Preliminary User's Manual l MBLS1012AL UM 0001 l © 2019, TQ-Systems GmbH
Page 7
4.1.3
Protective circuit
The input supply of the MBLS1012AL supplies the 3.3 V / 5 V regulators.
The protection circuit (see Illustration 3) features the following characteristics:
•
Overcurrent protection by fuse 4 A, slow blow
•
Overvoltage protection diode
•
PI filter
•
Reverse polarity protection by MOSFET
•
Capacitors for voltage smoothing
Power IN
Fuse
Filter
Reverse
Polarity
Protection
TVS Diode
Illustration 3:
Block diagram protective circuit
The protective circuit has the following electrical characteristics:
Table 4:
Parameter protective circuit
Parameter
Min.
Typ.
Max.
Unit
Overcurrent limitation by fuse (slow blow)
–
4
–
A
Overvoltage limitation
28.9
–
42.1
V
Illustration 4:
Positon of protective circuit
