ON Semiconductor Introduces Industry’s First Integrated Single-Stage Active Power Factor Correction and Isolated Step-Down Controller

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NCP1651 reduces board space and overall system costs in battery-charger and high- power adapter applications

PHOENIX, Ariz. – Oct. 28, 2003 - Continuing to respond to the industry need for comprehensive power-management solutions in the smallest space at lowest cost, ON Semiconductor (Nasdaq: ONNN) today introduced the NCP1651 – an integrated controller that facilitates the simplest possible implementation of power-factor corrected, isolated power converters and reduces both part count and overall design costs for power conversion applications such as battery chargers and distributed power systems up to 200 watts (W).

Features and Benefits
The NCP1651 provides a low-cost, low component-count solution that is compliant with IEC1000-3-2 harmonic standards for isolated ac-dc converters with mid-high output voltage requirements. Fixed-frequency continuous conduction mode (CCM) operation simplifies the design of the input Electromagnetic Interference (EMI) filter and optimizes efficiency. The controller also can operate in discontinuous conduction mode for maximum design flexibility.

Compared to a conventional power conversion design that uses a PFC controller followed by a dc-dc converter, the unique single-stage design of the NCP1651 eliminates one entire power switching section including the boost inductor, the power MOSFET, the high voltage capacitor and ancillary components. Unlike other “single stage” solutions, the NCP1651 approach reduces the power stage requirements to a minimum: a single magnetic element, a switch, a diode and a capacitor. An internal high-voltage start-up circuit reduces component count further by eliminating external start-up circuitry. Other features of the NCP1651 include a high accuracy multiplier that reduces over-design of the power components, an over-temperature shutdown and an under-voltage lockout.

ON Semiconductor offers a design tool for the NCP1651 that reduces the time needed to produce a first-pass working circuit from days to hours. Starting with a few key metrics provided by the design engineer, the tool uses a sophisticated design methodology to select the correct component values and produce a complete bill of materials. The tool also displays graphs of key performance parameters to aid in system fine-tuning. The NCP1651 design aid is downloadable from the ON Semiconductor website.

“The NCP1651 is ideally suited for notebook adapters, distributed power systems and any similar application where the designer is concerned about minimizing cost, component count, and size, yet still requires high-input power factor and low THD (total harmonic distortion),” said Andy Williams, ON Semiconductor director of Power Conversion Products.

Package and Price
The NCP1651 is offered in a compact SO-16 package and is priced at $1.50 per unit in 10,000 unit quantities.

For additional information or to request samples, visit https://www.onsemi.com/tech .

About ON Semiconductor
ON Semiconductor (Nasdaq: ONNN) offers an extensive portfolio of power- and data-management semiconductors and standard semiconductor components that address the design needs of today’s sophisticated electronic products, appliances and automobiles. For more information visit ON Semiconductor’s website at https://www.onsemi.com .

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ON Semiconductor and the ON Semiconductor logo are registered trademarks of Semiconductor Components Industries, LLC. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Although the company references its website in this news release, such information on the website is not to be incorporated herein.

About onsemi

onsemi (Nasdaq: ON) is driving disruptive innovations to help build a better future. With a focus on automotive and industrial end-markets, the company is accelerating change in megatrends such as vehicle electrification and safety, sustainable energy grids, industrial automation, and 5G and cloud infrastructure. With a highly differentiated and innovative product portfolio, onsemi creates intelligent power and sensing technologies that solve the world’s most complex challenges and leads the way in creating a safer, cleaner, and smarter world.

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onsemi and the onsemi logo are trademarks of Semiconductor Components Industries, LLC. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Although the Company references its website in this news release, information on the website is not to be incorporated herein.

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