InnoSwitch ICs predicted to Revolutionize Adapter and Charger Designs

November 17, 2014 By admin Comments are Off

Power Integrations, Inc. announced during Electronica 2014 a new class of power-supply ICs. The InnoSwitch™ family of highly integrated switcher ICs combines primary, secondary and feedback circuits into a single, worldwide safety-rated, surface-mount package. With InnoSwitch ICs, designers can easily exceed all global regulatory standards for efficiency and no-load consumption, while minimizing component count and providing highly accurate constant voltage and constant current up to 25 W. The InnoSwitch family is designed for smart mobile device chargers and adapters for a wide range of applications such as set-top boxes, networking equipment and computer peripherals.

“This revolutionary new product was an immediate success with our beta customers,” commented Peter Rogerson, Director of Global Marketing Communications with Power Integrations. “As a result of strong demand from those beta customers, we entered volume production even before announcing InnoSwitch ICs to the general market. And there are already commercial products using InnoSwitch ICs in production,” Rogerson continued.

Inside the new device, highly accurate secondary-side direct voltage and current measurements are communicated across the safety isolation barrier using high-speed digital FluxLink™ technology. This proprietary new feedback technique permits precise control without the need for a bulky optocoupler, while avoiding the performance compromises inherent in primary-side regulation (PSR), such as limited accuracy and efficiency and poor transient response versus no-load consumption. Furthermore, unlike primary-side regulated switchers, InnoSwitch-based secondary-side regulated (SSR) designs are inherently less sensitive to the tolerance of external components such as transformers, diodes, resistors and capacitors.

This dramatically increases manufacturing yield and reduces total power supply cost. Now, mobile device chargers up to 5 A can have a total component count as low as PSR designs, with accurate CV and CC control (+/- 3% and +/- 5% respectively) and low voltage ripple. With high operating efficiency and <10 mW no-load consumption, the ICs easily comply with efficiency standards such as the California Energy Commission, European Union Code of Conduct (CoC) Version 5, Tier 2, and the upcoming US Department of Energy standards (DoE 6), which will become mandatory in February, 2016.

InnoSwitch power-supply ICs include a high-voltage power MOSFET, primary-side controller, FluxLink feedback technology and a secondary-side controller with synchronous rectification (SR). By combining the SR function with the secondary-side master controller and by leveraging the speed of the FluxLink communication channel, the SR switch timing is optimized for maximum efficiency. The fast communication link also ensures highly reliable SR operation, eliminating shoot-through in either discontinuous conduction mode (DCM) or continuous conduction mode (CCM), even during transient loads and fault conditions. Effective SR operation in both DCM and CCM modes is especially beneficial in adaptive-voltage charger applications.

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InnoSwitch ICs start up using bias current drawn from a high-voltage current source connected to the DRAIN pin, eliminating the need for external start-up components. An external bias winding reduces no-load and increases system efficiency during normal operation. The ICs also include comprehensive system-level features such as output over-voltage protection, overload power limiting, hysteretic thermal protection and frequency jitter to reduce EMI.

Comments Mike Matthews, Power Integrations’ vice president of product development: “InnoSwitch ICs are the first switchers to combine the simplicity and low component count of primary-side regulation with the high performance of secondary-side control. The InnoSwitch family’s high level of integration reduces power supply component count and its secondary-side regulated topology allows the use of simpler, lower cost, auto-wound transformers, yet improves production yield, resulting in significantly lower manufacturing cost. Two of the world’s leading mobile device makers are in production with chargers using InnoSwitch family ICs which incorporate FluxLink technology.”

InnoSwitch-CH, optimized for chargers, are the first released devices in the family and samples are available now. InnoSwitch-CH ICs are priced at $0.59 to $0.78 in 10,000-piece quantities. Reference design RDR-420 describes a 5 V, 2 A USB charger design and is available for download now on the Power Integrations website

source: http://www.powerpulse.net/story.php?storyID=31107

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