Datasheet
Bootstrap driver L6386E
10/19 DocID13989 Rev 4
For example: using a power MOSFET with a total gate charge of 30 nC the drop on the
bootstrap DMOS is about 1 V, if the T
charge
is 5 s. In fact:
Equation 3
V
drop
has to be taken into account when the voltage drop on C
BOOT
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
5s
-------------- - 125 0.8V=
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