New Products

InnoSwitch3-AQ Family of ICs

August 30, 2020 by Power Integrations

The InnoSwitch3-AQ is a CV/CC QR flyback switcher IC with integrated 750 V MOSFET and FluxLink feedback for automotive applications.

The InnoSwitch™3-AQ family of ICs dramatically simplifies the design and manufacture of flyback power converters, particularly those requiring high efficiency and/or compact size. The InnoSwitch3-AQ family combines primary and secondary controllers and safety-rated feedback into a single IC allowing accurate output voltage regulation even with wide input voltage range of 30 VDC to 550 VDC.


Figure 1. Typical application schematic


InnoSwitch3-AQ family devices incorporate multiple protection features including line over and undervoltage protection, output overvoltage and over-current limiting, and over-temperature shutdown for automotive applications. Devices are available with standard and peak power delivery options, and commonly used auto-restart protection behaviors.


Product Highlights

Highly Integrated, Compact Footprint

  • AEC-Q100 qualified
  • Up to 90% efficiency across full load range
  • Incorporates a multi-mode Quasi-Resonant (QR) / CCM flyback controller, 750 V MOSFET and secondary-side sensing
  • Integrated FluxLink™, HIPOT-isolated, feedback link
  • Wide input voltage 30 VDC to 550 VDC
  • Wide input voltage 30 VDC to 921 VDC with StackFET
  • Fab, assembly and test site are IATF16949 certified


EcoSmart™ – Energy Efficient

  • Less than 15 mW no-load including line sense
  • Easily meets all global energy efficiency regulations
  • Low heat dissipation
  • Advanced Protection / Safety Features
  • Auto-restart fault response for output OVP


Optional Features

  • Auto-restart output UV protection with option for peak power delivery


Full Safety and Regulatory Compliance

  • Reinforced isolation
  • Isolation voltage >4000 VAC
  • 100% production HIPOT testing
  • UL1577 and TUV (EN60950) safety approved
  • Excellent noise immunity enables designs that achieve class “A” performance criteria for EN61000-4 suite; EN61000-4-2, 4-3 (30 V/m), 4-4, 4-5, 4-6, 4-8 (100 A/m) and 4-9 (1000 A/m), FMC1278 (RI-115)


Green Package

  • Halogen free and RoHS compliant



  • Auxiliary, standby and bias power supplies for automotive used in traction inverter, DC-DC converter and on-board charger