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| 型号： | LM3445-220VEVAL/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 16/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LM3445 220V |
| 标准包装： | 1 |
| 系列： | PowerWise® |
| 特点： | 可调光 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM3445 |
| 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： | *LM3445-220EVAL LM3445-220VEVAL |
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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 |
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| 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 |
| LM3445-EDSNEV/NOPB | 功能描述:LED 照明开发工具 LM3445-EDSN 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: |
| LM3445EVM-695 | 功能描述:LM3445 1, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 电流 - 输出/通道:500mA 输出和类型:1，非隔离 电压 - 输出:- 特性:可调光 电压 - 输入:90 ~ 135 VAC 所含物品:板 使用的 IC/零件:LM3445 标准包装:1 |
| LM3445M | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Triac Dimmable Offline LED Driver |
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