CXLE87124适用于手机摄像头模块或数码相机的大功率闪光LED的理想电源解决方案。它是一个高度集成的升压型DC/DC转换器，开关频率非常高，固定在2兆赫，为便携式闪光灯提供非常小的整体解决方案。CXLE87124有单独的闪光模式和电影/火炬模式，使引脚最大的灵活性。闪光模式通常与660ms定时器控制一起使用，以产生高强度闪光。Flash模式和Movie/Torch模式的LED电流分别由外部电阻编程，使得Flash LED解决方案易于控制。如果两个启用引脚都处于逻辑高电平，则LED电流将由电影/火炬模式设置电阻器编程。
两个LED输出接收器可以在外部短接在一起，以获得更高功率的单闪LED，最高可达1.5A的连续LED电流。热调节集成在闪光模式，以限制集成电路的温度，并持续提供最大允许输出电流。
CXLE87124内置多种保护功能，包括逐周输入电流限制保护、输出过压保护、LED故障（开路或短路）保护和热关机保护。停机时泄漏电流小于1μA。
•双闪光灯LED输出
•每个通道最多可驱动1.5A或0.75A
•高效LED驱动器（高达90%）
•2兆赫升压转换器
•非常小的感应器：1.0μH
•独立闪光模式启用和电影/火炬
模式启用引脚
•闪光模式或电影/手电筒模式通过
脉宽调制控制
•10kHz至200kHz的脉宽调制调光频率
•一个电阻器设置闪光模式LED电流
•一个电阻设置电影/火炬模式LED电流
•集成热调节控制
•660ms闪光定时器控制
•ENM或ENF引脚上的330kΩ下拉电阻器
•LED开路或短路保护
•输出过压保护
•循环电感电流限制
•小于1μA的关闭电流
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[ CXLE87124 ]
目录
7.相关产品
产品概述 返回TOP
The CXLE87124 is the ideal power solution for high-power flash LEDs used with cell phone camera modules or digital still cameras. It is a highly integrated step-up DC/DC converter with very high switching frequency, fixed at 2MHz, providing a very small total solution for portable photo flash. The CXLE87124 has separate Flash mode and Movie/Torch mode enable pins for maximum flexibility. Flash mode is usually used with 660ms timer control to generate a high intensity flash. The Flash mode and Movie/Torch mode LED current is programmed by external resistors respectively, making the flash LED solution simple to control. If both enable pins are at logic high, the LED current will be programmed by the Movie/Torch mode setting resistor.
The two LED output sinks can be shorted together externally for higher power single flash LEDs, up to 1.5A continuous LED current. Thermal regulation is integrated in Flash mode to limit the IC’s temperature and continuously provide the maximum allowed output current.
Various protection features are built into the CXLE87124, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault (open or short) protection and thermal shutdown protection. The leakage current in shutdown is less than 1μA.
The CXLE87124 is available in Green TDFN-3×2-14L package. It operates over an ambient temperature range of -40℃ to +85℃.
产品特点 返回TOP
• Input Voltage Range: 3V to 5V
• Dual Flash LED Outputs
• Drive Up to Total 1.5A or 0.75A per Channel
• High Efficiency LED Driver (Up to 90%)
• 2MHz Step-Up Converter
• Very Small Inductor: 1.0μH
• Independent Flash Mode Enable and Movie/Torch
Mode Enable Pins
• Flash Mode or Movie/Torch Mode Dimming via
PWM Control
• 10kHz to 200kHz PWM Dimming Frequency
• One Resistor Sets Flash Mode LED Current
• One Resistor Sets Movie/Torch Mode LED Current
• Integrated Thermal Regulation Control
• 660ms Flash Timer Control
• 330kΩ Pull-Down Resistor on ENM or ENF Pin
• LED Open or Short Protection
• Output Over-Voltage Protection
• Cycle-by-Cycle Inductor Current Limit
• Less than 1μA Shutdown Current
• Available in Green TDFN-3×2-14L Package
• Temperature Range: -40℃ to +85℃
应用范围 返回TOP
Portable Equipments
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 |
|
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