Energy Efficient, Low Power Off-Line Switcher IC With Integrated System Level Protection

Figure 1. Typical Application with LinkSwitch-XT2.

Energy Efficient, Low Power Off-Line Switcher IC With Integrated System Level Protection

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Product Details

LinkSwitch™-XT2 incorporates a 725 V / 900 V power MOSFET, oscillator, simple ON/OFF control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the DRAIN pin, eliminating the need for a bias winding and associated circuitry.

Product Highlights

Easy to Design

  • Lowest component count switcher solution
  • Selectable device current limit
  • Fully integrated auto-restart for short-circuit and open-loop protection
  • Optional self-biased supply
  • Frequency jittering greatly reduces EMI
  • Meets HV creepage requirements between DRAIN and all other pins both on the PCB and at the package
  • Pin-out simplifies PCB heat sinking

Features Superior to Linear/RCC

  • Output overvoltage protection (OVP)
  • Input overvoltage line protection (OVL)
  • Hysteretic over-temperature protection (OTP)
  • Extended creepage between DRAIN pin and all other pins improves field reliability
  • 725 V MOSFET rating for excellent surge withstand
  • 900 V MOSFET rating series for industrial design or extra safety margin
  • Extremely low component count enhances reliability
    • Allows single-sided PCB and full SMD manufacturability

EcoSmart™– Extremely Energy Efficient

  • Easily meets all global energy efficiency regulations
  • No-load consumption <100 mW without bias winding at 265 VAC input (<10 mW with bias winding)
  • ON/OFF control provides constant efficiency to very light loads –ideal for mandatory CEC regulations


Power Table

Output Power Table4Peak or Open Frame1,2
230 VAC ±15%85-265 VAC
LNK3604P/G/D9.2 W6.1 W
230 VAC ±15%85-484 VAC
LNK3694P/G6 W4 W
LNK3696P/G11 W8 W


  1. Maximum continuous power in a typical non-ventilated enclosed adapter measured at 50 °C ambient.
  2. Maximum practical continuous power in an open frame design with adequate heat sinking, measured at 50 °C ambient.
  3. Packages: P: DIP-8C, G: SMD-8C, D: SO-8C. Please see Part Ordering Information.
  4. See Key Application Considerations section for complete description of assumptions.

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