Datasheet

L6384E Bootstrap driver
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For example: using a power MOS with a total gate charge of 30nC the drop on the bootstrap
DMOS is about 1V, if the T
charge
is 5µs. In fact:
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
5µs
-------------- -
125 0.8V=
TO LOAD
D99IN1067
H.V.
HVG
ab
LVG
HVG
LVG
C
BOOT
TO LOAD
H.V.
C
BOOT
D
BOOT
V
BOOT
V
S
V
S
V
OUT
V
BOOT
V
OUT