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| 型号： | ZXSC300E5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SOT23-5 |
| 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： | 无 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 200kHz |
| 电源电压： | 0.8 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXSC300E5DKR |
ZXSC300
DEVICE DESCRIPTION
The ZXSC300 is PFM, controller IC which, when
combined with a high performance external transistor,
enables the production of a high efficiency boost
converter for use in single cell LED driving
applications. A block diagram is shown for the
ZXSC300 in Figure 1.
With every on pulse the switching transistor is kept on
until the voltage across the current-sense resistor
exceeds the threshold of the I SENSE input. The on-pulse
length, and therefore the switching frequency, is
determined by the programmed peak current, the
input voltage and the input to output voltage
differential. See applications section for details.
The Driver circuit supplies the external switching
transistor with a fixed drive current. To maximise
efficiency the external transistor switched quickly,
typically being forced off within 30ns.
Pinout Diagram
Figure 1 ZXSC300 Block Diagram
The on chip comparator forces the driver circuit and
therefore the external switching transistor off if the
voltage at I SENSE exceeds 19mV. This threshold is set
by an internal reference circuit and divider.
The Voltage at I SENSE is taken from a current sense
resistor connected in series with the emitter of the
switching transistor. A monostable following the
output of the comparator forces the turn-off time of the
output stage to be typically 1.7μs. This ensures that
there is sufficient time to discharge the inductor coil
before the next on period.
Pin Descriptions
Pin No.
1
2
3
4
5
Name
V CC
Gnd
N/C
I SENSE
V DRIVE
Description
Supply voltage, generally Alkaline, NiMH or NiCd single cell
Ground
Not connected
Inductor current sense input. Internal threshold voltage set to 19mV.
Connect external sense resistor
Drive output for external switching transistor. Connect to base of external
switching transistor
ISSUE 4 - SEPTEMBER 2007
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXSC300E5TA | 制造商:Diodes Incorporated 功能描述:IC LED DRIVER SMD SOT-23-5 300 |
| ZXSC300E5TC | 功能描述:LED照明驱动器 White LED Drvr Cvrtr 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 |
| ZXSC310 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:LED DRIVER SOLUTION FOR LCD BACKLIGHTING |
| ZXSC310_04 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:LED DRIVER SOLUTION FOR LCD BACKLIGHTING |
| ZXSC310E5 | 制造商:Diodes Incorporated 功能描述:IC LED DRIVER BOOST CONVERTER 310 制造商:Diodes Incorporated 功能描述:IC, LED DRIVER BOOST CONVERTER, 310 制造商:Diodes Incorporated 功能描述:IC, LED DRIVER BOOST CONVERTER, 310; Topology:Boost; No. of Outputs:1; Output Current:3.5mA; Output Voltage:8V; Driver Case Style:SOT-23; Input Voltage Min:800mV; Input Voltage Max:8V; Switching Frequency:200kHz; Operating ;RoHS Compliant: Yes |
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