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L6387ED Datasheet(PDF) 8 Page - STMicroelectronics |
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L6387ED Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 15 page Bootstrap driver L6387E 8/15 For example: using a power MOS with a total gate charge of 30nC the drop on the bootstrap DMOS is about 1V, if the Tcharge is 5µs. In fact: Vdrop has to be taken into account when the voltage drop on CBOOT is calculated: if this drop is too high, or the circuit topology doesn’t allow a sufficient charging time, an external diode can be used. Figure 3. Bootstrap driver V drop 30nC 5 µs --------------- 125 Ω 0.8V ∼ ⋅ = TO LOAD D99IN1056 H.V. HVG a b LVG HVG LVG CBOOT TO LOAD H.V. CBOOT DBOOT VBOOT VS VS VOUT VBOOT VOUT |
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