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| 型号： | ZXLD1937ET5TA |
| 厂商： | Diodes Inc |
| 文件页数： | 9/16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
Dimming Control using a DC voltage
For applications where the EN pin is not available a DC
voltage can be used to control dimming. By adding
resistors R2 and R3 and applying a DC voltage, the LED
current can be adjusted from 100% to 0%. As the DC
voltage increases, the voltage drop across R2 increases
and the voltage drop across R1 decreases, thus
reducing the current through the LEDs. Selection of R2
Dimming Control using a logic signal
For applications where the LED current needs to be
adjusted in discrete steps a logic signal can be applied
as shown in the diagram below. When Q1 os 'off', R1
sets the minimum LED current. When Q1 is 'on', R2 sets
the LED current that will be added to the minimum LED
current. The formula for selecting values for R1 and R2
are given below:
and R3 should ensure that the current from the DC
voltage is much less than the LED current and much
larger than the feedback current. The component
values in the diagram below represent 0% to 100%
dimming control from a 0 to 2V DC voltage.
MOSFET ‘off’
I LED ( MIN ) =
MOSFET ‘on’
V FB
R LED
Dimming Control using a filtered PWM signal
The filtered PWM signal can be considered as an
adjustable DC voltage by applying a RC filter. The
values shown in the diagram below are configured to
give 0% to 100% dimming for a 1kHz to 100kHz PWM
signal with a 2V amplitude. e.g. a 50% duty cycle will
give 50% dimming.
ISSUE 1 - JULY 2004
9
V FB
I LED ( MAX ) = + I LED ( MIN )
R LED
where V FB = 100mV
SEMICONDUCTORS
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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