InnoSwitch Family

The InnoSwitch™ Family of ICs combines primary, secondary and feedback circuits in a single surface-mounted off-line flyback switcher IC. The InnoSwitch IC incorporates a high-voltage primary-side switch, the primary-side controller, a secondary-side controller for synchronous rectification and an innovative new FluxLink™ technology that eliminates the need for an optocoupler. InnoSwitch3-Pro enables dynamic control of output voltage and current, along with other configurable protection features, through a simple I²C interface. InnoSwitch Family devices can be used in applications up to 100 W and provide efficiency as high as 95%.

Power Integrations’ FluxLink™ communication technology enables feedback information to be delivered across an isolation barrier without the use of any magnetic materials. FluxLink delivers a very high communication bandwidth which enables a much faster load-transient response. It is also highly reliable and does not suffer from the typical optocoupler degradation mechanisms. It is embedded into the package and by eliminating bulky optocouplers, it saves space and increases power density, which is particularly beneficial for adapters and chargers. Furthermore, this proprietary technology meets all global noise immunity standards. For safety, it complies not only with UL and TUV global isolation standards but also the more stringent CQC 5,000 meter Chinese safety standard.

InnoSwitch3-MX is intended to be used with InnoMux controller IC for multiple output, single-stage power supplies for monitors and TVs. This enables very high system efficiency on a small PCB foot print.

InnoSwitch Family Comparison Table

ProductInnoSwitch3-ProInnoSwitch3-CEInnoSwitch3-CPInnoSwitch3-EPInnoSwitch3-MX
Data Sheet
Power LevelUp to 100 WUp to 65 WUp to 100 WUp to 100 WUp to 50 W
Switch Rating650/725/750 V650 V650/725/750 V725/750/900 V650 V/725 V
Parts Incorporating GaN TechnologyINN3379C
INN3370C
INN3279C
INN3270C
INN3679C
INN3670C
Target Applications

Cable Drop Compensation
Line OV/UV Protection
Output OVP 
Constant Power Profile  
I²C Interface   
Dynamically Adjustable Voltage & Current   
Telemetry Status   
Configurable Protection Features   
Compatible with InnoMux Controller IC