LED DRIVER CONTROL IC, SMPS FLYBACK, 8-Pin SOIC, T/R 2.5k

The IRS2982S is a versatile SMPS controller IC primarily intended for LED drivers in the 5 to 100 W power ranges suitable for Buck, Buck-Boost and Flyback converters operating in critical conduction mode (CrCM) and discontinuous mode (DCM) at light loads. Flyback converters will be covered in this application note focusing on an isolated voltage regulated design with PFC.All of the control and protection required for the converter is integrated in the IRS2982S as well as a high voltage start-up cell to enable rapid illumination at switch on over a wide line input voltage range. The IRS2982S is also able to provide power factor correction in a single stage Flyback converter able to meet class C (lighting) line current harmonic limits of the EN61000-3-2 standard.Key FeaturesHigh voltage startup cell (600 V)Fast time to light < 0.5 s while maintaining > 90% efficiencyEliminate external components for voltage dividingCrCM/DCM/burst modes enables wide range operation from standby to 100%Burst mode capabilityAccurate constant voltage/current regulationOptimized one stage PFC + flybackCycle by cycle over-current protectionOpen load over voltage protection

• High voltage fast startup
• Voltage mode control
• Critical-conduction / transition mode operation
• Constant voltage / current regulation
• Minimum off time (DCM at light load)
• Burst mode operation at very light load
• Cycle by cycle over-current protection
• Open load over voltage protection
• Micro-power startup (50µA)
• Low quiescent current
• Latch immunity and ESD protection
• Noise immunity