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.

Features

• 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

Specifications

• 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

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