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LM3445M Datasheet(PDF) 7 Page - Texas Instruments

Part # LM3445M
Description  Triac Dimmable Offline LED Driver
PDF  39 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3445M Datasheet(HTML) 7 Page - Texas Instruments

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BRIGHT
DIM
MAINS AC
R1
250 kÖ
DIAC
LOAD
R2
3.3 kÖ
C1
100 nF
TRIAC
LM3445
7.2V
VCC UVLO
S
R
Q
PWM
I-LIM
1.27V
ISNS
ASNS
COFF
MOSFET
DRIVER
GND
FLTR1
FLTR2
DIM
VCC
ANGLE DETECT
BLEEDER
DIM DECODER
1.276V
4.9V
RAMP
0V to 4V
THERMAL
SHUTDOWN
50k
370k
1k
RAMP GEN.
5.9 kHz
3V
1V
INTERNAL
REGULATORS
750 mV
33:
125 ns
LEADING EDGE BLANKING
Tri-State
COFF
LATCH
CONTROLLER
START
4 Ps
BLDR
230
GATE
LM3445
www.ti.com
SNVS570L – JANUARY 2009 – REVISED MAY 2013
SIMPLIFIED INTERNAL BLOCK DIAGRAM
Figure 11. Simplified Block Diagram
APPLICATION INFORMATION
FUNCTIONAL DESCRIPTION
The LM3445 contains all the necessary circuitry to build a line-powered (mains powered) constant current LED
driver whose output current can be controlled with a conventional triac dimmer.
OVERVIEW OF PHASE CONTROL DIMMING
A basic "phase controlled" triac dimmer circuit is shown in Figure 12.
Figure 12. Basic Triac Dimmer
Copyright © 2009–2013, Texas Instruments Incorporated
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