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The TLD5542-1QV has a fast discharge feature that allows to quickly discharge the output capacitor. During a fast discharge phase the ouput capacitor is getting discharged to the input capacitor and therefore causing a small reverse input current.
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The figure below shows the switching pattern and waveforms during this fast discharge phase.
Read more on fast discharge in the datasheet on pages 27 and 28.
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The figure below shows the switching pattern and waveforms during this fast discharge phase.
Read more on fast discharge in the datasheet on pages 27 and 28.
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