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說明

The UCC38050 and UCC38051 are PFC controllers for low-to-medium power applications requiring compliance with IEC 1000-3-2 harmonic reduction standard. It is designed for controlling a boost preregulator operating in transition mode (also referred to as boundary conduction mode or critical conduction mode operation). It features a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional to the input voltage, a current-sense (PWM) comparator, PWM logic and a totem-pole driver for driving an external FET.

In the transition mode operation, the PWM circuit is self-oscillating with the turn-on being governed by an inductor zero-current detector (ZCD pin) and the turn-off being governed by the current-sense comparator.

特性

• Transition Mode PFC Controller for Low
  Implementation Cost
• Industry Pin Compatibility With Improved
  Feature Set
• Improved Transient Response With
  Slew-Rate Comparator
• Zero Power Detect to Prevent OVP During
  Light Load Conditions
• Accurate Internal V_REF for Tight Output
  Regulation
• Two UVLO Options
• Overvoltage Protection (OVP),
  Open-Feedback Protection and Enable
  Circuits
• ± 750-mA Peak Gate Drive Current
• Low Start-Up and Operating Currents
• Lead (Pb)-Free Packages
• APPLICATIONS
  • Switch-Mode Power Supplies for Desktops,
    Monitors, TVs and Set Top Boxes (STBs)
  • AC Adapter Front-End Power Supplies
  • Electronic Ballasts