5.4 Bootstrap Diode Selection

The chosen bootstrap diode (D_BS) should be rated higher than the maximum rail voltage since the diode must be able to block the full rail voltage and any spikes seen at the VS node. The diode’s current rating is simply the product of total charge (QT) required by the HVIC and the switching frequency. An ultrafast recovery diode is recommended to minimize any delay of charging the C_BS capacitor. A 1A ultrafast recovery diode is typical for MCP14H2304 applications.

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