- 您现在的位置：买卖IC网 > Datasheet目录370 > ZXLD381FHTA (Diodes Inc)IC LED DRIVR WHITE BCKLT SOT23-3 Datasheet资料下载
参数资料
| 型号： | ZXLD381FHTA |
| 厂商： | Diodes Inc |
| 文件页数： | 4/9页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLT SOT23-3 |
| 特色产品： | LED Driver Solutions |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 350kHz |
| 电源电压： | 0.9 V ~ 2.2 V |
| 输出电压： | 20V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 工作温度： | 0°C ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD381FHDKR |
A Product Line of
Diodes Incorporated
ZXLD381
Device Description
The ZXLD381 is a simple PFM, DC-DC controller combined with a high performance internal switching transistor, enabling the
production of a high efficiency boost converter for use in single cell applications. A block diagram is shown for the ZXLD381 in
Fig 1.
When power is applied, an oscillator within the pulse control block forces the internal switching transistor to switch on to start
an energy charge cycle. The low saturation voltage switch pulls the V OUT pin close to ground which forces the supply voltage
across the external inductor L1. This causes a current to build up, storing energy in the inductor. During this phase, switch
current and supply voltage are monitored and used by the pulse control circuit to determine the optimum drive conditions and
on-time. At the end of the energy charge cycle, the internal switch is turned off rapidly, interrupting the current flow through L1
which causes the voltage on V OUT to rise dramatically. When the voltage on V OUT reaches the load LED's forward (on)
voltage, the inductor current is transferred from the internal switch to the LED, starting the energy discharge cycle. With the
voltage across the inductor reversed, the current flowing through it (and the LED) now falls. When the inductor current reaches
zero, the voltage on the V OUT pin falls back towards V CC . This action is sensed by the pulse control circuit, which initiates the
next energy charge cycle. Except for low level losses, all the energy stored in the inductor during a charge cycle will be
channeled to the load LED during the following discharge cycle.
The current fed into the load LED has a sawtooth waveform, the average (DC) value of which is kept constant by the pulse
control circuit for varying supply voltage and temperature. It is possible to change the output current given by the ZXLD381 by
changing the value of inductor L1. The larger the inductance of L1, the lower the output current. A table/graph showing the
relationship between inductance and output current is given later in this datasheet. Since the output current of the ZXLD381 is
a sawtooth waveform, its peak value is substantially larger than the DC/average value. The table also provides this data.
The internal switching transistor has a minimum collector-emitter breakdown voltage of 20V and this sets the maximum load
voltage allowable. The minimum value is set by a feature of the pulse control circuit that requires the load voltage to be at least
0.8V greater than V CC . (The device will function with load voltages smaller than this but output current regulation will be
impaired.) Higher than nominal load voltages will lower the average (DC) output current generated for a given inductor value.
ZXLD381
Document number: DS32188 Rev. 3 - 2
4 of 9
www.diodes.com
May 2010
? Diodes Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD383ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXSC300E5TA | IC LED DRVR WHITE BCKLGT SOT23-5 |
| ZXSC380FHTA | IC LED DRVR WHITE BCKLGT SOT23-3 |
| ZXSC400E6TA | IC LED DRVR WHITE BCKLGT SOT23-6 |
| 0-1005447-1 | SENSOR PIEZO FILM VIBRA MASS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD381FHTA-CUT TAPE | 制造商:DIODES 功能描述:ZXLD381 Series 55 mA 350 kHz Single or Multi Cell LED Driver Solution - SOT-23-3 |
| ZXLD383 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:SINGLE OR MULTI CELL LED DRIVER SOLUTION |
| ZXLD383ET5TA | 功能描述:LED照明驱动器 LED DRIVER ENABLE/RECTIFR INPUT RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| ZXLD40 | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:SENS HEAD RFLECTV SPOT BEAM 40MM 制造商:Omron Electronic Components LLC 功能描述:Smart Sensor 11-Pin 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:DIFFUSE RFLCT SPOT BEAM 40mm |
| ZX-LD40 | 功能描述:光电传感器 DIFFUSE RFLCT SPOT BEAM 40mm RoHS:否 制造商:Omron Industrial 感应方式:Retroreflective 感应距离:2 m 光源:Infrared LED 放大器类型: 连接:Prewired Cable 输出配置:Light ON |
发布紧急采购，3分钟左右您将得到回复。