DESCRIPTION
●The UCC28070 is an advanced power factor correction 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, 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.
●FEATURES
●• 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 (10 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, Over-Voltage Protection, Open-Loop Detection, and PFC-Enable Monitoring
●• External PFC-Disable Interface
●• Open-Circuit Protection on VSENSE and VINAC pins
●• Programmable Soft Start
●• 20-Lead TSSOP Package
