User's Manual l MBLX2160A UM 0101 l © 2022, TQ-Systems GmbH
Page 16
3.2.1
Protective circuitry
The protection circuit features the following characteristics:
•
Overcurrent protection by fuse 10 A, slow blow
•
Overvoltage protection diode
•
Reverse polarity protection
•
Filter
Filter
BNX024H01L
Polarity Protection
P-Channel
NVMFS5113PLT1G
Max. 280 W
(12 A)
Power Switch
N-Channel
CSD18504Q5A
Surge Stopper
LT4356
VIN
- switched
- filtered
- protected
10 A
Fuse
Slow Blow
VIN
Typ 24 V
± 10%
VCC3V3
DCDC
LT8609
PMC
Controller
Shunt
Assumption:
10 A permanently
(240 W)
Figure 5:
Block diagram protective circuit
3.2.2
MBLX2160A power-up sequencing
The power-up sequencing of the MBLX2160A is controlled by the PMC.
The status of signals TQMLX_PGOOD and MBLX_PGOOD is also indicated by green LEDs.
Figure 6:
MBLX2160A Power-up sequencing
Typical sequence times are:
t1:
600 … 900 ms
t2:
300 … 500 ms
t3:
60 … 220 ms
3.2.3
Battery
In case of power failure or power down a lithium battery type CR2032 on the MBLX2160A supplies the RTC on the TQMLX2160A
via pin VBAT_RTC (X3-B95), which can be supplied with 2.1 V to 3.7 V, typical 3.0 V.
VBAT_RTC is also routed to X31-16 on the MBLX2160A. This pin can be used as a measuring point or, if the Coin Cell is removed,
as a feed point.
