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說明

The UCC28510 series of combination PFC/PWM controllers provide complete control functionality for any off-line power system requiring compliance with the IEC1000–3–2 harmonic reduction requirements. By combining the control and drive signals for the PFC and the PWM stages into a single device, significant performance and cost benefits are gained. By managing the modulation mechanisms of the two stages (leading-edge modulation for PFC and trailing-edge modulation for PWM), the ripple current in the boost capacitor is minimized.

Based on the average current mode control architecture with input voltage feedforward of prior PFC/PWM combination controllers, these devices offer performance advantages. Two new key PWM features are programmable maximum duty cycle and the 2x PWM frequency options to the base PFC frequency.

特性

• Provides Control of PFC and PWM Power Stages In One Device
• Leading-Edge PFC, Trailing-Edge PWM Modulation for Reduced Ripple
• Built-In Sequencing of PFC and PWM Turn-On
• 2-A Source and 3-A Sink Gate Drive for Both PFC and PWM Stages
• Typical 16-ns Rise Time and 7-ns Fall Time into 1-nF Loads
• PFC Features
  • Average-Current-Mode Control for Continuous Conduction Mode Operation
  • Highly-Linear Multiplier for Near-Unity Power Factor
  • Input Voltage Feedforward Implementation
  • Improved Load Transient Response
  • Accurate Power Limiting
  • Zero Power Detect
• PWM Features
  • Peak-Current-Mode Control Operation
  • 1:1 or 1:2 PFC:PWM Frequency Options
  • Programmable maximum duty cycle
  • Programmable Soft-Start
  • Two Hysteresis Options for Differing Hold-Up Time Requirements