Off-Line CV/CC Flyback Switcher IC with Integrated MOSFET, Sync-Rect and Feedback

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Figure 1. Typical Application/Performance.

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Product Details

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

The InnoSwitch™-EP family of ICs dramatically simplify the development and manufacturing of low-voltage, high current power supplies, particularly those in compact enclosures or with high efficiency requirements. The InnoSwitch-EP architecture is revolutionary in that the devices incorporate both primary and secondary controllers, with sense elements and a safety-rated feedback mechanism into a single IC.

Close component proximity and innovative use of the integrated communication link permit accurate control of a secondary-side synchronous rectification MOSFET and optimization of primary-side switching to maintain high efficiency across the entire load range. Additionally, the minimal DC bias requirements of the link, enable the system to achieve less than 10 mW no-load to maximize efficiency in standby.

Product Highlights

Highly Integrated, Compact Footprint

  • Incorporates flyback controller, 725 V / 900 V MOSFET, secondary-side sensing and synchronous rectification driver
  • FluxLink™ integrated, HIPOT-isolated, feedback link
  • Exceptional CV accuracy, independent of transformer design or external components
  • Excellent multi-output cross regulation with weighted SSR feedback and synch FETs

EcoSmart™– Energy Efficient

  • <10 mW no-load at 230 VAC when supplied by transformer bias winding
  • Easily meets all global energy efficiency regulations

Advanced Protection / Safety Features

  • Primary sensed output OVP
  • Secondary sensed output overshoot clamp
  • Secondary sensed output OCP to zero output voltage
  • Hysteretic thermal shutdown
  • Input voltage monitor with accurate brown-in/brown-out and overvoltage protection

Full Safety and Regulatory Compliance

  • 100% production HIPOT compliance testing equivalent to 6 kV DC/1 sec
  • Reinforced insulation
  • Isolation voltage >3,500 VAC for INN26xx series, >4,000 VAC for INN2904
  • UL1577 and TUV (EN60950, EN62368) safety approved
  • EN61000-4-8 (100 A/m) and EN61000-4-9 (1000 A/m) compliant

Green Package

  • Halogen free and RoHS compliant


  • Appliance, industrial, and smart lighting

Learn more about InnoSwitch for high voltage applications.


(An audio-only version of this presentation is also available for download here.)


Power Table

Output Power Table
PRODUCT3 Peak or Open Frame1,2
230 VAC ±15% 85-265 VAC
INN2603K 24 W 15 W
INN2604K 27 W 20 W
INN2605K 35 W 25 W
230 VAC ±15% 85-484 VAC
INN2904K 29 W 20 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: K: eSOP-R16B.

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