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| 型号： | LM3445MMX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 8/40页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER TRIAC DIMM 10-MSOP |
| 应用说明： | LM3445 Reference Design |
| 标准包装： | 3,500 |
| 系列： | PowerWise® |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 30kHz ~ 1MHz |
| 电源电压： | 8 V ~ 12 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 配用： | LM3445-220VEVAL-ND - BOARD EVAL LM3445 220V LM3445-120VSMEV-ND - BOARD EVAL LM3445 110V LM3445TRIACEVAL-ND - BOARD EVAL LM3445MM |
| 其它名称： | LM3445MMX |
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SNVS570L – JANUARY 2009 – REVISED MAY 2013
An RC network consisting of R1, R2, and C1 delay the turn on of the triac until the voltage on C1 reaches the
trigger voltage of the diac. Increasing the resistance of the potentiometer (wiper moving downward) increases the
turn-on delay which decreases the on-time or "conduction angle" of the triac ( θ ). This reduces the average power
delivered to the load. Voltage waveforms for a simple triac dimmer are shown in Figure 13 . Figure 13 a shows the
full sinusoid of the input voltage. Even when set to full brightness, few dimmers will provide 100% on-time, i.e.,
the full sinusoid.
(a)
(b)
DELAY
?
?
DELAY
(c)
Figure 13. Line Voltage and Dimming Waveforms
Figure 13 b shows a theoretical waveform from a dimmer. The on-time is often referred to as the "conduction
angle" and may be stated in degrees or radians. The off-time represents the delay caused by the RC circuit
feeding the triac. The off-time be referred to as the "firing angle" and is simply 180° - θ .
Figure 13 c shows a waveform from a so-called reverse phase dimmer, sometimes referred to as an electronic
dimmer. These typically are more expensive, microcontroller based dimmers that use switching elements other
than triacs. Note that the conduction starts from the zero-crossing, and terminates some time later. This method
of control reduces the noise spike at the transition.
Since the LM3445 has been designed to assess the relative on-time and control the LED current accordingly,
most phase-control dimmers, both forward and reverse phase, may be used with success.
8
Product Folder Links: LM3445
Copyright ? 2009–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3445MX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Triac Dimmable Offline LED Driver |
| LM3445MX/NOPB | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| LM3445TRIACEVAL | 功能描述:BOARD EVAL LM3445MM RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:PowerWise® 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| LM3445TRIACEVAL/NOPB | 制造商:Texas Instruments 功能描述:TRIAC Dimmable Offline LED Driver Evaluation Board |
| LM3447 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Phase Dimmable, Primary Side Power Regulated PFC Flyback Controller for LED Lighting |
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