参数资料
型号: LM3445MMX/NOPB
厂商: National Semiconductor
文件页数: 10/40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:
拓扑: PWM,降压(降压)
输出数: 1
内部驱动器:
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
SNVS570L – JANUARY 2009 – REVISED MAY 2013
SENSING THE RECTIFIED TRIAC WAVEFORM
A bridge rectifier, BR1, converts the line (mains) voltage ( Figure 15 c) into a series of half-sines as shown in
Figure 15 b. Figure 15 a shows a typical voltage waveform after diode D3 (valley fill circuit, or V BUCK ).
V BUCK
(a)
V BR1
(b)
V AC
(c)
t
Figure 15. Voltage Waveforms After Bridge Rectifier Without Triac Dimming
Figure 16 c and Figure 16 b show typical triac dimmed voltage waveforms before and after the bridge rectifier.
Figure 16 a shows a typical triac dimmed voltage waveform after diode D3 (valley fill circuit, or V BUCK ).
V BUCK
(a)
t
V BR1
(b)
t
V AC
(c)
t
delay
?
Figure 16. Voltage Waveforms After Bridge Rectifier With Triac Dimming
LM3445 LINE SENSING CIRCUITRY
An external series pass regulator (R2, D1, and Q1) translates the rectified line voltage to a level where it can be
sensed by the BLDR pin on the LM3445.
10
Product Folder Links: LM3445
Copyright ? 2009–2013, Texas Instruments Incorporated
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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
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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