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参数资料
| 型号： | NCP5890MUTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16-UQFN |
| 产品变化通告： | Product Obsolescence 07/Jul/2010 |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光，照明管理装置（LMU） |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 1.13MHz ~ 1.47MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 30 V ~ 34 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFQFN 裸露焊盘 |
| 供应商设备封装： | 16-UQFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
NCP5890
PWM Sequence
The three PWM can be controlled according to one of the
possible sequence depicted in Figure 17. In all cases, the
Main Display is powered first.
Strategy #1 : the three PWM are fully synchronized and
share the same timings, the rise and fall time being
identical. At this point, the feedback voltage will rapidly
swap from a low 400 mV (normal operation) to the large Vf
span coming from the three LED added in series.
Strategy #2 : the three PWM share the same rise and fall
time, the sequence being synchronized but delayed until
Main Display
PWM1
the previous LED is at full power (PWM = 100%). This is
the most stable sequence, from a human eye stand point,
since we have a minimum blinking (one Vf variation only).
Strategy #3 : the three PWM share the same rise and fall
time but they can be activated independently.
Startegy#4 : the three PWM operate randomly: the
NCP5890 is capable of operating under such conditions,
but care must be observed since such random PWM (as
depicted by the circles) might be a stress from a human eye
stand point.
Strategy #1
Strategy #2
Strategy #3
Strategy #4
PWM2
PWM3
PWM1
PWM2
PWM3
PWM1
PWM2
PWM3
PWM1
PWM2
PWM3
Figure 17. Basic PWM Sequences
http://onsemi.com
16
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