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| 型号： | ZXLD1371QESTTC |
| 厂商： | Diodes Inc |
| 文件页数： | 33/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER |
| 特色产品： | ZXLD1371 LED Driver Controller |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | ZXLD1371QESTTCDIDKR |
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A Product Line of
Diodes Incorporated
ZXLD1371
Applications Information (cont.)
PWM Output Current Control & Dimming
The ZXLD1371 has a dedicated PWM dimming input that allows a wide dimming frequency range from 100Hz to 1kHz with
up to 1000:1 resolution; however higher dimming frequencies can be used – at the expense of dimming dynamic range and
accuracy.
Typically, for a PWM frequency of 1kHz, the error on the current linearity is lower than 5%; in particular the accuracy is
better than 1% for PWM from 5% to 100%. This is shown in the graph below:
Buck mode - L=33uH - Rs = 150m ? - PWM @ 1kHz
1500.00
1250.00
1000.00
750.00
500.00
250.00
0.00
10%
9%
8%
7%
6%
5%
4%
3%
2%
1%
0%
0
10
20
30
40
50
60
70
80
90
100
PWM
PWM @ 1kHz
Error
Figure 10. LED Current Linearity and Accuracy with PWM Dimming at 1kHz
For a PWM frequency of 100Hz, the error on the current linearity is lower than 2.5%; it becomes negligible for PWM greater
than 5%. This is shown in the graph below:
Buck mode - L=33uH - Rs = 150m ? - PWM @ 100Hz
1500.00
1250.00
1000.00
750.00
500.00
250.00
0.00
10%
9%
8%
7%
6%
5%
4%
3%
2%
1%
0%
0
10
20
30
40
50
60
70
80
90
100
PWM
PWM @ 100Hz
Error
Figure 11. LED Current Linearity and Accuracy with PWM Dimming at 100Hz
The PWM pin is designed to be driven by both 3.3V and 5V logic levels and as such doesn’t require open collector/drain
drive. It can also be driven by an open drain/collector transistor. In this case the designer can either use the internal pull-up
network or an external pull-up network in order to speed-up PWM transitions, as shown in the Boost/ Buck-Boost section.
ZXLD1371
Document number: DS35436 Rev. 1 - 2
33 of 42
www.diodes.com
February 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1374 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
| ZXLD1374_11 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST |
| ZXLD1374EST20TC | 功能描述:LED照明驱动器 60V 1.5A BUCK/BOOST LED DRIVER AEC-Q100 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| ZXLD1601 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 |
| ZXLD1601H6 | 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER SMD |
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