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参数资料
| 型号： | ZXLD1321DCATC |
| 厂商： | Diodes Inc |
| 文件页数： | 11/20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，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 600kHz |
| 电源电压： | 2 V ~ 12 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： | ZXLD1321DCADKR |
ZXLD1321
Application notes
Setting peak coil current
The peak current in the coil is set by the resistor (R SENSE ) between the switch emitter and ground
according to
I SWpeak
=
50 mV
Rsense
The minimum peak current will depend on operating mode, coil inductance and supply voltage
range. The maximum peak current must not exceed the specified value for the switch. (See
Application circuits for details).
Setting LED current
The nominal average LED current is given by
I LED ( nom ) =
100 mV
R M
Where R M is the external resistor connected between pins M_VIN and M_LOAD.
This current can be adjusted to a lower value by applying a dc control voltage or PWM control
signal to the ADJ pin.
DC control
The LED current can be adjusted over a 10% to 100% range by connecting a variable resistor R ADJ
from the ADJ pin to ground to vary the dc voltage at the ADJ pin. R ADJ forms the lower part of a
resistive divider and the internal 100k ? resistor between the ADJ and VREF pins forms the upper
part. A value of 1M ? for RADJ will therefore give a maximum current of 91% of I LED (nom) and
the device will be turned off when the voltage on the ADJ pin falls below 28mV, corresponding to
an R ADJ value of approximately 5k ? . If required, an end-stop resistor in series with R ADJ can be
used to maintain the voltage on the ADJ pin above the turn-on threshold.
Using a logarithmic potentiometer for R ADJ will give an approximately linear variation of output
current with shaft rotation. (Fig 1)
If required, the maximum output current can be restored to 100% by adjusting the value of the
LED current monitor resistor (R M ). The tolerance of the internal 100k resistor and R ADJ should be
taken into account when calculating output current.
The ADJ pin is clamped internally to a voltage of 575mV (nom), to limit maximum average output
current to approximately 115% of I LED (nom).
Issue 1 - January 2008
? Zetex Semiconductors plc 2008
11
www.zetex.com
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| ZXLD1360ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ZXLD1322DCTC | 制造商:ZETEX 制造商全称:ZETEX 功能描述:Buck/boost mode DC-DC converter for LED driving with 700mA output and current control |
| ZXLD1350 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:350mA LED driver with internal switch |
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