Enhanced Safety and Reliability Features

• Soft-start limits system component stress at start-up

• Auto-restart for short-circuit and open loop faults

• Output overvoltage protection (OVP)

• Line input overvoltage 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

• Nemko (EN62368-1) and CB (IEC62368-1) certifications

EcoSmart™– Extremely Energy Efficient

• IC standby supply current <100 mA

• 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

Applications

• Home and building automation

• Dimmers, switches and sensors with and w/o Neutral wire

• Appliances

• IoT and industrial controls

Description

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.

Each device incorporates a 725 V power MOSFET, oscillator, a

high-voltage switched current source for self-biasing, frequency jittering,

fast (cycle-by-cycle) current limit, hysteretic thermal shutdown, and

output and input overvoltage protection circuitry onto a monolithic IC.

LinkSwitch-TNZ ICs consume <100 mA current in standby resulting in

power supply designs that can meet no-load and standby regulations

worldwide. MOSFET current limit modes can be selected through the

BYPASS pin capacitor value. The high current limit level provides

maximum continuous output current while the low level permits using

very low-cost and small surface mount inductors. A full suite of

protection features enables safe and reliable power supplies protecting

the device and the system against input and output overvoltage faults,

device over-temperature faults, lost regulation, and power supply

output overload or short-circuit faults.