New Products

InnoSwitch3-EP Family of ICs

August 30, 2020 by Power Integrations

The InnoSwitch3-EP is an off-line CV/CC QR flyback switcher IC with integrated primary-side switch, synchronous rectification, and FluxLink feedback.

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.


typical application schematic

Figure 1. Typical application schematic


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

  • PI’s proprietary gallium nitride technology 
  • Up to 100 W output without heatsinks
  • INN3678, INN3679 and INN3670


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



  • Large and small appliances
  • High and unstable mains voltage
  • Industrial
  • Motor/Drive control
  • Ultra-low standby/No-load power solutions
  • Utility/Smart meter