The CXLE8174 is a high power and high efficiency boost controller with 12-channel current sinker which is ideal for large LCD backlighting applications. CXLE8174 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 from a 4.5V to 28V input supply. The CXLE8174regulates the current in each LED string to the programmed value set by an external current setting resistor. The ECXLE8174current matching can achieve ±1.5% and regulation accuracy can reach ±2%. A 3μA shutdown current and 1.0V (ILED@60mA) feedback voltage and Maximum 65V output allows for up to 18 high-power LEDs in series will greatly improve efficiency and reduce power dissipation. The device supports pulse width modulation (PWM) brightness dimming and DC voltage dimming
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[ CXLE8174 ]"
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产品概述 返回TOP
CXLE8174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12通道LED电流驱动电路。CXLE8174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。CXLE8174输入电压范围从4.5V~28V，其升压转换器开关频率可由外接电阻进行设定，此控制器驱动一个外接的功率管为LED背光提供驱动电压。利用外接电阻可设定CXLE8174 12CHs LED电流，同时12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。CXLE8174具有3uA关断电流，1.0V (ILED@60mA)反馈电压，单串LED可达18颗，最大65V输出电压将极大改善芯片效率，降低了功耗。CXLE8174支持外部PWM调光模式与DC电压调光模式。在PWM调光模式下，PWM调光信号由PWMI引脚输入，此信号直接控制LED的开启与关断；在DC电压调光模式，由BOSC到地之间的电容来控制LED调光频率。CXLE8174集成了多种保护功能，如：LED开路、LED短路、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。The CXLE8174 is a high power and high efficiency boost controller with 12-channel current sinker which is ideal for large LCD backlighting applications. CXLE8174 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 from a 4.5V to 28V input supply. The CXLE8174regulates the current in each LED string to the programmed value set by an external current setting resistor. The ECXLE8174current matching can achieve ±1.5% and regulation accuracy can reach ±2%. A 3μA shutdown current and 1.0V (ILED@60mA) feedback voltage and Maximum 65V output allows for up to 18 high-power LEDs in series will greatly improve efficiency and reduce power dissipation. The device supports pulse width modulation (PWM) brightness dimming and DC voltage dimming. During digital PWM dimming, the WLED current is turned on/off at the duty cycle and frequency determined by the PWM signal on the PWMI pin. In DC voltage dimming, LEDs current turn ON/OFF frequency programmed by the capacitor from BOSC to GND. The CXLE8174integrated multiple protect functions, such as LED Open, LED Short, Output Over voltage, Over thermal, Input Over current, and Under voltage lockout (UVLO), these protection will prevent the LCD backlight from damage.
产品特点 返回TOP
• 3uA关断电流
• 可驱动12串LED并联，单串可达18LEDs
• 支持外部PWM和DC调光
• 高达65V输出电压
• 宽输入电压范围：4.5V ~ 28V
• 通道之间电流匹配精度为±1.5%
• 外接电阻设置升压转换器频率
• 内置多种保护功能
-电流极限保护
-LED短路检测
-过温保护
-输出过压保护
• 关断模式下LED电流完全关断
• 集成UVLO/过热保护
• 最小0.5μs LED开启时间
• 热增强28引脚的TSSOP28封装
• 符合RoHS指令，100%无铅封装
3μA shutdown current
12 strings in parallel and up to 18 LEDs perstring
External PWM or DC Voltage Dimming
Control
Output voltage up to 65V
Wide Input voltage range 4.5V to 28V
Better than 1.5% LED Current Regulation
Accuracy Between Strings
Boost Switching frequency can be programmed by external resistor
Multiple Fault Protections
-Current Limit protection
-Output Short circuit detection
-Over-temperature protection
-Output Over-voltage protection
LED current turn off in shutdown mode
Integrated UVLO/ Over Thermal protection
Minimal 0.5μs LED On-Time regulation
Thermal Enhanced 28pin TSSOP28 Package
RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free
应用范围 返回TOP
• LCD监视器背光
• LCD-电视背光
LCD Monitor LED Backlighting
LCD-TV LED Backlighting
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产品封装图 返回TOP
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电路原理图 返回TOP
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白光LED驅動器 > LED背光 |
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Part Number |
remark |
Vin (V) |
Vout (max)(V) |
FB(V) |
IQ(mA) |
Isw(A) |
Max LED |
Peak Efficency (%) |
Package |
|
Small Package, High Performance, Asynchronies Boost for WLED Driver |
2.6~5.5 |
18 |
0.2 |
0.4 |
2 |
15P3S |
93 |
TSOT23-5 |
|
|
White LED Driver For Buck-Boost Application |
6~25 |
32 |
Vctrl/10 |
1.3 |
1.4 |
3 x 9 = 27 |
90 |
TDFN-8 |
|
|
White LED Boost Converter with PWM Dimming and Single-Wire Interface |
2.7~5.5 |
38 |
0.2 |
0.35 |
1.3 |
12 |
91 |
TDFN-6 |
|
|
10 White LED Boost Converter with PWM Dimming and Single-Wire Series Interface |
2.5 ~ 5.5 |
38.5 |
0.2/0.3 |
0.3 |
1.3 |
12 |
88 |
TSOT23-6,SOT23-6 |
|
|
10 White LED Boost Converter with PWM Dimming |
2.5~5.5 |
38.5 |
0.2 |
0.3 |
1.3 |
12 |
88 |
TSOT23-6 |
|
|
6 String White LED Driver with Boost Converter |
2.5~24 |
43 |
0.5 |
2 |
2.5 |
6 × 10= 60 |
90 |
TQFN-20 |
|
|
4 Strings High Current White LED Driver with Boost Controller |
4.5~28 |
65 |
0.6 |
0.75 |
- |
4 x 18 =72 |
93 |
SOP-16 |
|
|
12 String White LED Driver With Boost Controller |
4.5~28 |
65 |
0.6 |
1.5 |
- |
216 |
93 |
TSSOP-28(EP) |
|
