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参数资料
| 型号： | ZXLD1320DCATC |
| 厂商： | Diodes Inc |
| 文件页数： | 10/18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
ADJ pin
The ADJ pin is connected to the internal 500mV reference (VREF) via a 100k resistor. This biases
the ADJ pin to the reference voltage and defines nominal 100% LED current.
The ADJ pin can be overdriven with an external dc voltage between 50mV and 500mV to reduce
the LED current proportionally between 10% and 100% of the nominal value.
LED current can also be adjusted by applying a low frequency PWM signal to the ADJ pin to turn
the device On and Off. This will produce an average output current proportional to the duty cycle
of the control signal.
The device can be shut down by shorting the ADJ pin to ground, or pulling it to a voltage below
28mV with a suitable open collector NPN or open drain NMOS transistor. In the shutdown state,
most of the circuitry inside the device is switched off and residual quiescent current will be
typically 12μA.
POK output
The POK output comprises a switching transistor driven from the output of the re-triggerable
'500μs monostable'. Operation is such that the POK output remains high during normal operation
(monostable triggered), but switches low if the main switch transistor stays on for more than
500μs (monostable timed out). This output is designed to interface with a microcontroller input
to indicate a fault or out of range condition. It can also be used to drive an indicator LED.
Thermal control of LED current
The 'Thermal compensation current' circuit produces a sourcing current (Itc) which is zero for
voltages above 75mV on TADJ and increases to 100μA when TADJ falls to 50mV. This current is
summed into the control node and subtracted from the demand current, causing LED current to
reduce from 100% down to zero over this input range. The potential divider, consisting of a fixed
resistor Rt and an NTC Thermistor Rth between VREF and ground, defines the voltage on TADJ
and sets the threshold temperature. Further details are given in the application notes.
The Thermal Control feature can be disabled by leaving the TADJ pin floating, or by connecting
it to VREF.
Over-temperature shutdown
The ZXLD1320 incorporates an over-temperature shutdown circuit to protect the device against
damage caused by excess die temperature, resulting from excessive power dissipation in the
switch. The output of the 'Over-temp Shutdown' circuit will go high when the die temperature
exceeds 150°C (nominal). This will turn off the drive to the switch during normal operation.
Operation will resume when the device has cooled to a safe level.
Issue 1 - January 2008
? Zetex Semiconductors plc 2008
10
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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