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| 型号： | LM3445M/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 16/40页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER TRIAC DIMM 14SOIC |
| 特色产品： | LM3445 TRIAC Dimmable LED Driver |
| 标准包装： | 55 |
| 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： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1285 (CN2011-ZH PDF) |
| 其它名称： | LM3445M |
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SNVS570L – JANUARY 2009 – REVISED MAY 2013
I AVE
I L2 (t)
' i L
I L2-PK
I L2-MIN
t ON
t OFF
t
Figure 22. Inductor Current Waveform in CCM
During the off-period denoted by t OFF , the current through L2 continues to flow through the LEDs via D10.
MASTER/SLAVE OPERATION
Multiple LM3445s can be configured so that large strings of LEDs can be controlled by a single triac dimmer. By
doing so, smooth consistent dimming for multiple LED circuits is achieved.
When the FLTR1 pin is tied above 4.9V (typical), preferably to VCC, the ramp comparator is tri-stated, disabling
the dim decoder. This allows one or more LM3445 devices or PWM LED driver devices (slaves) to be controlled
by a single LM3445 (master) by connecting their DIM pins together.
MASTER/SLAVE CONFIGURATION
TI offers an LM3445 demonstration PCB for customer evaluation through our website. The following description
and theory uses reference designators that follow our evaluation PCB. The LM3445 Master/Slave schematics are
illustrated below ( Figure 23 through Figure 25 ) for clarity. Each board contains a separate circuit for the Master
and Slave function. Both the Master and Slave boards will need to be modified from their original stand alone
function so that they can be coupled together. Only the Master LM3445 requires use of the Master/Slave circuit
for any number of slaves.
MASTER BOARD MODIFICATIONS
?
?
?
Remove R10 and replace with a BAS40 diode
Connect TP18 to TP14 (V CC )
Connect TP17 (gate of Q5) to TP15 (gate of Q2)
SLAVE BOARD(S) MODIFICATIONS
?
?
Remove R11 (disconnects BLDR)
Tie TP14 (FLTR1) to V CC
MASTER/SLAVE(S) INTERCONNECTION
?
?
Connect TP19 of Master to TP10 of Slave (Master VCC Control)
Connect TP6 (DIM pin) of Master to TP6 (DIM pin) of Slave (Master DIM Control)
MASTER/SLAVE THEORY OF OPERATION
By placing two series diodes on the Master VCC circuit one forces the master VCC UVLO to become the
dominant threshold. When Master VCC drops below UVLO, GATE stops switching and the RC timer (>200 μs)
rises above the TL431 threshold (2.5V) which in turn pulls down on the gate of the Slave pass device (Q1).
The valley-fill circuit could consist of one large circuit to power all LM3445 series connected, or each LM3445
circuit could have a separate valley-fill circuit located near the buck converter.
16
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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