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Design Review of a High Density USB-PD Power Supply using Active Clamp Flyback Topology

The classical flyback has reached its limitation in terms of efficiency and power density. The Active Clamp Flyback topology (ACF) utilizes the energy stored in the parasitics to achieve ZVS instead of dissipating it in the snubber circuit. The waveforms resulting are free of spikes which result in better EMI than the conventional techniques. So the ACF solves the efficiency puzzle while lowering EMI emissions.

You will learn about ACF operation, the problem of light load efficiency & standby power and how it can be solved by the NCP1568.

Furthermore, key component selection along with the equations for transformer design will be presented. Finally the performance data of a 65 W ultra-high density active clamp flyback board for an USB-PD application is reviewed.

Bryan McCoy
Applications Engineer, ON Semiconductor

Bryan McCoy is an applications engineer at ON Semiconductor developing ac to dc and dc to dc products in the consumer, industrial and telecommunications space. Prior to his employment at ON Semiconductor, he developed ac to dc and dc to dc charger products for Mobility Electronics. He has published numerous technical papers and has 6 patents issued. Bryan McCoy obtained his Bachelor of Science degree in Electrical Engineering from Arizona State University in 2004. He also hold an Associates degree in avionics technology. In addition, he served four years in the Air Force as an F-16 Specialist.


(Click on seminar technical session titles for more information)

8:30am – 9:00am - Registration & Coffee
10:00am – 11:00am - PFC: Bridgeless vs. Interleaved
11:00am – 11:10am - Break
11:10am – 12:10am - Control Loop Design
12:10am – 1:30pm - Lunch & Expo
2:00pm – 3:00pm - Design Review: Active Clamp Flyback Topology for High Density USB-PD Power Supply
3:00pm – 3:10pm - Break
3:55pm – 4:55pm - Design with SiC MOSFETs
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