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Reference.org
Flyback transformer
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<p>A flyback transformer (FBT), also called a line output transformer (LOPT), is a special type of electrical <a href="/facts/Transformer/EYYfXWrF">transformer</a>. It was initially designed to generate high-voltage <a href="/facts/Sawtooth_wave/3QA8wW0h">sawtooth</a> signals at a relatively high frequency. In modern applications, it is used extensively in <a href="/facts/Switched-mode_power_supply/YKcyRBtP">switched-mode power supplies</a> for both low (3 V) and high voltage (over 10 kV) supplies. </p>