Switcher IC offers lossless zero-cross detection and X-capacitor discharge

June 17, 2021 // By Jean-Pierre Joosting
Switcher IC offers lossless zero-cross detection and X-capacitor discharge
Compact offline LinkSwitch-TNZ switcher IC offers X-capacitor discharge functions for high power applications and reduces component count.

Power Integrations has announced LinkSwitch™-TNZ, a new 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 highly efficient LinkSwitch-TNZ switcher 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.

Adnaan Lokhandwala, product marketing manager at Power Integrations said: “The new LinkSwitch-TNZ ICs provide an accurate signal indicating that the sinusoidal AC line is at zero volts. This signal is used by smart home and building automation (HBA) products and appliances to control the switching of relays, IGBTs and TRIACs to minimize switching stress and system in-rush current. LinkSwitch-TNZ’s detection of the zero-cross point consumes less than 5 mW, allowing systems to reduce standby power losses versus alternative approaches that require ten or more discrete components and burn 50 to 100 mW of continuous power.”


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