illustrate

The UCC28510 series of combined PFC/PWM controllers provides complete control functions for any offline power required with IEC1000-3-2 harmonic reduction systems. By combining the control and drive signals of PFC and PWM stages into a single device, significant performance and cost advantages are beneficial. The ripple current in the boost capacitor is minimized by managing the two-stage mechanism of modulation (for PFC-leading modulation and PWM modulation with trailing edge).

Based on an average current mode control architecture, the input voltage is fed forward by the PFC/PWM combo controller, which provides performance benefits to these devices. Two new key features are programmable PWM maximum duty cycle and the option base PFC frequency of 2 PWM frequencies.

characteristic

• The PFC and PWM power stages are controlled in one device
• Leading edge PFC, trailing edge PWM modulation reduces ripple
• Built-in PFC and PWM sequencing turned up
• 2, Source and 3 Sink are suitable for PFC and PWM gate drive in both stages
• A typical rise time of 16 - ns and a fall time of 7 ns are 1 - NF load
• Features of PFC
  • Continuous conduction mode operation for average current mode control
  • High linear multiplier has a power factor of nearly 1
  • Input voltage feed-forward implementation
  • Improved load transient response
  • Precise power limiting
  • Zero power detection
• Features of PWM
  • Peak current mode control operation
  • 1:1 or 1:2 PFC:PWM frequency options
  • Programmable maximum duty cycle
  • Programmable soft-start
  • Two different hold-time requirement hysteresis options