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LM3445
www.ti.com
SNVS570L – JANUARY 2009 – REVISED MAY 2013
Triac Dimmable Offline LED Driver
Check for Samples: LM3445
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FEATURES
DESCRIPTION
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Triac Dim Decoder Circuit for LED Dimming
Application Voltage Range 80V AC – 277V AC
Capable of Controlling LED Currents Greater
Than 1A
Adjustable Switching Frequency
Low Quiescent Current
Adaptive Programmable Off-Time Allows for
Constant Ripple Current
Thermal Shutdown
No 120Hz Flicker
Low Profile 10-Pin VSSOP Package or 14-Pin
SOIC
Patent Pending Drive Architecture
The LM3445 is an adaptive constant off-time AC/DC
buck (step-down) constant current controller designed
to be compatible with triac dimmers. The LM3445
provides a constant current for illuminating high
power LEDs and includes a triac dim decoder. The
dim decoder allows wide range LED dimming using
standard triac dimmers. The high frequency capable
architecture allows the use of small external passive
components. The LM3445 includes a bleeder circuit
to ensure proper triac operation by allowing current
flow while the line voltage is low to enable proper
firing of the triac. A passive PFC circuit ensures good
power factor by drawing current directly from the line
for most of the cycle, and provides a constant positive
voltage to the buck regulator. Additional features
include thermal shutdown, current limit and V CC
under-voltage lockout.
APPLICATIONS
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Retro Fit Triac Dimming
Solid State Lighting
Industrial and Commercial Lighting
Residential Lighting
Typical LM3445 LED Driver Application Circuit
V+
D3
V BUCK
95.0
C7
+
D9
14 Series connected LEDs
BR1
R2
D4
D8
C9
+
C10
C12
V LED
-
R4
90.0
TRIAC
DIMMER
VAC
D1
Q1
R5
D2
C5
D10
V LED-
L2
Q3
85.0
80.0
10 Series connected LEDs
LM3445MM
1 ASNS
U1
BLDR 10
R1
2 FLTR1
VCC 9
I COLL
75.0
80
90
100
110
120
130
140
C3
3 DIM
GATE 8
Q2
LINE VOLTAGE (V AC )
4 COFF
ISNS 7
5 FLTR2
GND 6
R3
C4
C11
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright ? 2009–2013, Texas Instruments Incorporated
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