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| DRV8702D-Q1 Datasheet, PDF (28/66 Pages) Texas Instruments – Automotive Half-Bridge Gate Driver | |||
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DRV8702D-Q1, DRV8703D-Q1
SLVSDX8 â MARCH 2017
High-side
gate drive
current
ISTRONG
tDRIVE
High-side
VGS
Low-side
gate drive
current
IHOLD
IDRIVE(SNK)
Low-side
VGS
IHOLD
www.ti.com
IDRIVE(SNK)
ISTRONG
ISTRONG
tDRIVE
IHOLD
Figure 38. Gate Driver Output to Control External FETs
7.3.6.1 Miller Charge (QGD)
When a FET gate turns on, the following capacitances must be charged:
⢠Gate-to-source charge, QGS
⢠Gate-to-drain charge, QGD (Miller charge)
⢠Remaining QG
The FET output is slewing primarily during the QGD charge.
24 V
10
25
D
VGHS
8
20
G
6
15
GH
Predrive
4
10
SH
2
5
S
10
20
30
40
50
QGS
QGD
Gate Charge (nC)
Figure 39. FET Gate Charging Profile
28
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Product Folder Links: DRV8702D-Q1 DRV8703D-Q1
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