Off-Line CV/CC QR Flyback Switcher IC with Integrated Primary-Side Switch, Synchronous Rectification and FluxLink Feedback

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Product Details

The InnoSwitch™3-EP family of ICs dramatically simplifies the design and manufacture of flyback power converters, particularly those requiring high efficiency and/or compact size. The InnoSwitch3-EP family incorporate a high-voltage power switch, primary and secondary controllers, and safety-rated feedback into a single IC. These devices incorporate multiple protection features including line over and under-voltage protection, output over-voltage and over-current limiting, and over-temperature shutdown. Devices are available with standard and peak power delivery options, and commonly used auto-restart protection behaviors.

Product Highlights

Highly Integrated, Compact Footprint

  • Very high efficiency across full load range
  • Incorporates a multi-mode Quasi-Resonant (QR) / CCM flyback controller, high-voltage switch, secondary-side sensing and synchronous rectification driver
  • Excellent multi-output cross regulation with weighted secondary-side
    regulation (SSR) feedback and synch FETs
  • Integrated FluxLink™, HIPOT-isolated, feedback link
  • Exceptional CV/CC accuracy, independent of external components
  • Adjustable accurate output current sense using external output sense resistor

PowiGaN Technology

EcoSmart™ – Energy Efficient

  • Less than 30 mW no-load including line sense
  • Easily meets all global energy efficiency regulations
  • Low heat dissipation

Advanced Protection / Safety Features

  • Open SR FET-gate detection
  • Fast input line UV/OV protection
  • Auto-restart fault response for output OVP
  • 725/750 V Switch rating series for excellent surge protection
  • 900 V Switch rating series for industrial design or extra safety

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, EN62368) 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) and Ford FMC1278 (RI-115)

Green Package

  • Halogen free and RoHS compliant


Power Table

Output Power Table
PRODUCT3725 V Switch
230 VAC ±15%85-265 VAC
Peak or Open Frame1,2Peak or Open Frame1,2
INN3672C-H60X12 W10 W
INN3673C-H60X15 W12 W
INN3674C-H60X25 W20 W
INN3675C-H60X30 W25 W
INN3676C-H60X40 W36 W
INN3677C-H60X45 W40 W
PRODUCT3750 V Switch
230 VAC ±15%85-265 VAC
Peak or Open Frame1,2Peak or Open Frame1,2
INN3678C-H60X475 W65 W
INN3679C-H60X485 W75 W
INN3670C-H60X4100 W85 W
PRODUCT3900 V Switch
230 VAC ±15%85-265 VAC
Peak or Open Frame1,2Peak or Open Frame1,2
INN3692C-H60X12 W10 W
INN3694C-H60X25 W20 W
INN3696C-H60X35 W30 W


  1. Minimum continuous power in a typical non-ventilated enclosed typical size adapter measured at 40 °C ambient. Max output power is dependent on the design. With condition that package temperature must be < 125 °C
  2. Minimum peak power capability
  3. Package: inSOP-24D
  4. Incorporates PowiGaN™ technology.

InnoSwitch3-EP Feature Codes

InnoSwitch3-EP ICs are highly configurable, and require a "Feature Code" to specify all of the configurable characteristics, such as the Auto Restart Threshold, Fault Response, and others. Feature Codes consist of the letter "H" followed by three numbers and are added to the end of the base part number. A Feature Code is required when ordering parts (e.g., INN3762C-H601).

The tables below provide a list of the characteristics of the Feature Codes, and the  parts available with that Feature Code. Please use these to determine which InnoSwitch3-EP part is the best fit for your application. Alternatively, you can use our Build Your Own InnoSwitch tool.

CDCAR ThresholdOTP ResponseAR and OVL ResponseOutput ProfileVout OVPSecondary
H6010 mV90%HystereticARFixed CC120%AR
H6020 mVOLHystereticARCV Only120%AR
H6050 mV90%HystereticARFixed CC120%AR
H6060 mVOLHystereticARCV Only120%AR
 Common Feature Code
INN3672C-H60Xpdf iconpdf iconpdf icon
INN3673C-H60Xpdf iconpdf iconpdf icon
INN3674C-H60Xpdf iconpdf iconpdf iconpdf icon
INN3675C-H60Xpdf iconpdf iconpdf iconpdf icon
INN3676C-H60Xpdf iconpdf iconpdf iconpdf icon
INN3677C-H60Xpdf iconpdf iconpdf iconpdf icon
INN3678C-H60Xpdf iconpdf icon
INN3679C-H60X  pdf iconpdf icon
INN3670C-H60X  pdf iconpdf icon
INN3692C-H60Xpdf icon
INN3694C-H60Xpdf icon
INN3696C-H60X pdf icon

= indicates part available with that Feature Code

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