GENERAL DESCRIPTION
IS31LT3918 LED driver IC is a peak current detection buck converter which operates in constant off time mode. It operates over a very wide input voltage supply range of 6VDC to 450VDC or 110VAC/220VAC. IS31LT3918 incorporates the special feature of switch dimming by detecting OFF-ON cycles of the main power switch. When the switch is cycled within a 2 second period (typical) the device automatically switches the dimming level to the next step. As a result, dimming can be achieved without replacing any wiring in the original system. 

FEATURES
● User configurable switch dimming levels
● 3% output current accuracy
● Over current, voltage and temperature protection
● High efficiency (typical up to 95%)
● Wide input voltage range: 6VDC~450VDC or
   85Vac~ 265Vac
● Linear and PWM dimming
● Very few external components

APPLICATIONS
● DC/DC or AC/DC constant current LED driver
● Signal and decorative lighting
● Backlight LED driver