User's Manual l MBa57xx UM 0100 l © 2020, TQ-Systems GmbH
Page 18
4.1.7.1
Protective circuitry
V
IN
of the MBa57xx also supplies the 3.3 V / 5 V and the 12 V switching regulators on the MBa57xx.
The protective circuit (Illustration 8) has the following characteristics:
•
Fuse, 4 A, slow blow
•
Excess voltage protection diode
•
PI filter
•
Inverse-polarity protection
•
Capacitors for voltage smoothing
Illustration 8:
Protective circuit for V
IN
Table 15:
Characteristics of protective circuit
Parameter
Min.
Typ.
Max.
Overcurrent limitation by fuse (slow blow)
–
4 A
–
Excess voltage limitation by SMBJ24CA
26.7 V
–
29.5 V
4.1.7.2
Power consumption
The MBa57xx, including a TQMa57xx, consumes 85 W under full load (all supply voltages are loaded with maximum current, e.g.
by connecting devices at the pin headers). The power supply used must be specified accordingly. In most applications, however,
the power consumption will be significantly lower.
4.1.7.3
Power supply connectors
Table 16:
Power supply connectors
Connector
Manufacturer / Number
Description
X23
Cui Stack / PJ-102BH
DC jack 2.5 mm / 5.5 mm, nominal: 5 A / 24 V
X24
Lumberg / KRM2
2-pin screw terminal, 250 V / 15 A
