- 您现在的位置：买卖IC网 > PDF目录20804 > LM3445MX/NOPB (National Semiconductor)IC LED DRIVER TRIAC DIMM 14SOIC PDF资料下载
参数资料
| 型号： | LM3445MX/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 |
| 标准包装： | 2,500 |
| 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： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | LM3445MX |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第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
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
相关PDF资料 |
PDF描述 |
|---|---|
| NPS 2-T126 0.500 OHM 1% | RES .5 OHM 25W 1% DPAK |
| REC3-4815SRW/H4/A/M | CONV DC/DC 3W 36-72VIN 15VOUT |
| P51-1500-S-S-D-5V-000-000 | SENSOR 1500PSIS 1/4 NPT 5V |
| P51-500-S-E-D-4.5OVP-000-000 | SENSOR 500PSI 3/8-24 UNF .5-4.5V |
| RMW-140/42-1200/ADH-0 | HEAT SHRINK TUBING |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM3447-A19-120VEVM | 功能描述:LED 照明开发工具 LM3447 Eval Mod 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: |
| LM3447-A19-230VEVM | 功能描述:LED 照明开发工具 LM3447 Eval Mod 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: |
发布紧急采购，3分钟左右您将得到回复。