CoolSET™ quasi-resonant PWM flyback controller

Product Announcement from Infineon Technologies AG

With a patent pending novel quasi-resonant implementation, an intelligent adaptive digital algorithm has enabled the ICE5QRxxxxAx PWM controller to minimize the spread of switching frequency under different AC line input conditions. This innovative approach has enabled SMPS designers to design with higher switching frequency to take advantage of smaller magnetics and lowering of system BOM cost.


  • Fast start-up with cascade configuration
  • Robust SMPS with comprehensive input protection such as line over-voltage protection, brown out, VCC and CS pin short to ground protection
  • Innovative novel quasi-resonant switching scheme for high efficiency and ease of EMI filter design
  • Dual active burst mode entry/exit profile to optimize light load efficiency for different design
  • Minimize interruption to operation with auto-restart scheme

 Learn more on the ICE5QRxxxxAx product family