L6387E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6387E' PDF : 15 Pages View PDF
Bootstrap driver
L6387E
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 = -3--5-0--µ--n--s-C--- ⋅ 125Ω ∼ 0.8V
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
DBOOT
VS
VBOOT
H.V.
HVG
VOUT
CBOOT
TO LOAD
LVG
a
VS
VBOOT
H.V.
HVG
VOUT
CBOOT
TO LOAD
LVG
b
D99IN1056
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