UCC28070 Datasheet PDF

●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