UCC28070PWR Datasheet PDF - TI

●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