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說明

The UCC28810 and UCC28811 are general lighting power controllers for low to medium power lumens applications requiring power factor correction and EMC compliance. It is designed for controlling a flyback, buck or boost converter operating in critical conduction mode. It features a transconductance voltage amplifier for feedback error processing, a simple current reference generator 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 critical conduction mode operation, the PWM circuit is self-oscillating with the turn-on being governed by a transformer zero energy detector (TZE pin) and the turn-off being governed by the current sense comparator.

特性

• Transition Mode Controller for Low Implementation Cost of AC Input LED Lighting Applications
• Implements Single Stage Power Factor Corrected LED Driver
• Enhanced Transient Response With Slew-Rate Comparator
• Interfaces with Traditional Wall Dimmers
• 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
  • AC Input General Lighting Applications Using HB LEDs
  • Industrial, Commercial and Residential Lighting Fixtures
  • Outdoor Lighting: Street, Roadway, Parking, Construction and Ornamental LED Lighting Fixtures