LN2542

85~265V AC Input LED Constant Current Driver LN2542 ■ General Description The LN2542 is a high voltage buck control IC for constant LED current regulation. The LN2542 operates constant off-time mode. It allow efficient operation of High Brightness (HB) LEDs from voltage sources ranging from 8VDC up to 450VDC or 110VAC/220VAC. The LN2542 includes a PWM dimming input that can accept an external control signal with a duty ratio of 0 100% and a frequency of up to a few kilohertz, and the dimming also accept a 0-1.2V linear input signal. The RNTC pin can accept a 0-250mV Line Dimming input witch be used for temperature compensation of the LED current. LN2542 is available by SOP-8 packages. ■ Applications  DC/DC or AC/DC LED driver applications  RGB backlighting LED driver  General purpose constant current source  Signal and decorative LED lighting ■ Typical Application Circuit ■ Features  Switch mode constroller for single switch LED Drivers  Open loop peak current controller  Wide Input range from 8VDC~450VDC or 110VAC/220AC  Application from a few mA to more than 1A output  Up to hundreds of LEDs  Constant off-time operation  Linear and PWM dimming capability  Requires few external components for operation  Temperature compensation to regulate LED current ■ Package  SOP-8 fuse AC220V IN4007*4 10uF/400V IN4007 IN4007 IN4007 10uF/400V R1 10uF/16V HER207 LEDs 5mH LN2542 RNTC VIN DIM GATE 2N60 VREF CS R2 RNTC TOFF GND Rcs Rosc Note： 1、R1 is base...