Digital PFC Controller 8-Pin SOIC

The CS1601 is a digital power factor correction (PFC) controllers designed to deliver the lowest PFC system cost in electronic ballast applications. The controller operates in a variable frequency discontinuous conduction mode (VFDCM) with zero-current switching (ZCS) optimized to deliver best-in-class THD and minimize the size and cost of magnetic components. The CS1601 operates at switching frequencies up to 70kHz. The VF-DCM control algorithm varies both duty cycle and frequency. This spreads the EMI frequency spectrum, thus reducing conducted EMI filtering requirements. In addition, the maximum switching frequency is reached at the peak of the AC input, which allows for use of a smaller, more cost-effective boost inductor.The feedback loop is closed through an integrated compensation network within the controller, eliminating the need for additional external components. Protection features such as overvoltage, overcurrent, open and short-circuit protection, overtemperature, and brownout protect he system during abnormal transient conditions.

• Low PFC System Cost
• Best-in-class THD
• Digital EMI Noise Shaping Reduces Conducted EMI
• Adaptive Switching Frequency Control Minimizes Boost Inductor Size
• High Efficiency Due to Zero-current Switching
• Integrated Feedback Compensation Simplifies System Design
• Comprehensive Safety Features
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection
  • Cycle-by-cycle Current Limiting
  • Input Voltage Brownout Protection
  • Open/Short Loop Protection for IAC & IFB Pins
  • Thermal Shutdown
• Pin placement similar to traditional boundary mode (CRM) Controllers