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Switching ICs rev up power supply circuits

21 Sep 2015

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Power Integrations has launched the InnoSwitch-EP, a new family of offline CV/CC flyback switching ICs. With an integrated 725V MOSFET, precise feedback sensing control and synchronous rectification, the IC family delivers less than 10mW transient response and multi-output cross-regulation with full line protection.

InnoSwitch-EP ICs use the FluxLink technology to produce power supply circuits without an opto-coupler for applications including auxiliary and standby power in appliances, HVAC, consumer electronics, computing, telecom and data communication.

The use of FluxLink technology enables high-performance secondary-side control to be delivered with the simplicity and low component count usually associated with primary-side regulation. This allows synchronous rectification technology to be employed, resulting in efficient performance across full load range, including heavy loads.

For example, InnoSwitch-EP ICs enable 20W power supplies to achieve 90 per cent efficiency in a multi-output design, while minimising no load consumption to less than 30mW. Line over-voltage regulation is highly accurate at ±5 per cent, while ±5 per cent OCP regulation is also achieved.

InnoSwitch-EP ICs enable a low BOM count and the elimination of optocouplers, which degrade with time. Low voltage-drop across the synchronous rectifier FETs ensures highly accurate cross regulation between output voltage rails, potentially eliminating second stage linear regulators, saving cost and wasted energy. This makes them suitable for applications in home appliances such as microwaves, washers and dryers, as well as stand-by power supplies for PC/server, air conditioning systems, displays, TVs and smart lighting ballasts.

InnoSwitch-EP ICs also enable designers to meet new ENERGY STAR 7 efficiency standards for monitors.

InnoSwitch-EP samples are available now. Devices are priced at $1.08 in 10,000-piece quantities. Reference design, RDK-469, is available from the Power Integrations website at

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