CXLE87127采用40V额定集成开关FET，是一个串联驱动LED的升压转换器。boost转换器有一个40V，3A的内部MOSFET；因此它可以驱动单个或平行的LED串，用于小到大尺寸的面板背光。它非常适合用显示设备作为闪光模式光源的智能手机图像采集，当频闪信号激活时，它可以在30V下输出高达200mA的电流，持续320ms。
背光模式默认白色LED电流由外部传感器电阻RSET设置，反馈电压调节为200mV，如典型应用所示。在操作过程中，LED电流可以由施加到控制引脚的脉冲宽度调制（PWM）信号控制，通过该信号，占空比确定反馈参考电压。CXLE87127不会触发LED电流；因此，它不会在输出电容器上产生可听的噪音。为实现最大保护，该设备采用集成的开放式LED保护，该保护禁用CXLE87127，以防止在开放式LED条件下输出电压超过IC绝对最大电压额定值。
装置工作时，如果拉上选通管脚，在100μs内开启闪光模式，并将反馈电压调节到由PWM信号占空比决定的背光模式的5倍。当选通管脚被拉下或选通信号在320ms定时器上保持高电平时，在100μs内变为背光模式。
•输入电压范围：2.7V至5.5V
•集成3A/40V MOSFET
•输出电压高达38V（OVP）
•30V时输出电流高达200mA
•累计320ms闪光定时器控制
•1.2兆赫开关频率
•脉宽调制调光控制接口
•脉宽调制频率：20kHz~100kHz
•图像采集模式的选通接口
•7S2P LED的效率高达87%
•3S20P LED的效率高达92%
•在1:500范围内稳定调光
•背光模式下的200mV反馈电压
•闪速模式下的1000mV反馈电压
•内置软启动功能
•过电压保护
•内置WLED开路/短路保护
•轻载时的PFM模式
•热关机
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[ CXLE87127 ]"
目录
7.相关产品
产品概述 返回TOP
With a 40V rated integrated switch FET, the CXLE87127 is a boost converter that drives LEDs in series. The boost converter has a 40V, 3A internal MOSFET; thus it can drive single or parallel LED strings for small to large size panel backlighting. And it is quite suitable for smart phone image capture using display device as a flash mode light source, as it can output up to 200mA current at 30V for 320ms when the strobe signal is active.
The backlight mode default white LED current is set with the external sensor resistor, RSET, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, the LED current can be controlled by a pulse width modulation (PWM) signal applied to the CTRL pin, through which the duty cycle determines the feedback reference voltage. The CXLE87127 does not burst the LED current; therefore, it does not generate audible noises on the output capacitor. For maximum protection, the device features integrated open LED protection that disables the CXLE87127 to prevent the output voltage from exceeding the IC absolute maximum voltage ratings during open LED conditions.
When the device is working, if the STROBE pin is pulled up, it will turn on flash mode within 100μs. And the feedback voltage is regulated to 5× of the backlight mode that determined by the PWM signal duty cycle. And it will turn to backlight mode within 100μs when the STROBE pin is pulled down or the strobe signal keeps high over the 320ms timer.
The CXLE87127 is available in Green TDFN-2×2-6L package. It operates over an ambient temperature range of -40℃ to +85℃.
产品特点 返回TOP
• Input Voltage Range: 2.7V to 5.5V
• Integrated 3A/40V MOSFET
• Output Voltage Up to 38V (OVP)
• Output Current Up to 200mA @ 30V
• Accumulated 320ms Flash Timer Control
• 1.2MHz Switching Frequency
• PWM Dimming Control Interfaces
• PWM Frequency: 20kHz ~ 100kHz
• Strobe Interface for Image Capture Mode
• Up to 87% Efficiency for 7S2P LEDs
• Up to 92% Efficiency for 3S20P LEDs
• Dimming Stable in 1:500 Range
• 200mV Feedback Voltage in Backlight Mode
• 1000mV Feedback Voltage in Flash Mode
• Built-In Soft-Start Function
• Over-Voltage Protection
• Built-In WLED Open/Short Protection
• PFM Mode at Light Load
• Thermal Shutdown
• -40℃ to +85℃ Operating Temperature Range
• Available in Green TDFN-2×2-6L Package
应用范围 返回TOP
Smart phones
PDAs, Handheld Computers
Backlight for Small and Medium Form-Factor LCD Display with Single-Cell Battery Input
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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LED闪光灯驱动器 |
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Part Number |
CH |
VIN(Min) (V) |
VIN(Max) (V) |
Output Current(mA) |
SHDN Iq (μA) |
Frequency (MHz) |
Package |
|
1 |
2.7 |
5.5 |
500 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
1 |
2.7 |
5.5 |
500 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
1 |
2.7 |
5.5 |
700 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
1 |
2.7 |
5.5 |
700 |
1 |
2.2 |
TDFN-3x3-10L |
|
|
2 |
3 |
5 |
750 |
1 |
2 |
TDFN-3x2-14L |
|
|
2 |
3 |
5 |
750 |
1 |
2 |
TDFN-3x2-14L |
|
|
2 |
3 |
5 |
750 |
1 |
2 |
TDFN-3x2-14L |
|
|
1 |
2.7 |
5.5 |
200 |
1 |
1.2 |
TDFN-2x2-6L |
|
