UCC28070DW

Description
The UCC28070DWR is a 2-phase Interleaved CCM PFC Controller 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 and the conducted-EMI filtering becomes 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.
The UCC28070 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.
Features Interleaved average current-mode PWM control with inherent current matchingAdvanced current synthesizer current sensing for superior efficiencyProgrammable frequency (30 to 300kHz)Programmable maximum duty-cycle clampProgrammable frequency dithering rate and magnitude for enhanced EMI reductionExternal clock synchronization capabilityEnhanced load and line transient response through voltage amplifier output slew-rate correctionProgrammable peak current limitingBias-supply UVLO, over-voltage protection, open-loop detection and PFC-enable monitoringExternal PFC-disable interfaceOpen-circuit protection on VSENSE and VINAC pinsProgrammable soft-startGreen product and no Sb/Br Application Power ManagementCommunications & NetworkingIndustrial