AC-DC Offline LED Driver - LM3444

LM3444 (ACTIVE)

AC-DC Offline LED Driver

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 VCC under-voltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.

Features

  • Application Voltage Range 80VAC – 277VAC
  • 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

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Parametrics Compare all products in LED Lighting - Illumination

 
Input Voltage (Type)
Vin (Min) (V)
Vin (Max) (V)
Iout (Max) (A)
Vout (Min) (V)
Vout (Max) (V)
Regulated Outputs (#)
Topology
Dimming Method
Power Factor Correction (Min)
Type
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Vref (V)
UVLO Thresholds On/Off (V)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM3444
AC/DC    
8    
13    
2    
9    
60    
1    
Buck
Flyback    
Analog    
Active
Passive    
Inductive    
30    
1000    
1.58    
0.75    
6.4 / 5.4    
Adjustable Switch Frequency
Thermal Shutdown    
Catalog    
-40 to 125    
10VSSOP
8SOIC    
0.55 | 1ku    
WEBENCH® LM3444
 
110.00 <=


V in Lower
 V
 
<=


V in Upper
 V
 
<= 270.00
Ambient Temp  °C <= 100
Light Output (optional)  Lumens



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