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參數(shù)資料
| 型號(hào)： | MC33883R2 |
| 廠商： | Motorola, Inc. |
| 英文描述： | H-Bridge Gate Driver IC |
| 中文描述： | H橋門(mén)驅(qū)動(dòng)器集成電路 |
| 文件頁(yè)數(shù)： | 11/20頁(yè) |
| 文件大?。?/td> | 556K |
| 代理商： | MC33883R2 |
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33883
11
APPLICATION REQUIREMENTS
Turn-On
For turn-on, the current required to charge the gate source
capacitor C
iss
in the specified time can be calculated as follows:
I
P
=Q
g
/t
r
=80nC/80ns
≈
1.0A
Where Q
g
is power MOSFET gate charge and t
r
is peak current
for rise time.
Turn-Off
The peak current for turn-off can be obtained in the same
way as for turn-on, with the exception that peak current for fall
time, t
f
, is substituted for t
r
:
I
P
=Q
g
/t
f
=80nC/80ns
≈
1.0A
In addition to the dynamic current required to turn off or on
the MOSFET, various application-related switching scenarios
must be considered. These scenarios are presented in
Figure 5
. In order to withstand high dV/dt spikes, a low resistive
path between gate and source is implemented during the OFF-
state.
Figure 5. OFF-State Driver Requirement
Driver Requirement:
Low Resistive Gate-
Source Path During
OFF-State
Flyback spike charges low-
side gate via C
rss
charge
current I
rss
up to 2.0 A.
Causes increased uncon-
trolled turn-on of low-side
MOSFET.
C
iss
C
iss
C
rss
C
rss
V
BAT
Driver Requirement:
Low Resistive Gate-
Source Path During
OFF-State. High Peak
Sink Current Capability
Flyback spike pulls down
high-side source V
GS
.
Delays turn-off of high-
side MOSFET.
C
iss
C
iss
C
rss
C
rss
V
BAT
Driver Requirement:
High Peak Sink Current
Capability
Flyback spike charges low-
side gate via C
rss
charge
current I
rss
up to 2.0 A.
Delays turn-off of low-side
MOSFET.
C
iss
C
iss
C
rss
C
rss
V
BAT
Driver Requirement:
Low Resistive Gate-
Source Path During
OFF-State
C
iss
C
iss
C
rss
C
rss
V
BAT
Flyback spike pulls down
high-side source V
GS
.
Causes increased uncon-
trolled turn-on of high-side
MOSFET.
OFF
OFF
OFF
OFF
GATE_LS
I
LOAD
L1
I
LOAD
L1
I
LOAD
L1
I
LOAD
L1
I
rss
V
GATE
V
GATE
-V
DRN
GATE_HS
GATE_LS
GATE_HS
GATE_HS
GATE_LS
GATE_HS
GATE_LS
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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