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TPS61176RTER

更新时间： 2024-01-05 14:27:20
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德州仪器 - TI 驱动器电池
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28页 1260K
描述
High-Efficiency 6-Channel WLED Driver Supporting Single-Cell Li-Ion Battery Input

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TPS61176RTER 数据手册

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TPS61176  
www.ti.com  
SLVSBM5 –DECEMBER 2012  
High-Efficiency 6-Channel WLED Driver Supporting Single-Cell Li-Ion Battery Input  
Check for Samples: TPS61176  
1
FEATURES  
DESCRIPTION  
The TPS61176 is a highly integrated multi-channel  
WLED backlight driver for tablet or notebook PCs,  
which can support single-cell battery input directly. It  
comprises a high efficient boost converter with an  
integrated 2A/40V power MOSFET and six current  
sink regulators. In total, the device can drive up to 60  
WLEDs with high current matching performance. In  
addition, the boost automatically adjusts its output  
voltage to the WLED forward voltage to improve  
efficiency.  
•
•
•
•
•
•
•
•
•
2.7V to 6.5V VIN Voltage Range  
2.7V to 24V Boost Input Voltage Range  
Integrated 2A/40V MOSFET  
1MHz Switching Frequency  
Adaptive Boost Output to WLED Voltages  
Six Current Sinks of 35mA Capability Each  
±2% (Max) Current Accuracy  
1.3% (Typ) Current Matching  
TPS61176 adopts mixed dimming mode. The  
automatic switch between PWM dimming at low  
dimming duty cycle and analog dimming at high  
dimming duty cycle increases the overall electrical-to-  
optical efficiency, reducing the power budget for  
backlight remarkably. The switch point can be  
programmed to 12.5% or 25% and the PWM dimming  
mode can be programmed to fixed frequency  
dimming or direct PWM dimming. TPS61176 supports  
up to 14-bit dimming resolution, which avoids  
potential flickering perception during the low  
brightness dimming.  
Wide PWM Dimming Frequency Range  
–
from 100Hz to 22kHz  
•
Mixed Dimming Mode: Automatic Switch  
between Analog Dimming and PWM Dimming  
–
–
Programmable Switch Point: 25% / 12.5%  
Programmable PWM Dimming Mode: 22kHz  
PWM Dimming / Direct PWM Dimming  
•
•
•
•
•
Up to 14-bit Dimming Resolution  
Support down to 1% Dimming Duty Cycle  
Input PWM Glitch Filter  
By providing a driver for an external isolation P-  
channel MOSFET, TPS61176 can support true  
shutdown. When the IC is disabled or the boost  
output is short to ground, the isolation PFET can be  
turned off to cut off the power path from battery to the  
WLEDs, preventing any leakage current from the  
battery. TPS61176 also integrates soft start, WLED  
open and short protection and thermal shut down.  
Up to 90% Efficiency  
Driver for Input / Output Isolation PFET for  
True Shutdown  
•
•
•
•
•
Built-in Soft Start  
Built-in WLED Open / Short Protection  
Thermal Shutdown  
Support 4.7µH Inductor  
TPS61176 is in a 16 pin 3mm x 3mm QFN package,  
16L 3 mm x 3 mm QFN package  
providing  
a space-saving and high-performance  
WLED driver solution.  
APPLICATIONS  
TYPICAL APPLICATION  
•
•
•
Tablet Backlight  
L1  
4.7uH  
Notebook Backlight  
2.7V ~ 6.5V  
VIN  
Up to 38V  
D1  
Backlight for Small and Media Form Factor  
LCD Display with Single-Cell or Multi-Cell  
Battery Input  
C1  
2.2uF  
C2  
4.7uF  
SW  
MODE / FAULT  
VIN  
R3  
1M  
R2  
1.3M  
PGND  
OVP  
R4  
43k  
TPS61176  
IFB1  
IFB2  
IFB3  
IFB4  
VLDO  
C3  
1uF  
IFB5  
IFB6  
PWM  
PWM / EN  
ISET  
COMP  
C4  
0.47uF  
R1  
51k  
GND  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2012, Texas Instruments Incorporated  
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