Feature: Power


power stages, such as those in USB Type-C chargers. Flyback converters based on the InnoSwitch3 with PowiGaN technology offer efficiency of around 95% when operating at power levels up to 100W. High efficiency is not the only reason


to choose the InnoSwitch3 with PowiGaN technology. Implementation of a power supply design is simple using these products because of the number of integrated functions they provide, including: • High-voltage primary-side switch; • Primary-side controller; • Secondary-side controller for synchronous rectification;


• Innovative FluxLink isolation technology, which eliminates the need for an optocoupler.


Figure 5: InnoSwitch3 flyback converter ICs are based on Power Integrations’s PowiGaN technology


Real-world application Recognising the advantages of GaN technology in a quasi-resonant flyback converter topology, Future Electronics has developed the new ToboGaN board, providing a useful reference design for potential users considering InnoSwitch3 products in industrial auxiliary power supplies. Te compact ToboGaN design is rated


for use in industrial environments at ambient temperatures to 60°C, and at power levels to 60W. Te ToboGaN board incorporates the


InnoSwitch3-Pro, which offers digital programming capability via an I2


C


interface. Te reference design provides a programmable output voltage between 5V and 20V, and output current up to 3A. Peak efficiency is 95%. Users of the ToboGaN board may program it via a plug-in board providing an I2


C-to-


USB interface. Alternatively, the reference design supports USB Type-C operation using an additional plug-in controller board. Te reference design can also be configured


Table 1: PowiGaN enabled InnoSwitch3 products


for 30W-rated power requirements by changing the flyback transformer and an alternative bulk capacitor, also provided with the ToboGaN board for retrofitting. Te reference design is available free-of-charge through the FTM Board Club at www.my-boardclub.com.


www.electronicsworld.co.uk November/December 2020 39


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