- 您现在的位置：买卖IC网 > PDF目录17200 > LM3445-120VSMEV/NOPB (National Semiconductor)BOARD EVAL LM3445 110V PDF资料下载
参数资料
| 型号： | LM3445-120VSMEV/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 8/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LM3445 110V |
| 标准包装： | 1 |
| 系列： | PowerWise® |
| 电流 - 输出 / 通道： | 350mA |
| 输出及类型： | 1，非隔离 |
| 特点： | 可调光 |
| 输入电压： | 90 ~ 135VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM3445 |
| 产品目录页面： | 1285 (CN2011-ZH PDF) |
| 相关产品： | LM3445MMX-ND - IC LED DRIVER TRIAC DIMM 10-MSOP LM3445MMDKR-ND - IC LED DRIVER TRIAC DIMM 10-MSOP LM3445MMCT-ND - IC LED DRIVER TRIAC DIMM 10-MSOP LM3445MMTR-ND - IC LED DRIVER TRIAC DIMM 10-MSOP |
| 其它名称： | LM3445-120VSMEV |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
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
相关PDF资料 |
PDF描述 |
|---|---|
| 695D336X9015F2T | CAP TANT 33UF 15V 10% 2414 |
| GBA06DTAT | CONN EDGECARD 12POS R/A .125 SLD |
| RN-1524S | CONV DC/DC 1.25W 15VIN 24VOUT |
| LM3445-208277EV/NOPB | BOARD EVAL LED DRIVER LM3445 |
| ECM12DTKS | CONN EDGECARD 24POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3445-208277EV/NOPB | 功能描述:LED 照明开发工具 LM3445-208277 EVAL BOARD RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| LM3445-220VEVAL/NOPB | 功能描述:BOARD EVAL LM3445 220V RoHS:是 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 |
| LM3445-220VEVAL/NOPB | 制造商:Texas Instruments 功能描述:LED Driver Eval. Board |
| LM3445-230VFLBK/NOPB | 功能描述:LED 照明开发工具 LM3445-230VFLBK EVAL BOARD RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| LM3445A | 制造商:NSC 制造商全称:National Semiconductor 功能描述:A19 Edison Retrofit Evaluation Board Can drive up to 18 series LEDs |
发布紧急采购，3分钟左右您将得到回复。