产品概述 返回TOPhXU嘉泰姆
CXLE8172是一款用于中等尺寸LCD面板的LED背光驱动器，其内部集成了高效率升压转换器，同时提供6通道LED电流驱动电路。CXLE8172内置峰值电流2.5A/43V的MOSFET，采用电流模式架构，可同时驱动每路10个LED，共6路LED。升压转换器开关频率可由外接电阻进行设定。利用外接电阻可设定CXLE8172 6个通道LED电流，同时6通道间LED电流匹配达±1.5%，每一通道LED电流精度高达±2%，此性能保证了LED背光亮度的均一性与精确性。为了保证LED驱动电路的正常工作，升压转换器会采样6通道中最小的反馈电压来产生合适的输出电压。CXLE8172具有2.5V～24V宽的输入电压范围，可提供5mA～50mA的LED电流，还有峰值电流限制功能。采用PWM和模拟混合调光模式实现LED电流的精确控制。CXLE8172内置多种保护功能，如LED开路/短路、输出过压、过温关断和欠压保护，这些保护能有效的防止LCD背光的失效和损坏。CXLE8172采用20引脚3mm×3mm 的TQFN封装。The CXLE8172 is a high efficiency boost regulator with
6 channel current sinker which is ideal for media size
LCD backlighting applications.
The device with integrated 2.5A/43V power MOSFET
uses current mode architecture and drives six strings in
parallel and supports up to 10 pieces of LEDs per
string. The switching frequency is programmable by an
external frequency setting resistor. The CXLE8172
regulates the current in each LED string to the
programmed value set by an external current setting
resistor. The CXLE8172 current matching can achieve
±2%. To provide enough headroom for the operating of
current sink, boost converter monitors the minimum
voltage of feedback pins and regulates an optimized
output voltage for power efficiency.
The CXLE8172has wide input voltage range from 2.5V
to 24V and provides adjustable 5mA to 50mA LED
current. It provides cycle-by-cycle over current
protection. The device supports PWM and analog
brightness dimming functions for accurate LED current
control.
The CXLE8172integrated multiple protect functions,
such as LED open, LED short, output over voltage,
over thermal and under voltage lockout, these
protections will prevent the LCD backlight from
damage.
The CXLE8172is available in a 3×3mm TQFN-20L
package.
产品特点 返回TOPhXU嘉泰姆
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‧输入电压范围：2.5-24VhXU嘉泰姆
‧可同时驱动6路每路10个WLEDhXU嘉泰姆
‧集成2.5A/43V MOSFEThXU嘉泰姆
‧输出电压可达43VhXU嘉泰姆
‧外部可调5mA~50mA LED电流hXU嘉泰姆
‧PWM 调光频率可达20kHzhXU嘉泰姆
‧PWM 转模拟调光模式调光频率可达20kHz，具有8位分辨率的精度</p>
‧每路LED之间2%的精度</p>
‧多种故障保护hXU嘉泰姆
- 过流保护hXU嘉泰姆
- 过压保护hXU嘉泰姆
- 过温保护hXU嘉泰姆
- LED开路/短路保护hXU嘉泰姆
‧3mm×3mm TQFN-20封装hXU嘉泰姆
‧符合RoHS规范及Pb-Free Halogen-FreehXU嘉泰姆
2.5V to 24 V Input VoltagehXU嘉泰姆
6 Strings in Parallel and Up to 10 WLEDs PerhXU嘉泰姆
StringhXU嘉泰姆
Integrated 2.5A 43V MOSFEThXU嘉泰姆
Output Voltage Up to 43VhXU嘉泰姆
Programmable Full Channel Current from 5mA to 50mAhXU嘉泰姆
Direct PWM Dimming up to 20kHzhXU嘉泰姆
PWM to Analog Dimming up to 20kHz with 8 bit resolutionhXU嘉泰姆
Better Than 2% Current Regulation AccuracyhXU嘉泰姆
Between StringshXU嘉泰姆
Multiple Fault ProtectionshXU嘉泰姆
-Current Limit ProtectionhXU嘉泰姆
-Over Voltage ProtectionhXU嘉泰姆
-Over Temperature ProtectionhXU嘉泰姆
-WLED Open/Short ProtectionhXU嘉泰姆
Available in 3mm×3mm TQFN-20 PackagehXU嘉泰姆
RoHS Compliant and 100% Lead (Pb)-FreehXU嘉泰姆
Halogen-FreehXU嘉泰姆
应用范围 返回TOPhXU嘉泰姆
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‧笔记本LCD背光显示hXU嘉泰姆
‧个人电脑LCD背光显示hXU嘉泰姆
Notebook LCD Display BacklighthXU嘉泰姆
UMPC LCD Display BacklighthXU嘉泰姆
技术规格书（产品PDF) 返回TOP hXU嘉泰姆
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