mc33253 Freescale Semiconductor, Inc, mc33253 Datasheet - Page 12

• Manufacturer Part Number: mc33253
• Description: Full Bridge Pre-driver
• Manufacturer: Freescale Semiconductor, Inc

Over/Under Voltage Shutdown
at V
Protection
polarity is given by the external power FET with the free wheeling diodes, forming a conducting pass from ground to V
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.
MC33253
A differential mode is advised as shown in fig 12:
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
with (a) and (b), the minimum values of R1, R2, R3 and R4 can be calculated.
The under voltage protection becomes active at V
CC2
A protection against double battery and load dump spikes up to 55 V is given by V
above 28 V. If the O/UV protection is activated the outputs are driven low, in order to switch off the FETs.
with R2=R4 and R1=R3,
Freescale Semiconductor, Inc.
For More Information On This Product,
V
R1=R3=227 Ohms and R2=R4=2.27 kOhms
2
(
V
A gain of 10 gives
R
1
1
Figure 12. : Differential A.O.P
+
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R
R
3
2
CC
)
min
R
below 5.5 V and the overvoltage protection is activated at V
4
MC33253
MOTOROLA
=
R
1
2
5
mA
IS
IS
V
-IN
+IN
R
R
2
1
=
+
_
V
A OP
=
2
out
5 ,
10
R
=
k
2
IS
( a )
OUT
R
R
( b )
1
2
(
V
2
V
out
−
CC
V
= 55 V. A protection against reverse
) 1
OUT
maximum is 5V:
CC
above 55 V or
rev3.0 - 12/15
CC
. An