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L6395 Datasheet(PDF) 12 Page - STMicroelectronics

Part # L6395
Description  Industrial drives and fans
PDF  16 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6395 Datasheet(HTML) 12 Page - STMicroelectronics

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Bootstrap driver
L6395
12/16
DocID024048 Rev 2
For example: using a power MOSFET with a total gate charge of 30 nC, the drop on the
bootstrap DMOS is about 1 V, if the Tcharge is 5 s.
Equation 4
Vdrop must be taken into account when the voltage drop on CBOOT is calculated: whether
this drop is too high, or the circuit topology does not allow a sufficient charging time, an
external diode can be used.
Figure 6. Bootstrap driver with high voltage fast recovery diode
Figure 7. Bootstrap driver with internal charge pump
Vdrop
30nc
5s
------------ 120
 0.7V
=
TO LO AD
H.V.
HVG
LVG
C BOOT
D BOOT
BOOT
VCC
OUT
AM16537v1
HVG
LVG
TO LO AD
H. V.
CBO O T
V CC
OUT
BO O T
AM16538v1



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