TK5401

TK5401 Application note May,2009 Ver.1.2 TK5401 Application Note (Ver.1.2) Takion Co.,Ltd http://www.takion.jp/ The contents in this document have a case to change without notice. www.DataSheet4U.com Copy Right : Takion.co.,Ltd Page.1 TK5401 Application note May,2009 Ver.1.2 Contents 1.General Description 2.Features 3.Block Diagram 4.Pin Functional Description 5.Package Outline 6.Electrical Characteristics 7.Power Supply IC Circuit Connection Example 8.Functional Description 8.1.Operating Oscillation 8.2.Power supply and Start-up Circuit 8.3.Constant Current Control Circuit 8.4.Adjustment Over Current Protection Circuit 8.5.COMP Pin Function 8.6.Latch Function 8.7.Thermal Shut Down Circuit 8.8.Over Voltage Protection Circuit 9.Application Circuit Example for LED Driver 9.1.Application Circuit Example 1 10.Attentions 3 3 3 4 4 5~7 7 8~9 9~10 11 12 13 13 13 14 15 16~18 www.DataSheet4U.com Copy Right : Takion.co.,Ltd Page.2 TK5401 Application note May,2009 Ver.1.2 1.General Description The TK5401 is a power supply IC for LED driver that had a characteristic to operate without electrolytic capacitors which is necessary for the DC power supply structure. The IC has the high voltage power MOSFET and the control circuit built-in one package. And it is realized miniaturization, low cost by removing electrolytic capacitors. Moreover, it is realized long operating life and high energy efficiency of LED lamp. 2. Features ●Built-in the high voltage power MOSFET（650V / 1.9...