Texas Instruments LM3445 Evaluation Board LM3445-230VFLBK/NOPB LM3445-230VFLBK/NOPB Scheda Tecnica
Codici prodotto
LM3445-230VFLBK/NOPB
I
COLL
V+
BR1
VAC
TRIAC
DIMMER
+
+
1
2
3
4
5
6
7
8
9
10
-
V
LED
GND
VCC
FLTR2
ASNS
FLTR1
ISNS
GATE
BLDR
COFF
DIM
LM3445MM
V
LED-
D3
C7
C9
C10
D4
D8
D9
R2
D1
Q1
C5
R5
C12
D2
D10
Q2
L2
Q3
R3
R4
C11
C4
C3
R1
U1
V
BUCK
LINE VOLTAGE (V
AC
)
EF
F
IC
IEN
C
Y
(%
)
95.0
90.0
85.0
80.0
75.0
80
90
100
110
120
130
140
14 Series connected LEDs
10 Series connected LEDs
SNVS570L – JANUARY 2009 – REVISED MAY 2013
Triac Dimmable Offline LED Driver
Check for Samples:
1
FEATURES
DESCRIPTION
The LM3445 is an adaptive constant off-time AC/DC
2
•
Triac Dim Decoder Circuit for LED Dimming
buck (step-down) constant current controller designed
•
Application Voltage Range 80V
AC
– 277V
AC
to be compatible with triac dimmers. The LM3445
•
Capable of Controlling LED Currents Greater
provides a constant current for illuminating high
Than 1A
power LEDs and includes a triac dim decoder. The
dim decoder allows wide range LED dimming using
dim decoder allows wide range LED dimming using
•
Adjustable Switching Frequency
standard triac dimmers. The high frequency capable
•
Low Quiescent Current
architecture allows the use of small external passive
•
Adaptive Programmable Off-Time Allows for
components. The LM3445 includes a bleeder circuit
Constant Ripple Current
to ensure proper triac operation by allowing current
flow while the line voltage is low to enable proper
flow while the line voltage is low to enable proper
•
Thermal Shutdown
firing of the triac. A passive PFC circuit ensures good
•
No 120Hz Flicker
power factor by drawing current directly from the line
•
Low Profile 10-Pin VSSOP Package or 14-Pin
for most of the cycle, and provides a constant positive
SOIC
voltage to the buck regulator. Additional features
include thermal shutdown, current limit and V
include thermal shutdown, current limit and V
CC
•
Patent Pending Drive Architecture
under-voltage lockout.
APPLICATIONS
•
Retro Fit Triac Dimming
•
Solid State Lighting
•
Industrial and Commercial Lighting
•
Residential Lighting
Typical LM3445 LED Driver Application Circuit
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
Copyright © 2009–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.