The document introduces Cirrus Logic's digital power factor correction (PFC) solution. It discusses how PFC works to improve power efficiency by correcting the phase difference between voltage and current waveforms. Cirrus Logic's digital PFC controllers use techniques like variable switching frequency and digital spread spectrum to reduce electromagnetic interference noise and improve efficiency at light loads. The CS1500 and CS1600 are highlighted as examples of Cirrus Logic's digital PFC integrated circuits.