The LinkSwitch-TNZ family of ICs combine power conversion with lossless generation of AC zero crossing signal used typically for system clock and timing functions. Designs using the highly integrated LinkSwitch-TNZ ICs are more flexible than discrete implementations reducing component count by 40% or higher. Besides enabling 80%+ efficiencies in low power Flyback designs, very low consumption at light loads enabled by On/Off control allow for more functions (display, wireless connectivity, sensors etc.) to be active during system standby. The device family supports buck, buck-boost and flyback converter topologies.
Features
- Lossless zero cross signal generation
- Supports buck, buck-boost and flyback topologies
- Enables ±3% regulation across line and load
- Selectable device current limit
- 66 kHz operation with accurate current limit
- Allows the use of low-cost off-the-shelf inductors
- Reduces size and cost of magnetics and output capacitor
- Frequency jittering reduces EMI filter complexity
- X capacitor discharge function (LNK331x only)
- IC standby supply current <100 µA
- On/Off control provides constant efficiency over a wide load range
- Easily meets all global energy efficiency regulations
- No-load consumption <30 mW with external bias
- Enhanced Safety and Reliability Features
Applications
- Smart home and building automation
- IoT, HBA and industrial controls
- Dimmers, switches and sensors with and without neutral wire
- White goods
Key Components
- 725 V power MOSFET
- Oscillator
- High-voltage switched current source for self-biasing
- Frequency jittering
- Fast (cycle-by-cycle) current limit
- Hysteretic thermal shutdown
- Output and input overvoltage protection circuitry
Benefits
- Highest performance and design flexibility
- Enhanced safety and reliability
- Extremely energy efficient
- PCB space reduction and low BOM count
- Flexible converter topologies
- Meet regulatory requirements that limit power consumption
Diagram
Schematic - LinkSwitch-TNZ