Offline switcher chips meet 2016 codes for portable device chargers

July 31, 2014 // By Graham Prophet
Power Integrations’ LinkSwitch-3 ICs meet 2016 European Code of Conduct guidelines, and 2016 DoE 6 EPS efficiency regulations for smartphone and tablet chargers. The highly integrated devices enable charger designs up to 10W with only 28 components.

LinkSwitch-3 integrated monolithic switching ICs deliver accurate primary-side regulation for chargers and adapters up to 10W, making them suitable for smartphones, tablets and other mobile devices, particularly those subject to 30 mW no-load limitations, such as upcoming mandatory US DoE EPS efficiency regulations and EU CoC Tier 2 guidelines.

LinkSwitch-3 ICs simplify CV/CC charger designs by eliminating the need for opto-couplers and secondary-side control circuitry; a 10W charger, for example, can be implemented using 28 external components. They provide highly accurate output voltage and current regulation, compensating for transformer and internal parameter tolerances along with voltage variation from the AC line. LinkSwitch-3 ICs incorporate a 725-V power MOSFET, on/off-control state machine, high-voltage switched current source for self-biasing, frequency jittering to minimise EMI, plus cycle-by-cycle current limit and hysteretic thermal shutdown circuitry. The ICs also feature selectable cable-drop compensation for improved voltage tolerance over load. PI adds that the devices meet market demand for 30 mW no-load performance with fast transient response. The are in SO-8, eSIP-7 and eSOP-12 packages.

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