EUP2998-带升压控制器的4串大电流白光LED驱动器  DataSheet
概述
EUP2998是一款专用于大尺寸LCD面板LED背光驱动器，其内部集成大功率/高效率升压转换器，同时提供4通道LED电流驱动电路。
EUP2998内置固定开关频率的电流模式升压控制器，此结构能在每个开关周期内都有效控制电感峰值电流。EUP2998输入电压范围从8V~35V，此控制器驱动一个外接的功率管为LED背光提供驱动电压（最高电压可以到90V）。利用外接电阻可设定EUP2998 4个通道的 LED电流，同时4通道间LED电流匹配达±1.5%。
EUP2998具有3uA关断电流，0.4V (ILED@100mA)反馈电压将极大改善芯片效率，降低了功耗。
EUP2998支持外部PWM直接调光模式与PWM转模拟电压调光模式。PWM调光信号由PWMI引脚输入，LPF脚的外部电路连接方式决定芯片工作在外部PWM直接调光模式还是PWM转模拟电压调光模式。
EUP2998集成了多种保护功能，如：LED开路、LED短路、电感短路、肖特基二极管短路、通道直接短路到Vout、输出过压、过温、过流以及欠压保护，这些功能将有效的保证LCD背光的可靠性。
EUP2998采用的是TSSOP16-EP和 SOP-16封装.
特点
•8.5V的外部功率管栅驱动电压
•可驱动4串LED并联，单串可达25LEDs
•单串LED的最大电流可以到240mA
•支持外部PWM直接调光模式和PWM转模拟电压调光模式
•内置转换器将外部PWM信号转换成模拟电压调光信号
•Boost输出电压最大可以到90V
•Boost的开关频率可以通过外部电阻设定
•输入电压范围从8V到35V
•通道间LED电流匹配达±1.5%
•多种保护功能
-电流极限保护
-输出短路保护
-过温保护
-输出过压保护
•关掉模式下LED电流关断
•支持多芯片级联工作
•使用TSSOP16-EP和 SOP-16 封装
•符合RoHS规范及无铅，无卤
应用
•手机自动聚焦模组
•数码照相机模组
•图像稳定系统
EUP2998-4 Strings High Current White LED Driver with Boost Controller
Description
The EUP2998 is a high power and high efficiency boost controller with 4-channel current sinker which is ideal for large LCD backlighting applications.
EUP2998 uses current mode, fixed frequency architecture which can clamp the inductor peak current each cycle. The switching frequency is programmable by an external frequency setting resistor. It drives an external MOSFET to boost up the output voltage to maximum value of 90V from a 8V to 35V input supply. The EUP2998 regulates the current in each LED string to the programmed value set by an external current setting resistor. The EUP2998 current matching can achieve ±1.5%.
A 3μA shutdown current and 0.4V (ILED@100mA) feedback voltage will greatly improve efficiency and reduce power dissipation.
The device supports both direct pulse width modulation (PWM) brightness dimming and PWM to Analog dimming. When use PWM dimming signal to adjust the LEDs brightness, a direct PWM LED current and analog LED current will obtained set by the external circuits connected to LPF.
The EUP2998 integrated multiple protect functions, such as LED Open, LED Short, Inductor Short, Schottky Diode Short, CHx Short to Vout, Output Over Voltage, Over thermal, Input Over Current, and Under Voltage Lockout (UVLO), these protection will prevent the LCD backlight from damage.
EUP2998 is available in TSSOP16-EP and SOP-16 packages.
Feature
•8.5V gate driver
•4 strings in parallel and up to 25 LEDs per string
•Up to 240mA drive capability for each string
•Supports both Analog and Direct PWM Dimming
•Built in convert for converting external PWM signal to analog dimming signal
•Output voltage up to 90V
•Boost Switching frequency can be programmed by external resistor
•Wide Input voltage range 8V to 35V
•Better than 1.5% LED Current Regulation Accuracy Between Strings
•Multiple Fault Protections
-Current Limit protection
-Output Short circuit detection
-Over-temperature protection
-Output Over-voltage protection
•LED current turn off in shutdown mode
•Support multiple-IC parallel operation
•Thermal Enhanced TSSOP-16L and SOP-16 Packages
•RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free
Application
•Desktop LCD Flat Panel Displays
•Flat Panel Video Displays
•LCD TVs and Monitors |