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L6491 датащи(PDF) 19 Page - STMicroelectronics

номер детали L6491
подробное описание детали  Power supply unit
PDF  24 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6491 датащи(HTML) 19 Page - STMicroelectronics

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L6491
Bootstrap driver
24
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 s. In fact:
Equation 4
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 9. Bootstrap driver with external high voltage fast recovery diode
Vdrop
30nC
5
s
--------------- 175
 1V
=
TO LOAD
H.V.
HVG
LVG
CBOOT
DBOOT
BOOT
VCC
OUT



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