Off-Line Flyback CV/CC Switcher IC with Integrated MOSFET, Synchronous Rectification and Feedback

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New from EDN: PI's VP of Marketing, Doug Bailey, discusses development of InnoSwitch technology. Read the article and watch the video now!

The InnoSwitch™-CH Family of ICs combines primary, secondary  and feedback circuits in a single surface mounted off-line flyback switcher IC. The InnoSwitch-CH IC incorporates the primary FET, the primary side controller and a secondary-side synchronous rectification controller. The new IC also includes an innovative new technology, FluxLink™, which safely bridges the isolation barrier and eliminates the need for an optocoupler.  The incorporation of the secondary side controller enables a shoot-through proof synchronous rectification FET drive while delivering fast transient response, exceeding all world-wide efficiency standards, including the Code of Conduct Version 5 and DoE Version 6 regulations. 

Product Highlights

Highly Integrated, Compact Footprint

  • Incorporates flyback controller, 650 V MOSFET, 
    secondary-side sensing and synchronous rectification
  • Integrated, HIPOT-isolated, feedback link
  • Exceptional CV/CC accuracy, independent of transformer design or external components
  • Instantaneous transient response ±5% CV with 
    0-100-0% load step

EcoSmart™– Energy Efficient

  • <10 mW No-load @ 230 VAC with optional bias winding
  • Easily meets all global energy efficiency regulations, including DOE 6/CoC v5
  • Low heat dissipation

Advanced Protection / Safety Features

  • Primary sensed output OVP with optional bias winding
  • Secondary sensed output overshoot clamp
  • Secondary sensed output OCP to zero output voltage
  • Hysteretic thermal shutdown
  • 725 V power MOSFET

Full Safety and Regulatory Compliance

  • 100% production HIPOT compliance testing 
    at 6 kV DC/1 sec
  • Reinforced insulation
  • Isolation voltage = 3,500 VAC UL1577 and TUV (EN60950) safety approved EN61000-4-8 (100 A/m) and EN61000-4-9 (1000 A/m) compliant

Green Package

  • Halogen free and RoHS compliant


  • Chargers and adapters for smart mobile devices
  • LED lighting
  • High efficiency, low voltage, high current power supplies


Power Table

Output Power (Watts)
230 VAC ±15%85-265 VAC
Adapt.1Peak or
Adapt.1Peak or
INN20x3K12 W15 W12 W15 W
INN20x4K15 W20 W15 W20 W
INN20x5K20 W25 W20 W25 W


  1. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +40 °C ambient temperature.
  2. Minimum peak power capability.
  3. Package: K: eSOP-R16B.
  4. x = 0 (No cable compensation), x = 2 (6% cable compensation).

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