L6392 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6392' PDF : 20 Pages View PDF
Bootstrap driver
L6392
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 = 3---5-0--μ--n--s-C--- ⋅ 120Ω ∼ 0.7V
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 7. Bootstrap driver
DBOOT
VS
HVG
LVG
a
BOOT
H.V.
VOUT
VS
CBOOT
TO LOAD
HVG
LVG
b
BOOT
H.V.
VOUT
CBOOT
TO LOAD
D99IN1067
16/20
Doc ID 14494 Rev 5
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