Offline power converters offer very high efficiency and power density

Power Integrations

InnoSwitch3 portfolio from Power Integrations includes products optimized for chargers, small and smart consumer devices, and high-voltage automotive systems

Power Integrations has extended its InnoSwitch™3 portfolio of offline switcher ICs, adding new, highly efficient converters for small consumer devices, automotive devices with a 1,700 V rating, and optimized products for fast-charging power adapters.


InnoSwitch3 offline power converters can be used to supply loads up to 100 W in an enclosed power adapter without requiring a heat-sink. The converters offer increased efficiency of up to 95% across the full load range after Power Integrations replaced silicon transistors with high-voltage gallium nitride (GaN) transistors based on PowiGaN™ technology on the primary side of the IC, reducing conduction and switching losses.


The very high efficiency of the InnoSwitch3 products enables manufacturers of fast-charging USB Power Delivery (PD) power adapters to reduce the size of their products and achieve very high power density. The InnoSwitch3-PD simplifies the development and manufacturing of USB-PD power supplies by integrating the primary switch and controller, isolated feedback, secondary control and USB-PD controller into a single package. The InnoSwitch3-PD family is backed by various reference designs for USB PD chargers, together with the PI Expert™ automated design tool and technical support documentation.


The Power Integrations InnoSwitch3 family also includes the InnoSwitch3-TN family, which increases the efficiency of auxiliary power supplies used in appliances, consumer products and industrial applications. Ideal for both isolated and non-isolated designs, this advanced flyback controller can achieve up to 90% full load efficiency, flat efficiency across the load range, and very low no-load consumption. The InnoSwitch3-TN may be used as an accurate 5 V single-output power supply with two positive rails, or with both positive and negative rails.


For high-voltage automotive applications, the InnoSwitch3-AQ family of converters features a 1,700 V-rated silicon carbide (SiC) power switch. The InnoSwitch3-AQ simplifies the design and production of flyback power converters, particularly those requiring high efficiency and/or small size. The InnoSwitch3-AQ family combines primary and secondary controllers and safety-rated feedback into a single IC, allowing accurate output-voltage regulation over a wide input-voltage range of 30 V to 1,000 V dc.


The InnoSwitch3 architecture incorporates a novel inductive coupling feedback scheme, FluxLink™, which enables accurate drive information to be delivered across an isolation barrier without the use of an optocoupler. FluxLink provides fast communication, giving an almost instantaneous response to load transients.


This proprietary technology meets all global noise immunity standards. For safety, it complies with UL and TUV global isolation standards as well as the CQC 5,000 meter Chinese safety standard.

Product Name


Maximum Breakdown Voltage

Power Level


For automotive applications

750 V, 900 V, 1,700 V

70 W


Offline systems consuming up to 65 W

650 V

65 W


Offline systems requiring constant-power profile

650 V, 725 V, 750 V

100 W


Offline systems consuming up to 100 W

725 V, 750 V, 900 V

100 W


Offline power supplies with multiple outputs for LED displays

650 V, 725 V, 750 V

85 W


For USB Type-C PD systems

750 V, 650 V

100 W


Offline flyback switcher IC

725 V

21 W


Digitally controllable offline programmable power supply

650 V, 725 V, 750 V

100 W

Features: InnoSwitch3-TN

  • Less than 5 mW no-load power consumption at 230 V ac
  • Enables designs which easily meet global energy efficiency regulations
  • Achieves up to 90% full load efficiency
  • Output over-voltage protection
  • Open-gate detection for the synchronous rectification FET
  • Hysteretic thermal shut-down
  • Accurate internal constant-current limit


  • Power adapters and chargers
  • USB Type-C PD and programmable power supply (PPS) devices
  • Industrial power supplies
  • Metering
  • Displays
  • Appliances
  • Networking equipment
  • Games consoles
  • Automotive systems

Reference Design Kits

Reference design part number: RDK-838

RDK-838 is a reference design report for a 60 W USB PD 3.0 power supply with a 3.3 V-21 V output.

Reference design part number: RDK-710

RDK-710 is a reference design report for a 12 W dual-output open-frame power supply for appliances.

Reference design part number: RDK-919Q

RDK-919Q is a reference design report for a 60 W isolated automotive flyback power supply based on the InnoSwitch3-AQ.

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