The new LinkSwitch-3 family of highly integrated monolithic switching ICs from Power Integrations delivers accurate primary-side regulation for chargers and adaptors up to 10 W, 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.
The chips simplify constant-voltage (CV)/constant-current (CC) charger designs by eliminating the need for optocouplers and secondary-side control circuitry; a 10 W charger, for example, can be implemented using only 28 external components. They provide highly accurate output voltage and current regulation, compensating for transformer and internal parameter tolerances along voltage variation from the AC line.
Available in SO-8, eSIP-7 and eSOP-12 packages, 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. Selectable cable drop compensation is also included for improved voltage tolerance over load.
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