes include direct PWM and several modes where the PWM  
frequency is synthesized on chip at 10-bit resolution. This can be  
either free running, or synchronized with the frame rate to give  
both a frequency and a phase lock, minimizing panel to panel  
variation and display flicker. Phase shift is supported, reducing  
flicker and audio noise, as is multiplication of the incoming  
decoded analog and PWM values.  
- VSYNC function to synchronize PWM signal to frame rate  
- Phase shift  
- Analog to PWM dimming with 8-bit resolution  
• 2 selectable current levels for 3D applications  
• Current matching of ±1%  
• Integrated fault protection features such as string open circuit  
protection, string short circuit protection, overvoltage  
protection, and over-temperature protection  
• 28 Ld 5mmx5mm TQFN and 28 Ld 300mil SOIC Packages  
Available  
The ISL97687 has an advanced dynamic headroom control  
function, which monitors the highest LED forward voltage string,  
and regulates the output to the correct level to minimize power  
loss. This proprietary regulation scheme also allows for  
extremely linear PWM dimming from 0.02% to 100%. The LED  
current can also be switched between two current levels, giving  
support for 3D applications. The ISL97687 incorporates  
extensive protections of string open and short circuit detections,  
OVP, and OTP.  
Applications  
• Monitor/TV LED Backlighting  
• General/Industrial/Automotive Lighting  
Related Literature  
• See AN1674 for “ISL97687IRTZ-HEVALZ and ISL97687IRTZ-  
LEVALZ Evaluation Board User Guide” for TQFN Application  
• See AN1706 for “ISL97687IBZ-EVAL1Z Evaluation Board User  
Guide” for SOIC Application  
VIN: 9V~32V  
FUSE  
160mA MAX PER STRING  
D1  
VIN  
110  
SLEW  
VDC  
Q1  
I_CH2  
I_CH3  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
GD  
CS  
VLOGIC  
EN  
STV  
EN_VSYNC  
EN_ADIM  
PWMI  
RSENSE  
PGND  
COMP  
I_CH1  
I_CH4  
ACTL  
OVP  
EN_PS  
CSEL  
ISET1  
ISET2  
CH1  
CH2  
CH3  
CH4  
OSC  
PWM_SET/PLL  
20  
40  
60  
80  
100  
0
DIMMING DUTY CYCLE (%)  
FIGURE 1. ISL97687 APPLICATION DIAGRAM  
FIGURE 2. PWM DIMMING LINEARITY  
September 27, 2012  
FN7714.1  
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. 2011, 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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ISL97687IRTZ-T 替代型号

型号 品牌 替代类型 描述 数据表
ISL97687IRTZ INTERSIL

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