UCC28070PW

IC, PFC CONTROLLER 20-TSSOP.

The UCC28070PW is a two-phase interleaved current-mode Power Factor Correction (PFC) Controller with extended frequency range that integrates two pulse-width modulators (PWMs) operating 180° out of phase. This interleaved PWM operation generates substantial reduction in the input and output ripple currents, allowing the conducted-EMI filtering to become easier and less expensive. A significantly improved multiplier design provides a shared current reference to two independent current amplifiers that ensures matched average-current-mode control in both PWM outputs while maintaining a stable, low-distortion, sinusoidal input-line current. It contains multiple innovations including current synthesis and quantized voltage feed-forward to promote performance enhancements in PF, efficiency, THD and transient response. Features including frequency dithering, clock synchronization and slew rate enhancement further expand the potential performance enhancements.