InnoSwitch3 family of flyback switcher ICs achieve up to 94% efficiency

By Alix Paultre, contributing editor

Power Integrations, a leader in high-voltage integrated circuits for energy-efficient power conversion, released the InnoSwitch3 family of offline CV/CC flyback switcher ICs, which achieve up to 94% efficiency across line and load conditions, slashing power supply losses by a further 25% and enabling the development of compact power supplies up to 65 W without heatsinks. InnoSwitch3 devices are ideal for power supplies with challenging energy consumption, footprint, or thermal constraints, particularly those targeting mandatory Total Energy Consumption specifications.
These newest flyback switcher ICs employ the company’s isolated digital communications technology, FluxLink, as well as 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 11.5-mm creepage and clearance between primary and secondary sides for high reliability, surge, and ESD robustness.

The devices also incorporate a host of protection features, including lossless line overvoltage and undervoltage, output overvoltage, overpower, overcurrent, and overtemperature 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).

InnoSwitch3 ICs target adapters and open-frame power supplies for consumer, computer, communication, and industrial applications. InnoSwitch3-CP and InnoSwitch3-CE IC samples are available now, priced at $1.11 (CE) and $1.15 (CP), in 10,000-piece quantities. InnoSwitch3-EP parts will be available in November 2017 at $1.18 per 10,000 pieces.