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LED Driver ICs Forum Discussions

j_oehmen
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Moderator 10 replies posted 5 replies posted 10 questions asked
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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.
.4784.attach

The figure below shows the switching pattern and waveforms during this fast discharge phase.
4785.attach

Read more on fast discharge in the datasheet on pages 27 and 28.
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