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L6386AD 数据表(PDF) 9 Page - STMicroelectronics |
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L6386AD 数据表(HTML) 9 Page - STMicroelectronics |
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9 / 17 page  L6386AD Bootstrap driver 9/17 For example: using a power MOS with a total gate charge of 30 nC the drop on the bootstrap DMOS is about 1 V, if the Tcharge is 5 µs. 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 4. Bootstrap driver V drop 30nC 5 µs --------------- 125 Ω 0.8V ∼ ⋅ = TO LOAD D99IN1056 H.V. HVG ab LVG HVG LVG CBOOT TO LOAD H.V. CBOOT DBOOT VBOOT VS VS VOUT VBOOT VOUT |
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