User's Manual l MBa7x UM 0101 l © 2020, TQ-Systems GmbH
Page 21
4.1.7.1
Protective circuitry
V
IN
of the MBa7x also supplies the 3.3 V / 5 V and the 12 V buck regulators on the MBa7x.
The protective circuit (Figure 9) has the following characteristics:
•
Fuse, 4 A, slow blow
•
Excess voltage protection diode
•
PI filter
•
Inverse-polarity protection
•
Capacitors for voltage smoothing
Figure 9:
Protective circuit for V
IN
Table 16:
Characteristics of protective circuit
Parameter
Min.
Typ.
Max.
Overcurrent limitation by fuse (slow blow)
–
4 A
–
Excess voltage limitation by SMBJ24CA
26.7 V
–
26.9 V
