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| 型号： | ZXLD1320DCATC |
| 厂商： | Diodes Inc |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 14-TDFN |
| 特色产品： | LED Driver Solutions |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 600kHz |
| 电源电压： | 4 V ~ 18 V |
| 输出电压： | 18V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1320DCADKR |
ZXLD1320
Thermal compensation of LED current
High-luminance LEDs often need to be supplied with a temperature compensated current in order
to maintain stable and reliable operation at high temperatures. This is usually achieved by
reducing the LED current proportionally from its nominal set value when the LED temperature
rises above a predefined threshold. (Fig.3)
I LED
LED temperature
Fig 3
The 'Thermal compensation current' generator inside the ZXLD1320 provides the necessary thermal
compensation current to meet this requirement, using an NTC thermistor and resistor. (Fig 4)
Fig 4
The TADJ pin of the device has a voltage threshold of 75mV nominal, which is derived from the
reference voltage VREF. If the voltage (V TADJ ) on the TADJ pin is held above the threshold, the
thermal compensation current will be zero and no thermal compensation is applied. However, if
V TADJ falls below the threshold, a thermal compensation current (ITC) is produced that is
proportional to V TADJ . I TC is injected into the control loop in such a way as to reduce the demand
current I ADJ , causing the control loop to decrease the LED current. The LED current will be
reduced to less than 10% of the set value when V TADJ falls below 50mV.
The threshold voltage has been chosen to set a nominal threshold of 105 ° C and the device has
been optimized to operate with a standard 103KT1608 thermistor and 5k resistor in the potential
divider. Circuit details are given in the application notes. Alternative thermistor/resistor networks
can be used providing the input resistance presented to the device at the TADJ pin is similar at
the threshold temperature. If no LED thermal compensation is required, the TADJ pin should be
connected to VREF to disable this function.
Issue 1 - January 2008
? Zetex Semiconductors plc 2008
13
www.zetex.com
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD1321DCATC | IC LED DRVR WHITE BCKLGT 14-TDFN |
| ZXLD1322DCCTC | IC LED DRIVR WHITE BCKLGT 14-DFN |
| ZXLD1350ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXLD1352ET5TA | IC LED DRIVER HIGH BRIGHT TSOT-5 |
| ZXLD1356DACTC | IC LED DRIVER WHITE BCKLGT 6-DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1321 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:Boost mode DC-DC converter for LED driving with 1A output and current control |
| ZXLD1321DCATC | 功能描述:直流/直流开关转换器 DC-DC Boost Conv 1A output RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| ZXLD1322 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:BUCK/BOOST MODE DC-DC CONVERTER |
| ZXLD1322DCCTC | 功能描述:直流/直流开关转换器 Buck-Boost DC-DC Con 0.7A output RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| ZXLD1322DCCTC-CUT TAPE | 制造商:DIODES 功能描述:ZXLD1322 Series 15 V 600 kHz 700 mA Buck/Boost Mode DC-DC Converter - DFN-14 |
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