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| 型号： | ZXLD1937ET5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| 产品变化通告： | End of Life 16/Sept/2011 |
| 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： | 背光 |
| 频率： | 1MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 28V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1937ET5DKR |
LAST TIME BUY
Closest Alternative is AP5724WUG-7
ZXLD1937
APPLICATIONS
Programming the maximum LED current
The maximum LED current is programmed by adding a
single resistor in series with the LED chain. The current
is determined by the resistor value and feedback
voltage and is given by:
I LED = V FB /R1
where V FB =100mV
The table below gives recommended resistor values
for required LED currents:
Pulsed Dimming - Gated Mode
If a lower frequency of 1kHz or less is applied to the EN
pin, the device will be gated 'on' and 'off' at a duty cycle
(D) corresponding to that of the input signal. The
average output current is then given by:
I OUTavg ? 0.1D/R1
This mode may be preferred over dc current control if
the purest white output is required. However, note the
120 s nominal turn-off delay of the device, when using
the device in this mode.
LED Current
10mA
15mA
20mA
30mA
R1 Value
10
6.8
5
3.3
Dimming Control via a PWM signal on the EN pin
A Pulse Width Modulated (PWM) signal can be applied
to the EN pin in order to adjust the output current to a
value below the maximum LED current. Two modes of
adjustment are possible as described below.
True Analog Dimming - Filtered ‘DC’ mode
If a PWM signal of 10kHz or higher is applied to the EN
pin, the device will remain active when the EN pin is
low. However, the input to the internal low pass filter
will be switched alternately from V REF to ground, with a
duty cycle (D) corresponding to that of the PWM signal.
This will present a filtered dc voltage equal to the duty
cycle multiplied by V REF to the control loop and will
produce a dc output current lower than the maximum
set value. This current is given by:
I OUTdc = 0.1D/R1
This mode of adjustment minimizes flicker in the light
output and system noise.
ISSUE 1 - JULY 2004
SEMICONDUCTORS
8
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD381FHTA | IC LED DRIVR WHITE BCKLT SOT23-3 |
| ZXLD383ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| ZXSC300E5TA | IC LED DRVR WHITE BCKLGT SOT23-5 |
| ZXSC380FHTA | IC LED DRVR WHITE BCKLGT SOT23-3 |
| ZXSC400E6TA | IC LED DRVR WHITE BCKLGT SOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1937ET5TC | 制造商:Diodes Incorporated 功能描述: |
| ZXLD300 | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:SENS HEAD RFLCTV SPOT BEAM 300MM 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:DIFFUSE RFLCT SPOT BEAM 300mm |
| ZX-LD300 | 功能描述:光电传感器 DIFFUSE RFLCT SPOT BEAM 300mm RoHS:否 制造商:Omron Industrial 感应方式:Retroreflective 感应距离:2 m 光源:Infrared LED 放大器类型: 连接:Prewired Cable 输出配置:Light ON |
| ZXLD300L | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:SENS HEAD RFLCTV LINE BEAM 300MM 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:DIFFUSE RFLCT LINE BEAM 300mm |
| ZX-LD300L | 功能描述:光电传感器 DIFFUSE RFLCT LINE BEAM 300mm RoHS:否 制造商:Omron Industrial 感应方式:Retroreflective 感应距离:2 m 光源:Infrared LED 放大器类型: 连接:Prewired Cable 输出配置:Light ON |
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