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| 型号： | ZXSC380FHTA |
| 厂商： | Diodes Inc |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 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： | 160kHz |
| 电源电压： | 0.8 V ~ 6 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： | ZXSC380FHDKR |
ZXSC380
Device description
The ZXSC380 is non-synchronous PFM, DC-DC controller IC which, with a high performance
internal transistor, for a high efficiency boost converter for use in single cell applications. A block
diagram is shown in Figure 1.
V CC
1
+
V REF
R1
R2
+
-
I SENSE
2
V OUT
GND
R SENSE
3
GND
Figure 1 ZXSC380 Block diagram
The on chip comparator forces the driver circuit and therefore the internal switching transistor to
switch off when the voltage at I SENSE exceeds 20mV. 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. This resistor is chosen to give 20mV at I SENSE for an
emitter current of 80mA.
A monostable following the output of the comparator forces the turn-off time of the output stage
to be typically 2.2 s. This ensures that there is sufficient time to discharge a significant proportion
of the energy stored in the inductor coil before the next On period.
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 internal switching transistor with a fixed drive current. To maximize
efficiency the internal transistor is switched quickly, typically being switched off within 30ns.
Issue 3 - September 2007
? Zetex Semiconductors plc 2007
5
www.zetex.com
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相关代理商/技术参数 |
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|---|---|
| ZXSC400 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:LED DRIVER BOOST CONVERTER |
| ZXSC400_06 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:Photoflash LED |
| ZXSC400E6 | 制造商:Diodes Incorporated 功能描述:IC LED DRIVER BOOST CONVERTER 400 |
| ZXSC400E6 | 制造商:Diodes Incorporated 功能描述:IC LED DRIVER BOOST CONVERTER 400 |
| ZXSC400E6TA | 功能描述:LED照明驱动器 Reg Bst LED Drvr 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 |
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