Flyback converters are one of the most popular power conversion topologies for isolated DC/DC applications below the 120W to 150W range in every market segment. And in many higher-power systems flyback converters are used as auxiliary power supplies or to supply bias for high-performance gate drivers, especially when floating drivers require isolated bias rails. The latest industry trend for consumer applications – especially for USB Power Delivery – is integrated power stages where the controller, driver and the high-voltage primary side power transistor are all co-located in the same package offering a complete solution for the high-voltage side of the converter. This type of implementation is popular due to its simplicity, ease of use and the need for higher power density – in other words smaller size and weight – which is enabled by best in class efficiency. This presentation will introduce a new class of integrated flyback power stages. These new, highly integrated devices from Texas Instruments use state-of-the-art control algorithms and TI’s own eMode GaN power switches. They offer many industry-first features such as high-voltage startup and keep alive power delivery for the controller itself and can generate their own bias power, providing input and output voltage sensing without the traditional auxiliary winding of the flyback transformer or the need of high-voltage resistor dividers and many more. This presentation will explain how these advanced features can minimize the last bits of wasted power loss in the flyback converter and serve as the enablers for higher efficiency and power density.
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