l6392 STMicroelectronics, l6392 Datasheet - Page 14

• Manufacturer Part Number: l6392
• Description: High-voltage High And Low Side Driver
• Manufacturer: STMicroelectronics

Bootstrap driver
14/19
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 T
V
is too high, or the circuit topology doesn’t allow a sufficient charging time, an external diode
can be used.
Figure 6.
drop
V
S
has to be taken into account when the voltage drop on C
D
BOOT
Bootstrap driver
a
HVG
LVG
V
BOOT
V
OUT
drop
H.V.
=
charge
30nC
-------------- - 120Ω 0.7V
C
TO LOAD
BOOT
5µs
is 5 µs. In fact:
⋅
V
S
∼
BOOT
b
HVG
LVG
is calculated: if this drop
BOOT
V
OUT
H.V.
D99IN1067
L6392
C
TO LOAD
BOOT