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.
