收藏本站
AP5726
WHITE LED STEP-UP CONVERTER
Applications Information (Continued)
2. Using a DC Voltage
For some applications, the preferred method of brightness control is a variable DC voltage to adjust the
LED current. The dimming control using a DC voltage is shown in Figure 3 . As the DC voltage increases, the
voltage drop on R2 increases and the voltage drop on R SET decreases. Thus, the LED current decreases. The
selection of R2 and R3 will make the current from the variable DC source much smaller than the LED current and
much larger than the FB pin bias current. For V DC range from 0V to 2V, the selection of resistors in Figure 3 gives
dimming control of LED current from 0mA to 20mA.
AP5726
FB
R3
R2
V DC
100k
5k
R SET
15
Figure 3. Dimming Control Using a DC Voltage
3. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable
DC voltage source in dimming control.
4. Using a Logic Signal
For applications that need to adjust the LED current in discrete steps, a logic signal can be used as shown in
Figure 4 . R SET sets the minimum LED current (when the NMOS is off). R SET sets how much the LED current
increases when the NMOS is turned on.
AP5726
FB
R INC
Logic
Signal
R SET
Figure 4. Dimming Control Using a Logic Signal
AP5726
Document number: DS31845 Rev. 3 - 2
11 of 17
www.diodes.com
July 2010
? Diodes Incorporated
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
AP8800AWT-7 IC LED DRIVER TSOT23-5
AP8800FNG-7 IC LED DRIVER HIGH BRIGHT 10DFN
AP8801M8G-13 IC LED DRIVER HIGH BRIGHT 8MSOP
AP8802HSP-13 IC LED DRIVER HIGH BRIGHT 8SOIC
AP8802SPG-13 IC LED DRIVER HIGH BRIGHT 8SOIC
AP8803WTG-7 IC LED DRIVER CONN CURR TSOT23-5
APEK4402KLP-01-T-DK BOARD EVAL FOR A4402
APP-001-15AMP PLUG AUTO PWR BLACK W/LED 15AMP
相关代理商/技术参数
AP5726WUG-7 功能描述:开关变换器、稳压器与控制器 WH LED STEP-UP DC/DC CONV 2-6 LED RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel
AP5727 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:Boost converter for the bias voltage of small size OLED and LCD displays
AP5727_11 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED
AP5727WG-7 功能描述:开关变换器、稳压器与控制器 BIAS OLED PWR SUPPLY SUB TFT 1.2MHz RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel
AP5808 功能描述:LCD 图形显示模块和配件 Rack Accessories Plastic Black RoHS:否 制造商:ELECTRONIC ASSEMBLY 产品: 分辨率:128 x 64 流体类型:FSTN Positive 接口: 背光: 背景色:White 工作温度范围:- 20 C to + 70 C 封装:Bulk
AP5816 功能描述:LCD 图形显示模块和配件 Rack Accessories Plastic Black RoHS:否 制造商:ELECTRONIC ASSEMBLY 产品: 分辨率:128 x 64 流体类型:FSTN Positive 接口: 背光: 背景色:White 工作温度范围:- 20 C to + 70 C 封装:Bulk
AP5821 功能描述:电缆组件 USB to VGA LCD Controller 1.83m BLK RoHS:否 制造商:Molex 产品:Power Assemblies 类型:Cable Assembly 连接器端口 A:No Connector 连接器端口 A 管脚计数:4 连接器端口 B:No Connector 连接器端口 B 管脚计数: 型式:Male 线规 - 美国线规（AWG）:20, 28 长度:0.305 m 颜色:Black, Red
AP5822 功能描述:电缆组件 USB to VGA LCD Controller 3m BLK RoHS:否 制造商:Molex 产品:Power Assemblies 类型:Cable Assembly 连接器端口 A:No Connector 连接器端口 A 管脚计数:4 连接器端口 B:No Connector 连接器端口 B 管脚计数: 型式:Male 线规 - 美国线规（AWG）:20, 28 长度:0.305 m 颜色:Black, Red