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High Efficiency Off-line CV/CC QR Flyback Switcher IC with Integrated 725 V Primary MOSFET, Synchronous Rectification and Integrated Secondary-Side Control


Product Details

The InnoSwitch3-TN family dramatically increases the efficiency of auxiliary power supplies used in appliances, consumer products and industrial applications. Ideal for both isolated and non-isolated designs, this advanced flyback controller can achieve up to 90% full load efficiency, flat efficiency across the load range and very low no-load consumption. The InnoSwitch3-TN may be used as an accurate 5 V single-output power supply, with two positive rails or with both positive and negative rails.

The 725 V primary MOSFET, primary and secondary flyback controllers are coupled using the proprietary FluxLink communications channel. Safety-rated FluxLink communication ensures reliable synchronous rectification and accurate output CV and CC. Comprehensive safety features include output over-current protection and over-temperature protection. The small MinSOP package and a low number of external components make the InnoSwitch3-TN ICs ideal for compact designs.

Product Highlights

Ideal for Isolated and Non-Isolated Applications

  • Flybacks with positive and negative output rails
  • Incorporates a multi-mode Quasi Resonant (QR) / CCM flyback controller, 725 V primary MOSFET, secondary voltage and current sensing, SR driver
  • Integrated FluxLink™ feedback
  • Compact package reduces PCB area
  • High efficiency across load range
  • Accurate CV/CC independent of transformer design or external components
  • Easily meets 20% regulation limit on 5 V output during zero load to full-load transients

EcoSmart™ – Energy Efficient

  • Less than 5 mW no-load at 230 VAC
  • Enables designs that easily meet global energy efficiency regulations
  • Achieves up to 90% full load efficiency

Advanced Protection / Safety Features

  • Integrated output OVP
  • Open-gate detection for SR FET
  • Hysteretic thermal shutdown
  • Overload power limited <15 W (5 V and <3 A)
  • Using accurate internal CC (constant-current) limit

Full Safety and Regulatory Compliance

  • Reinforced insulation with isolation voltage >4000 VAC
  • 100% production Hipot testing
  • UL1577, TUV (EN62368-1), CQC (GB4943.1) safety approved. VDE 0884-17 (EN60747-17) pending approval
  • Enables designs that have “class A” performance criteria for EN61000-4 suite of test standards, including 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)

Green Package

  • Halogen free and RoHS compliant


Output Power (Max) - Open Frame, 230V 15.00 W
Output Power (Max) - Open Frame, Univ 12.00 W
Switching Frequency (min) 25.00 kHz
Switching Frequency (max) 95 kHz
Breakdown Voltage 725 V
Voltage - Input (Min) 85 V
Voltage - Input (Max) 265 V
Auto-Restart & Overvoltage Response
Latch Off
IC Package MinSOP-16A
Internal Switch Yes
Over-Temperature Response Hysteretic
Temperature - Operating (Min) -40 °C
Temperature - Operating (Max) 150 °C
Control Scheme Fluxlink
Protection Features
Input Overvoltage
Input Undervoltage
Open SR FET Detection
Output Overload
Output Overvoltage
Output Short Circuit
Output Profile CV/CC
Topology Flyback
Product Sub-Type PMIC
MSL Rating 3
Secondary Response
Latch Off