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

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Product Details

The InnoSwitch™3-CP family of ICs dramatically simplifies the design and manufacture of flyback power converters, particularly those requiring high efficiency and/or compact size. The InnoSwitch3-CP family incorporates a high-voltage primary-side 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 that support the common combinations of latching and auto-restart behaviors required by applications such as quick charge and USB PD designs. The devices are available with and without cable-drop compensation.

Product Highlights

Highly Integrated, Compact Footprint

  • Quasi-Resonant (QR) / CCM flyback controller, high-voltage primary-side switch, secondary-side sensing and synchronous rectification driver
  • Integrated FluxLink™, HIPOT-isolated, feedback link
  • Easily interfaces to load-directed and fast-charge protocol ICs
  • Constant Power (CP) Profile minimizes charging time with continuous adjustment of output current and voltage
  • Accurate CV/CC/CP, independent of external components
  • External IS resistor allows custom CC programming
  • Instantaneous transient response with 0%-100%-0% load step

PowiGaN Technology

EcoSmart™– Energy Efficient

  • Up to 95% efficiency across full load range
  • Less than 30 mW no-load including line sense
  • Easily meets all global energy efficiency regulations
  • Low heat dissipation

Advanced Protection / Safety Features

  • Secondary Switch or diode short-circuit protection
  • Open SR FET-gate detection
  • Fast input line UV/OV protection

Optional Features

  • Cable-drop compensation with multiple settings
  • Variable output voltage, constant current profiles
  • Auto-restart or latching fault response for output OVP/UVP
  • Multiple output UV fault thresholds
  • Latching or hysteretic primary over-temperature protection

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 for EN61000-4; 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)


Power Table

Output Power (Watts)
230 VAC ± 15%85-265 VAC
INN3264C/3274C-H2XX20 W25 W15 W20 W
INN3265C/3275C-H2XX25 W30 W22 W25 W
INN3266C/3276C-H2XX35 W40 W27 W36 W
INN3277C-H2XX40 W45 W36 W40 W
INN3267C-H2XX45 W50 W40 W45 W
INN3268C-H2XX55 W65 W50 W55 W
INN3278C-HXXX570 W75 W55 W65 W
INN3279C-HXXX580 W85 W65 W75 W
INN3270C-HXXX590 W100 W75 W85 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. 650 V Switch (INN326x); 725 V Switch (INN3274-7); 750 V Switch (INN3278, INN3279, INN3270).
  5. Incorporates PowiGaN™ technology.

InnoSwitch-3 Feature Codes

InnoSwitch-3 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., INN3265C-H202).

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 InnoSwitch-3 part is the best fit for your application. Alternatively, you can use our Build Your Own InnoSwitch tool.

CDCAR ThresholdOTP ResponseAR
OVL Response
Output ProfileVout OVPSecondary
H1140 mV63%ARARFixed CCEnabledAR
H2010 mV3.45 VHystereticARCP-6V AR
H202300 mV3.45 VHystereticARCP-6V AR
H2030 mV3.45 VHystereticARCP-9V AR
H204300 mV3.45 VHystereticARCP-9V AR
H2050 mV3.45 VHystereticARCP-12VAR
H2060 mV63%Latch OffLatch OffFixed CC Latch Off
H2070 mV3.45 VLatch OffLatch OffCP-15V Latch Off
H2080 mV3.45 VLatch OffARCP-15V Latch Off
H2090 mV3.45 VLatch OffARFixed CC Latch Off
H2100 mV55%ARARCP-9V AR
H2110 mV55%ARARCP-6V AR
H2120 mV55%ARARFixed CC Latch Off
H2150 mV3.45 VLatch OffARFixed CC Latch Off
H2170 mV63%Latch OffLatch OffFixed CC Latch Off
H218*0 mV3.45 VLatch OffARFixed CC Latch Off

*INN3279C-H218 has specific ILIM = 2.30 A; ILIM+1 = 2.58 A.

In the following tables, click the PDF icon to view the data sheet addendum for each part.

 Feature Code
650 VINN3264C-HXXX pdf iconpdf icon             
INN3265C-HXXX pdf iconpdf icon        pdf icon    
INN3266C-HXXX   pdf iconpdf icon pdf icon   pdf icon     
INN3267C-HXXX     pdf icon          
INN3268C-HXXX  pdf icon   pdf iconpdf iconpdf iconpdf icon  pdf icon  
725 VINN3274C-HXXX pdf iconpdf icon             
INN3275C-HXXX pdf iconpdf icon             
INN3276C-HXXX   pdf iconpdf icon pdf icon         
INN3277C-HXXX     pdf icon          
750 VINN3278C-HXXXpdf icon          pdf iconpdf icon
INN3279C-HXXXpdf iconpdf iconpdf iconpdf icon
INN3270C-HXXXpdf icon          pdf iconpdf icon

pdf icon = indicates part available with that Feature Code

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