The SIC9802 is a high precision primary-side regulation isolated flyback controller with single-stage Active PFC, specially designed for offline constant current LED lighting. The controller with on-chip PFC circuit operates in critical conduction mode to achieve high power factor and reduce the power MOSFET switching loss. Using proprietary current sensing scheme,the controller can 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 startup and LED turn on.
The SIC9802 uses 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.
The SIC9802 offers 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 SIC9802 is available in SOP-8 package.
· Single-Stage Active PFC for High Power Factor and Low THD . Primary Side Control Constant Current Operation
. Ultra Fast LED Turn On( <200ms @85Vac) . ±3% LED Current Accuracy
. Excellent Line and Load Regulation . Critical Conduction Mode Operation
. Source Driver Structure for Improved Efficiency . High Resistance Feedback Resistor for Improved Efficiency
. Ultra-Low (30μA) Start up Current . Ultra-Low (800μA) 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 . Over Temperature Protection
. Auto Recovery
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