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MP3385AGR

更新时间： 2024-11-22 01:22:43
品牌 Logo 应用领域
芯源 - MPS /
页数 文件大小 规格书
25页 688K
描述
4-String, 80V Output, WLED Controller with I2C Interface

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MP3385AGR 数据手册

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MP3385A  
4-String, 80V Output,  
WLED Controller with I2C Interface  
The Future of Analog IC Technology  
DESCRIPTION  
FEATURES  
The MP3385A is a step-up controller with four  
regulated current channels designed to drive  
WLED arrays for mid- and large-sized LCD  
panel backlighting applications.  
4-String, Max 300mA/String WLED Driver  
4.5V to 33V Input Voltage Range  
80V ABS Rating for Each String  
1.8% Current Matching Accuracy for Each  
String  
The MP3385A uses peak-current mode and  
PWM control architecture for system loop  
regulation. The MP3385A drives an external  
MOSFET to boost up the output voltage from a  
4.5V-to-33V input supply.  
The MP3385A employs an I2C digital interface  
that can flexibly set operation and protection  
modes, including dimming mode, dimming  
current and dimming ratio, OCP, OVP, LED  
short protection threshold, and switching  
frequency. For easy application use and board  
debugging, the MP3385A detects and disables  
the unused LED strings automatically during  
start-up to avoid charging the output to the OVP  
threshold.  
Unused Channel Auto-Detection Function  
during Start-Up  
100kHz-900kHz Programmable Switching  
Frequency  
Multiple Dimming Modes Selected by I2C  
Interface  
o Direct PWM Dimming Mode  
o Internal Fixed 23kHz PWM Dimming  
Mode by I2C  
o Analog Dimming Mode by Input Pulse  
o Internal Analog Dimming Mode by I2C  
o Mixed Dimming Mode by Input Pulse  
o Internal Mixed Dimming Mode by I2C  
2%-100% Programmable Full Scale Current  
with 8-Bit Resolution  
0%-100% LED Dimming Range with 10-Bit  
Resolution for Internal Dimming Mode  
Cascading Capability with a Single Power  
Source  
18V to 80V Over-Voltage Protection (OVP),  
2V/Step  
The MP3385A achieves 1.8% current matching  
between each string. The low regulation voltage  
on the LED current sources improves efficiency  
and reduces power loss to achieve a higher  
current output.  
The MP3385A supports analog, PWM, and  
combined analog and PWM dimming modes to  
meet different application requirements. Full  
0.15V to 0.5V Latch-Off/Recoverable Over-  
Current Protection (OCP) Threshold,  
50mV/Step  
protection  
features  
include  
over-current  
Recoverable Thermal Shutdown Protection  
protection (OCP), over-temperature protection  
(OTP), under-voltage protection (UVP), over-  
voltage protection (OVP), LED short/open  
protection, and inductor/diode short protection.  
APPLICATIONS  
Desktop LCD Flat Panel Displays  
All-in-One PCs  
2D/3D LCD TVs  
The MP3385A is available in a QFN-20  
(4mmx4mm) package.  
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For  
MPS green status, please visit the MPS website under Quality  
Assurance. “MPS” and “The Future of Analog IC Technology” are registered  
trademarks of Monolithic Power Systems, Inc.  
MP3385A Rev. 1.01  
8/29/2017  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2017 MPS. All Rights Reserved.  
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