CXLE8195脉宽调制调光控制接口40V额定集成开关FET串联驱动LED的升压转换器输入电压2.7V至5.5V背光模式下200mV反馈电压LED电流由控制引脚的脉冲宽度调制PWM信号控制

CXLE8195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。CXLE8195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。为了最大限度地保护，该器件具有集成的开放式LED保护，禁用CXL8195，以防止输出电压超过IC绝对最大额定电压在开放的LED条件。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。

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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With a 40V rated integrated switch FET, the CXLE8195 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 CXLE8195 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 CXLE8195 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 CXLE8195 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

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• 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

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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

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电路原理图 返回TOP

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白光LED驱动器
Product	LED Connection	CH	Iq(μA)	SHDN Iq(μA)	Dimming	Package
CXLE8196	Common Anode	1	60	1	PWM	SOT-23-6
CXLE8176	Common Anode	4	100	1	PWM	TQFN-3x3-16L
CXLE8177	Common Anode	3	100	1	PWM	TQFN-3x3-16L
CXLE8178	Common Anode	4	240	1	PWM	SOT-23-6
CXLE8179	Common Anode	4	100	1	One-Wire	TQFN-3x3-16L
CXLE8180	Common Anode	4	550	5	One-Wire	TQFN-3x3-16L TDFN-2x2-8L MSOP-8
CXLE8181	Common Cathode	4	300	10	One-Wire	TQFN-3x3-16L
CXLE8182	Common Anode	6	210	1	One-Wire	TQFN-3x3-16L
CXLE8183	Common Cathode	6	300	10	One-Wire	TQFN-4x4-16L
CXLE8184	Common Anode	6	155	2.5@VIN =4.2V	PWM	TQFN-3x3-16L
CXLE8185	Common Anode	8	155	2.5@VIN = 4.2V	PWM	TQFN-3x3-20L
CXLE8186	Common Anode	8	155	2.5@VIN =4.2V	One-Wire	TQFN-3x3-20L
CXLE8187	Common Anode	1	200	1	PWM	TSOT-23-6
CXLE8188	Common Anode	1	200	1	One-Wire	TSOT-23-6
CXLE8189	Common Anode	1	400	1	PWM	TDFN-2x2-6L TSOT-23-6
CXLE8190	Common Anode	1	45	1	One-Wire	TDFN-2x2-8L
CXLE8191	Common Anode	1	200	1	PWM	TSOT-23-6
CXLE8192	Common Anode	1	400	1	PWM	TDFN-2x2-6L TSOT-23-6
CXLE8193	Common Anode	1	200	1	One-Wire	TDFN-2x2-8L
CXLE8194	Common Anode	1	200	1	PWM	TDFN-2x2-8L
CXLE8195	Common Anode	1	220	1	PWM	TDFN-2x2-6L