Data Sheet (LM3444-120VFLBK/NOPB)Table of ContentsFEATURES1APPLICATIONS1DESCRIPTION1TYPICAL LM3444 LED DRIVER APPLICATION CIRCUIT1Connection Diagrams2ABSOLUTE MAXIMUM RATINGS3RECOMMENDED OPERATING CONDITIONS3ELECTRICAL CHARACTERISTICS4TYPICAL PERFORMANCE CHARACTERISTICS5SIMPLIFIED INTERNAL BLOCK DIAGRAM7APPLICATION INFORMATION8FUNCTIONAL DESCRIPTION8Theory of Operation8VALLEY-FILL CIRCUIT8VALLEY-FILL OPERATION9BUCK CONVERTER10OVERVIEW OF CONSTANT OFF-TIME CONTROL11THERMAL SHUTDOWN12Design Guide12DETERMINING DUTY-CYCLE (D)12CALCULATING OFF-TIME12SETTING THE SWITCHING FREQUENCY13INDUCTOR SELECTION14SETTING THE LED CURRENT16VALLEY FILL CAPACITORS17OUTPUT CAPACITOR19SWITCHING MOSFET19RE-CIRCULATING DIODE19Design Example19LM3444 Design Example 1 Input = 90VAC to 135VAC, VLED = 7 x HB LED String Application at 400 mA21Revision History23Size: 965 KBPages: 30Language: EnglishOpen manual
