LM3444MM Datasheet, PDF (1/30 Pages) Texas Instruments – AC-DC Offline LED Driver

LM3444
www.ti.com
SNVS682C – NOVEMBER 2010 – REVISED MAY 2013
AC-DC Offline LED Driver
Check for Samples: LM3444
FEATURES
1
•2 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 8-Lead
SOIC Package
• Patent Pending Drive Architecture
DESCRIPTION
The LM3444 is an adaptive constant off-time AC/DC
buck (step-down) constant current controller that
provides a constant current for illuminating high
power LEDs. The high frequency capable architecture
allows the use of small external passive components.
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. The LM3444 is available in a low profile 10-
pin VSSOP package or an 8-lead SOIC package.
APPLICATIONS
• Solid State Lighting
• Industrial and Commercial Lighting
• Residential Lighting
TYPICAL LM3444 LED DRIVER APPLICATION CIRCUIT
V+
BR1
R
2
VAC
D
1
D
3
C+
7
D
D
8
4
Q
1
D2
D
9
C
1
C +0
9
C
5
LM344
4
1 NC _U1
NC
1
0
2 NC
VC
C
9
VBUCK
C
1
2
VLED
-
R
4
VLED-
D1
0
Q3
L
2
ICOLL
3
N
C
GAT ₈
E
4
CO
FF
ISN ₇
S
C
5
FILT
ER
G
N6
D
4
Q2
R
3
95.0
90.0
85.0
80.0
75.0
80
14 Series connected LEDs
10 Series connected LEDs
90 100 110 120 130 140
LINE VOLTAGE (V_AC)
C
1
1
1
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2
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.
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