NOTICE - The following device(s) are recommended alternatives:

The ISL6731A and ISL6731B are active power factor correction (PFC) controller ICs that use a boost topology. The controllers are suitable for AC/DC power systems up to 2kW and over the universal line input. The ISL6731A and ISL6731B operate in Continuous Current Mode (CCM). Accurate input current shaping is achieved with a current error amplifier. A patent pending breakthrough negative capacitance technology minimizes zero crossing distortion and reduces the magnetic components size. The small external components result in lower design cost without sacrificing performance. The internally clamped 12.5V gate driver delivers 1.5A peak current to the external power MOSFET. The ISL6731A and ISL6731B provide a highly reliable system that is fully protected. Protection features include cycle-by-cycle overcurrent, over power limit, over-temperature, input brownout, output overvoltage and undervoltage protection. The ISL6731A and ISL6731B provide excellent power efficiency and transitions into a power saving skip mode during light load conditions, thus improving efficiency automatically. The ISL6731A and ISL6731B can be shut down by pulling the FB pin below 0.5V or grounding the BO pin. Two switching frequency options are provided. The ISL6731B switches at 62kHz, and the ISL6731A switches at 124kHz.


  • Reduced component size requirements
  • Enables smaller, thinner AC/DC adapters
  • Choke and cap size can be reduced
  • Lower cost of materials
  • Excellent power factor and THD over line and load
  • CCM mode with negative capacitance generator for smaller EMI filter and improved performance
  • Built-in current amplifier with flexibility of gain change
  • Better light-load efficiency
  • Automatic pulse skipping with programmable threshold
  • Programmable or automatic shutdown
  • Highly reliable design
  • Cycle-by-cycle current limit
  • Input average power limit
  • OVP and OTP protection
  • Input brownout protection
  • Small 14 Ld SOIC package


  • Desktop computer AC/DC adaptor
  • Laptop computer AC/DC adaptor
  • TV AC/DC power supply
  • AC/DC brick converters


Title language Type Format File Size Date
star ISL6731A, ISL6731B Datasheet Datasheet PDF 1001 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
ISL6731AEVAL2Z User Guide Guide PDF 610 KB
ISLACDC750WEVKIT1Z Evaluation Kit User Guide Manual - Development Tools PDF 2.25 MB


memoryBoards & Kits

Part Number Title Type Company
ISLACDC750WEVKIT1Z Boost PFC and Asymmetrical Full-Bridge ZVS Converter Evaluation Kit Evaluation Renesas