UCC28070PWR

CCM PFC控制器

DESCRIPON

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