Solution Finder Get Tech Support


CV/CC QR Flyback Switcher IC with Integrated 750 V, 900 V and 1700 V Switch and FluxLink Feedback for Automotive Applications


Product Details

The InnoSwitch3-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 1000 VDC.

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. Device start-up from 30 V makes it ideal for functional safety critical emergency power supplies.

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, 900 V or 1700 V switch and secondary-side sensing
  • Integrated FluxLink, HIPOT-isolated, feedback link
  • Wide input voltage 30 V to >1000 V

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 overvoltage and over-current
  • Accurate programmable output over-current threshold
  • Programmable input undervoltage

Full Safety and Regulatory Compliance

  • Fab, assembly and test site are IATF16949 certified
  • Reinforced isolation per IEC60664-1
  • Withstand isolation voltage >4000 VRMS
  • 100% production HIPOT testing
  • UL1577 isolation voltage 4000 VAC (max), TUV (EN62368-1), CQC (GB4943.1)
  • DIN VDE V 0884-11 approved for INN3977CQ
  • 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


  • Power supplies for automotive subsystems such as traction inverter emergency power supply (EPS), high-voltage to low-voltage DC to DC converters (APM), battery management system and on-board charger


Power - Output (Max, VDC) 50.00 W
Power - Output (Max Low-Line) 10.00 W
Power - Output (Max High-Line) 40.00W
Switching Frequency (min) 25.00 kHz
Switching Frequency (max) 95 kHz
Breakdown Voltage 1700 V
Voltage - Output (Min) 5.00 V
Voltage - Output (Max) 24.00 V
Voltage Input (Max, DC) 1200.00V
Voltage Input (Min, DC) 40.00V
Auto-Restart & Overvoltage Response
Latch Off
IC Package InSOP-24D
Internal Switch Yes
Over-Temperature Response Hysteretic
Temperature - Operating (Min) -40 °C
Temperature - Operating (Max) 150 °C
Control Scheme Fluxlink
Protection Features
Input Undervoltage
Open SR FET Detection
Output Overload
Output Overvoltage
Output Short Circuit
Output Profile CV
Topology Flyback
Product Sub-Type PMIC
MSL Rating 3
Secondary Response
Latch Off