The UCC28070 is an advanced power factor correction (PFC) device 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.
●The UCC28070 device 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.
●The UCC28070 device also contains a variety of protection features including output-overvoltage detection, programmable peak-current limit, undervoltage lockout, and open-loop protection.
● 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 Frequency from 30 kHz to 300 kHz
● Programmable Maximum Duty-Cycle Clamp
● Programmable Frequency-Dithering Rate and
●Magnitude for Enhanced EMI Reduction
● Magnitude: 3 kHz to 30 kHz
● Rate: Up to 30 kHz
● 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
