Texas Instruments LM3444
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. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.| Part No. | LM3444 |
|---|---|
| Datasheet | LM3444 Download |
| Manufacturer |  Texas Instruments |
| Description | AC-DC Offline LED Driver |
| Buy | Stock & Price |
FEATURES
●1 Application Voltage Range: 80 VAC to 277 VAC● 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 VLEDD10 Q3 LM3444 L2 1 NC U1 NC 10 2 NC VCC 9 ICOLL 3 NC GATE 8 Q2 3
DESCRIPTION
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 VCC undervoltage lockout. 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.
