FL663: Primary-Side-Regulation PWM Controller for LED Illumination

This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides features to enhance the performance of LED illumination.

The proprietary topology, TRUECURRENT®, enables precise CC regulation and simplified circuit for LED illumination applications. The result is lower-cost and smaller LED lighting compared to a conventional design or a linear transformer.

To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency with cycle skipping under light-load conditions. Green mode assists the power supply in meeting the power conservation requirements. By using the FL663, LED illumination can be implemented with few external components and minimized cost.

Features

• Low Standby Power: < 30 mW
• High-Voltage Startup
• Few External Component Counts
• Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
• Green-Mode: Linearly-Decreasing PWM Frequency with Cycle Skipping
• Fixed PWM Frequency at 50 kHz and 33 kHz with Proprietary Frequency Hopping to Solve EMI Problems
• Peak-Current-Mode Control in CV Mode
• Cycle-by-Cycle Current Limiting
• V_DD Over-Voltage Protection (OVP)
• V_DD Under-Voltage Lockout (UVLO)
• Adjustable Brownout Detector
• Gate Output Maximum Voltage Clamped at 15 V
• Thermal Shutdown (TSD) Protection
• Available in the 8-Lead SOIC Package