Offline Flyback switcher IC delivers 94% efficiency
The InnoSwitch 3 family of offline CV/CC flyback switcher ICs enable the development of compact power supplies up to 65W without heatsinks and are well suited for power supplies with challenging energy consumption, footprint or thermal constraints, striving to comply with EU CoC v5 Tier 2 specifications. The ICs employ Power Integrations’ proprietary isolated digital communications technology, FluxLink, plus synchronous rectification, quasi-resonant switching and a precise secondary-side feedback sensing and control circuit.
This results in highly efficient, accurate, reliable power supply circuits without the need for optocouplers. InnoSwitch3 devices are CCC, UL and VDE safety-certified to bridge the isolation barrier, and the InSOP-24 package provides a low-profile, thermally efficient solution with extended 11.5mm creepage and clearance between primary and secondary sides for high reliability, surge and ESD robustness.
The devices also incorporate a number of protection features, including lossless line overvoltage and under-voltage, output overvoltage, over-power, over-current and over-temperature protection, as well as output rectifier short-circuit protection. Device sub-families are provided with either latching or auto-recovery capability, according to the typical demands of each target application space. All InnoSwitch3 ICs feature on-board high-voltage MOSFETs (rated at 650 V for the CP and CE series and 725 V for the EP series).
The new ICs are optimized into three application-specific series: CE, CP and EP. The CE or Current External version deliver accurate CC/CV regulation with external output current sense for optimum design flexibility. It targets compact single-voltage chargers, adapters, IoT and building automation. The CP or Constant Power version is aimed at USB Power Delivery (PD), rapid charging and other applications where a dynamic output voltage is required. Then the EP or Embedded Power series features the family’s highest-rated MOSFET (725V) and provides full line and load protection with excellent multi-output cross-regulation for demanding industrial applications and appliances.
To help designers choose the right part among the many different possible configurations, Power Integration hosts a online selection tool as well as technical support with the PI Expert Online design tool.
Power Integrations – www.power.com
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