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參數資料
| 型號： | MC33253 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Full Bridge Pre-Driver |
| 中文描述： | 全橋預驅動器 |
| 文件頁數： | 12/15頁 |
| 文件大小： | 615K |
| 代理商： | MC33253 |
MC33253
rev3.0 - 12/15
MC33253
A differential mode is advised as shown in fig 12:
Figure 12. : Differential A.O.P
To minimize the perturbations, impedance seen by the A.O.P inputs may be as low as possible.
Knowing the maximum output current (2mA), the minimum value of (R1+R2) can be deduced when V
OUT
maximum is 5V:
with (a) and (b), the minimum values of R1, R2, R3 and R4 can be calculated.
R1=R3=227 Ohms and R2=R4=2.27 kOhms
Over/Under Voltage Shutdown
The under voltage protection becomes active at V
CC
below 5.5 V and the overvoltage protection is activated at V
CC
above 55 V or
at V
CC2
above 28 V. If the O/UV protection is activated the outputs are driven low, in order to switch off the FETs.
Protection
A protection against double battery and load dump spikes up to 55 V is given by V
CC
= 55 V. A protection against reverse
polarity is given by the external power FET with the free wheeling diodes, forming a conducting pass from ground to V
CC
. An
additional protection is not provided within the circuit. There is a temperature shut down protection per each half bridge. It protects
the circuitry against temperature damage by blocking the output drives.
+
_AOP
V
2
R
3
R
4
R
1
R
2
V
1
V
out
IS
+IN
IS
OUT
IS
-IN
with R2=R4 and R1=R3,
)
V
2
(
1
2
V
R
R
V
out
=
A gain of 10 gives
10
1
2
=
R
R
( a )
k
mA
V
R
R
5
2
5
)
(
min
2
1
=
=
+
( b )
F
For More Information On This Product,
Go to: www.freescale.com
n
.
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