High-Frequency DC/DC Conversion using High-Current Bipolar Transistors

This application note discusses the switching capabilities of bipolar transistors, including charge analysis and circuit techniques to permit high-frequency saturated switching. Circuit examples are presented to illustrate speed-up methods, and charts are included to demonstrate the resulting efficiency improvements. The application note also includes turn-off charge vs. bias-point characterization charts for typical high-current, low-V_CE(sat) bipolar devices targeted for low-voltage and battery applications.

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