Reference Designs
Valley switching boost power factor correction (PFC) reference design
Texas Instruments
This reference design illustrates a digital control method to significantly improve Boost Power Factor Correction (PFC) converter performance such as the efficiency and Total Harmonic Distortion (THD) under light load condition where efficiency and THD standards are difficult to meet. This is achieved using the integrated digital control feature of the Piccolo™ F280049 microcontroller (MCU). The design supports phase shedding: valley switching: valley skipping: and Zero Voltage Switching (ZVS) for different load and instantaneous input voltage conditions. The software available with this reference design accelerates time to market.
Features
- Interleaved: 750 W: Two-Phase Boost PFC Stage. Full Range Parameter: 95–260 Vrms: 47–63 Hz200-kHz Switching Frequency Under Normal Conditions (Load > 10%)140–330-kHz Variable Pulse Width Modulation (PWM) Switching Under Light Load (Programmable Valley Switching and Valley SkippingLow THD: 6% at 5% Load (Low Line); 7% at 5% Load (High Line)High Efficiency > 92% at 5% Load
Applications
- Rack & server PSU with 48-V output
- Merchant telecom rectifiers
- Single phase line interactive UPS
- 1-phase AC-analog control
- DC-fast charging
- Server PSU with 12-V output
Product Categories
- C2000 real-time microcontrollers
End Equipment Reference Diagrams
Application Area
End Equipment
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