LED FLYBACK CONTROL IC, 8-pin SOIC T/R

The IRS2983 is a fully integrated, fully protected SMPS control IC designed to drive Flyback converter LED drivers. The IRS2983 features include primary side power regulation, which allows a basic converter to be implemented without the need for an opto isolator in a Flyback LED driver with a fixed load enabling a low cost, high reliability isolated LED driver design to be realized. The IRS2983 may also be used in converters that do include secondary feedback through an opto isolator. Other features of the IRS2983 include a high voltage startup enabling VCC supply to be derived initially from the high voltage DC bus until the auxiliary inductor winding is able to take over. The IRS2983 operates in critical conduction (CrCM) or discontinuous (DCM) modes and is fully protected against open and short circuit as well as inductor saturation. The IRS2983 may be used in single stage Flyback LED drivers with an unsmoothed DC bus to obtain high power factor and low THD.

• Flyback LED Driver
• Critical-conduction / Transition mode operation
• Primary constant power control
• Burst mode operation at light load
• Over-current protection
• Micropower startup (150 ?A)
• Low quiescent current (2.5 mA)
• Latch immunity and ESD protection
• Open load over voltage protection
• Noise immunity