FEATURES

 Switch mode controller 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

 Available in SOP8 Package

DESCRIPTION

The A9912 is a high voltage buck control IC for constant LED current regulation. The A9912 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 A9912 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.

The A9912 is available in SOP8 package.

APPLICATION

 DC/DC or AC/DC LED driver applications

 RGB backlighting LED driver

 General purpose constant current source

 Signal and decorative LED lighting