LM3444_15 Datasheet, PDF (1/27 Pages) Texas Instruments – AC-DC Offline LED Driver

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LM3444
SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015
LM3444 AC-DC Offline LED Driver
1 Features
•1 Application Voltage Range: 80 V_AC to 277 V_AC
• Capable of Controlling LED Currents
Greater than 1 A
• Adjustable Switching Frequency
• Low Quiescent Current
• Adaptive Programmable Off-Time Allows for
Constant Ripple Current
• Thermal Shutdown
• No Flicker at 120 Hz
• Low-Profile 10-Pin VSSOP Package
or 8-Lead SOIC Package
• Patented Drive Architecture
2 Applications
• Solid State Lighting
• Industrial and Commercial Lighting
• Residential Lighting
SPACE
Typical LM3444 LED Driver Application Circuit
V+
D3
VBUCK
BR1
C7 ⁺
D9
C10
R2
D4
D8 _{C9 +}
VLED
C12
- R4
VAC
Q1
D1
D2
C5
VLED-
D10
Q3
L2
LM3444
1 NC _U1 NC 10
2 NC
VCC 9
ICOLL
3 NC
GATE ⁸
Q2
3 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
undervoltage lockout. The LM3444 is available in a
low profile 10-pin VSSOP package or an 8-lead SOIC
package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3444
VSSOP (10)
SOIC (8)
3.00 mm × 3.00 mm
3.91 mm × 4.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Line Voltage
95.0
14 Series connected LEDs
90.0
85.0
10 Series connected LEDs
80.0
75.0
80
90 100 110 120 130 140
LINE VOLTAGE (V_AC)
4 COFF
ISNS ⁷
5 FILTER
GND 6
R3
C4
C11
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.