The UCC28019 8-pin active Power Factor Correction (PFC) controller uses the boost topology operating in Continuous Conduction Mode (CCM). The controller is suitable for systems in the 100 W to >2 kW range over a wide-range universal ac line input. Startup current during under-voltage lockout is less than 200 µA. The user can control low power standby mode by pulling the VSENSE pin below 0.77 V.
●Low-distortion wave-shaping of the input current using average current mode control is achieved without input line sensing, reducing the Bill of Materials component count. Simple external networks allow for flexible compensation of the current and voltage control loops. The switching frequency is internally fixed and trimmed to better than 5% accuracy at 25°C. Fast 1.5-A gate peak current drives the external switch.
●Numerous system-level protection features include peak current limit, soft over-current detection, open-loop detection, input brown-out detection, output over-voltage protection/under-voltage detection, a no-power discharge path on VCOMP, and overload protection on ICOMP. Soft-Start limits boost current during start-up. A trimmed internal reference provides accurate protection thresholds and regulation set-point. An internal clamp limits the gate drive voltage to 12.5 V.
● 8-pin Solution Without Sensing Line Voltage Reduces External Components
● Wide-Range Universal AC Input Voltage
● Fixed 65-kHz Operating Frequency
● Maximum Duty Cycle of 97%
● Output Over/Under-Voltage Protection
● Input Brown-Out Protection
● Cycle-by-Cycle Peak Current Limiting
● Open Loop Detection
● Low-Power User Controlled Standby Mode
● APPLICATIONS
● CCM Boost Power Factor Correction Power Converters in the 100 W to >2 kW Range
● Server and Desktop Power Supplies
● Telecom Rectifiers
● Industrial Electronics
● Home Electronics
