The SIC9866/SIC9867 are high precision primary-side regulation isolated flyback controller with single-stageActive PFC, specially designed for offline constant current LED lighting. The controller with on-chip PFC circuit operates in CCM (Critical Conduction Mode) to achieve high power factor and reduce the power
MOSFET switching loss. The controller precisely control the LED current without secondary side sense and
feedback circuit including opto-coupler. It uses source driver architecture and pending internal charging circuit for low primary side switching loss, ultra fast VDD start up and LED turn on.
The SIC9866/SIC9867 use compensation method to achieve excellent line regulation, and it still can be tuned externally for flexibility.The controller also has outstanding load regulation for driving wide range of LED numbers. 700V power MOSFET is integrated, which can significantly simplify the design of LED lighting system.
The SIC9866/SIC9867 offer rich protection functions to improve the system reliability, including LED short
circuit protection, LED open circuit protection, VDD over voltage protection, VDD under voltage protection, ISEN resistor short circuit protection, ISEN resistor open circuit protection, cycle-by-cycle current limit and die over-temperature protection.All the protection features are auto-recovery.
The SIC9866/SIC9867 are available in SOP-8 & DIP-7 package.
· Single-Stage Active PFC for High Power Factor and Low THD . Primary Side Control Constant Current Operation
. No Opto-Coupler Required . Bulit-in 700V Power MOSFET
. ±3% LED Current Accuracy . Excellent Line and Load Regulation
. Critical Conduction Mode Operation . Gate Driver Structure for Improved Efficiency
. High Resistance Feedback Resistor for Improved Efficiency . Ultra-Low Start up Current
. Ultra-Low Operating Current . LED Short and Open Circuit Protection
. ISEN Resistor Short and Open Circuit Protection . Transformer Saturation Protection
. Cycle-by-Cycle Current Limit . VDD Over-voltage and Under-voltage Protection
. Auto Recovery . Over Temperature Protection
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