In the past electronic product design, we often choose to DCDC chips, often encountered in the selection process of DCDC chips have synchronous rectification and asynchronous rectification of two kinds(source: Easybom.) We often see a bootstrap capacitor in such DCDC circuits, often marked on the chip pin BS or BST, as shown in the figure below, Tuoerl Micro’s TMI3494, which chose a 0.1uF capacitor used to bootstrap. So, why is it called bootstrap here? We can analyze it step by step. First of all, based on the Buck topology of the DCDC chip, the bootstrap capacitor is not necessary, such
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