UCC28070A

• 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
• Extended Range 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, Overvoltage Protection,
  Open-Loop Detection, and PFC-Enable Monitoring
• External PFC-Disable Interface
• Open-Circuit Protection on VSENSE and
  VINAC pins
• Programmable Soft Start

The UCC28070A device is an extended frequency range derivative of the UCC28070 device, capable of operating at low switching frequencies desired for IGBT power-switch based PFC converters in high-power applications.

The UCC28070A device is capable of operating at frequencies from 10 kHz to 300 kHz, thus extending the range of operation compared to the UCC28070 device whose minimum operating frequency was limited to 30 kHz. All the other features and benefits of the UCC28070 device are also available in the UCC28070A device. The 180° out-of-phase interleaved operation generates substantial reduction in input and output ripple currents and conducted EMI filtering becomes easier and less expensive.

Like the UCC28070 device, the UCC28070A device also features multiple innovations including current synthesis and quantized voltage feedforward 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. All protection features in the UCC28070 device such as output overvoltage detection, programmable peak-current limit, undervoltage lockout, and open-loop protection are available in the UCC28070A device as well.