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Power Integrations unveils LinkSwitch-TNZ, a new switching power supply IC

New from Power Integrations, the LinkSwitch-TNZ is a switching power supply IC that combines offline power conversion, lossless zero-cross detection and, optionally, X-capacitor discharge functions in a compact SO-8C package.

The LinkSwitch-TNZ IC can be used for non-isolated buck and buck-boost power supplies up to 575 mA output current and provides up to 12 W output for universal-input isolated flyback designs

Devices such as light switches, dimmers, sensors, and plugs connect and disconnect the AC line periodically using a relay or TRIAC. Usually, a discrete circuit is implemented to detect the AC line zero-crossing to control the turn-on transition of the main power device while reducing switching losses and in-rush current. This approach requires many components and is very lossy, consuming almost half of the standby power budget in some cases. Similarly, appliances often use a discrete zero-cross detection circuit to control motor and MCU timing. These applications also require an auxiliary power supply for functions such as wireless connectivity, gate drivers, sensors and displays.

The LinkSwitch-TNZ IC is able to provide best-in-class light-load efficiencies, enabling more system features to be powered while meeting stringent standby regulations such as: the European Commission (EC) standard for home appliances (1275), which requires equipment to consume no more than 0.5 W in standby or in off mode; ENERGY STAR’s version 1.1 for Smart Home Energy Management Systems (SHEMS), which limits standby consumption of smart lighting control devices to 0.5 W; and China’s GB24849, which limits the off-mode power consumption in microwave ovens to 0.5 W.

LinkSwitch-TNZ ICs also reduce component count by 40% or more when compared to discrete designs.

Optionally, an X-capacitor discharge function can also be included in the package for high power applications, leading to greater PCB space reduction, low BOM count and increased reliability (LNK331x).

LinkSwitch-TNZ switching power supply ICs enable ±3% regulation across line and load, no-load consumption of less than 30 mW with external bias and have an IC standby current of less than 100 µA.

Parts are simple to design in, feature an integrated soft start, and work with both isolated and non-isolated topologies.

Author
Neil Tyler

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