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This literature is subject to all applicable copyright laws and is not for resale in any manner.FL663 Primary-Side-Regulation PWM Controller for LED Illumination June 2015 FL663 Primary-Side-Regulation PWM Controller for LED Illumination Features Description Low Standby Power: < 30 mW This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides features High-Voltage Startup to enhance the performance of LED illumination. Few External Component Counts The proprietary topology, TRUECURRENT , enables Constant-Voltage (CV) and Constant-Current (CC) precise CC regulation and simplified circuit for LED Control without Secondary-Feedback Circuitry illumination applications. The result is lower-cost and smaller LED lighting compared to a conventional design Green-Mode: Linearly-Decreasing PWM Frequency or a linear transformer. with Cycle skipping. To minimize standby power consumption, the Fixed PWM Frequency at 50 kHz and 33 kHz with proprietary green-mode function provides off-time Proprietary Frequency Hopping to Solve EMI modulation to linearly decrease PWM frequency with Problems cycle skipping under light-load conditions. Green mode Peak-Current-Mode Control in CV Mode assists the power supply in meeting the power conservation requirements. Cycle-by-Cycle Current Limiting By using the FL663, LED illumination can be V Over-Voltage Protection (OVP) DD implemented with few external components and V Under-Voltage Lockout (UVLO) DD minimized cost. Adjustable Brownout Detector Gate Output Maximum Voltage Clamped at 15 V Thermal Shutdown (TSD) Protection Available in the 8-Lead SOIC Package Applications Figure 1. 8-Lead SOIC LED Illumination Battery chargers for cellular phones, cordless phones, PDA, digital cameras, power tools Ordering Information Operating Packing Part Number Top Mark Package Temperature Range Method FL663MX -40C to +125C FL663 8-Lead, Small-Outline Package (SOIC-8) Tape & Reel 2015 Fairchild Semiconductor Corporation www.fairchildsemi.com FL663 Rev. 1.0