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.
Interleaved average current-mode PWM control with inherent current matching
Advanced current synthesizer current sensing for superior efficiency
Highly-linear multiplier output with internal
Quantized voltage feed-forward correction for near-unity PF
Programmable maximum duty-cycle clamp
Programmable frequency dithering rate and magnitude for enhanced EMI reduction
External-clock synchronization capability
Enhanced load and line transient response through voltage amplifier output slew-rate correction
Programmable peak current limiting
Bias-supply UVLO, overvoltage protection, open-loop detection and PFC-enable monitoring
External PFC-disable interface
Open-circuit protection on VSENSE and VINAC pins
Programmable soft-start
Green product and no Sb/Br
Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.