Power Integrations LinkSwitch-TNZ Off-line Switcher ICs

Power Integrations LinkSwitch-TNZ Off-line Switcher ICs


Energy Efficient Off-line Switcher IC with Best-in-Class Light Load Efficiency and Lossless AC Zero-Cross Detection

Power Integrations LinkSwitch-TNZ Off-line Switcher ICs are designed to provide lossless zero-cross signal generation and support buck, buck-boost, and flyback topologies. These ICs offer more design flexibility than discrete implementations which reduces component count by 40% or higher. The LinkSwitch-TNZ ICs feature soft-start, auto restart, output Over Voltage Protection (OVP), line input Over Voltage Protection (OVL), and hysteretic Over-Temperature Protection (OTP). These ICs incorporate a 725V power MOSFET, an oscillator, a high-voltage switched current source, frequency jittering, hysteretic thermal shutdown, and input/output overvoltage protection circuitry. The LinkSwitch-TNZ ICs consume <100µA current in standby that results in power supply designs to meet no-load and standby regulations worldwide. These ICs are used in applications such as home and building automation, dimmers, switches and sensors with/without neutral wire, appliances, and IoT/industrial controls.


  • Lossless zero-cross signal generation
  • Supports buck, buck-boost, and flyback topologies
  • Enables ±3% regulation across line and load
  • 66kHz operation with accurate current limit
  • Frequency jittering reduces EMI filter complexity
  • Soft-start limits system component stress at start-up
  • Auto-restart for short-circuit and open-loop faults
  • Output Over Voltage Protection (OVP)
  • Line input Over Voltage Protection (OVL)
  • Hysteretic Over Temperature Protection (OTP)
  • On/off control provides constant efficiency over a wide load range

Block Diagram

Application Diagram


  • Aux power supply:
    • Power:
      • 575mA buck
      • 12W flyback
    • <20mW no-load power
    • <150 µA leakage minimizes flicker in lighting applications
  • 725V MOSFET rating for excellent surge withstand
  • <100µA IC standby supply current
  • <30mW no-load consumption with external bias

more information: https://www.power.com/products/linkswitch/linkswitch-tnz

About mixos

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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