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LM3445M/NOPB Datasheet(PDF) 18 Page - Texas Instruments

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Part # LM3445M/NOPB
Description  TRIAC Dimmable Offline LED Driver
PDF  42 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3445M/NOPB Datasheet(HTML) 18 Page - Texas Instruments

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1
2
3
4
5
6
7
8
9
10
GND
VCC
FLTR2
ASNS
FLTR1
ISNS
GATE
BLDR
COFF
DIM
LM3445MM
V+
D1
D2
R2
Q1
R5
C5
U1
C4
C3
R1
R11
Q5
R12
R13
C14
C13
BAS40
1
2
3
4
5
6
7
8
9
10
GND
VCC
FLTR2
ASNS
FLTR1
ISNS
GATE
BLDR
COFF
DIM
LM3445MM
V+
D1
D2
R2
Q1
R5
C5
U1
C4
R11
MASTER-
BUCK
SLAVE
BUCK
R10
MASTER LM3445
SLAVE LM3445
MASTER-VBUCK
SLAVE-VBUCK
MASTER/
SLAVE
CIRCUIT
MASTER
DIM CTRL
MASTER
VCC CTRL
TP18
TP19
TP10
TP17
D11
LM3445
SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015
www.ti.com
Feature Description (continued)
•
Tie TP14 (FLTR1) to VCC
7.3.18 Master/Slave 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)
7.3.19 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 (2.5 V) 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.
7.3.20 Master/Slave Connection Diagram
Figure 20. Master Slave Configuration
18
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Copyright © 2009–2015, Texas Instruments Incorporated
Product Folder Links: LM3445



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