参数资料
型号: ZXLD1320DCATC
厂商: Diodes Inc
文件页数: 12/18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:
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
Fig 1
PWM control
A wider dimming range can be achieved by applying a PWM control signal to the ADJ pin to turn
the device on and off, giving an average output current proportional to the duty cycle of the
control signal. The ADJ pin can be driven directly from the open drain NMOS output of a
microcontroller, or indirectly with a low saturation voltage NPN transistor such as the Zetex
ZXTN25020DFL. (Fig 2).
ZXTN25015DFL
ADJ
ZXLD1320
Fig 2
In the circuit of Fig 4, the average LED output current will be
I LED ( avg ) = I LED ( nom ) * D
Where duty cycle
D =
T 2
( T 1 + T 2 )
A PWM frequency of 200Hz, or lower is recommended, to minimize errors due to the rise and fall
times of the converter output.
Issue 1 - January 2008
? Zetex Semiconductors plc 2008
12
www.zetex.com
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