Overview
   TP8621 is a high power factor non-isolated buck LED constant current driver chip with three-stage switch dimming function. The chip integrates a single-stage active power factor correction circuit, which is particularly suitable for high-performance non-isolated buck LED lighting system dimming applications with a full voltage input range of 85VAC~265VAC.

FEATUREs
• Integrated three-stage switch dimming function
• 100%, 50%, 10% dimming brightness
• Built-in single-stage active PFC function
• Low input current total harmonic distortion
• Proprietary closed-loop feedback constant current control
• Quasi-resonant switching mode, low switching loss
• ±3% LED output current accuracy
• Excellent line voltage regulation and load regulation
• Ultra-low startup current
• LED output open circuit protection
• LED output short circuit protection
• VCC power supply overvoltage protection
• VCC power supply undervoltage protection
• CS cycle-by-cycle current limiting
• Automatic restart function
• Chip overtemperature protection
• SOP8L package

APPLICATIONs
• LED bulbs, LED spotlights
• LED fluorescent lamps, LED ceiling lamps
• Other LED lighting