Data Sheet
53
Rev. 1.00
2017-07-31
TLE9262BQXV33
External Voltage Regulator 3
when the bit
VCC3_LS_ STP_ON
is set and when load sharing is configured (for detailed protection features
see
Chapter 15.7
and
Chapter 16.3
).
Note:
The configuration of the VCC3 voltage regulator behavior must be done immediately after power-up
of the device and cannot be changed afterwards as long as the device is supplied.
Note:
As soon as the bit
VCC3_ON
or
VCC3_LS
is set for the first time, the configuration for VCC3 cannot be
changed anymore. This configuration is valid - also after a SBC Soft Reset - as long as the SBC is
powered.
Note:
If the VCC3 output voltage is supplying external off-board loads, the application must consider the
series resonance circuit built by cable inductance and decoupling capacitor at the load. Sufficient
damping must be provided (e.g. a 100Ohm resistor between the PNP collector and VCC3REF with
10uF capacitor on collector - see also
Figure 19
).
8.2.1
External Voltage Regulator as Independent Voltage Regulator
Configured as an independent voltage regulator the SBC offers with VCC3 a third supply which could be used
as off-board supply e.g. for sensors due to the integrated HV pins VCC3B, VCC3SH, VCC3REF.
This configuration is set and locked by enabling
VCC3_ON
while keeping
VCC3_LS
= 0. VCC3 can be switched
ON or OFF but the configuration cannot be changed anymore. However, the
SPI_FAIL
is not set while trying to
change the configuration.
An overcurrent limitation function is realized with the external shunt (see
Chapter 8.4
for calculating the
desired shunt value) and the output current shunt voltage threshold (
V
shunt_threshold
). If this threshold is
reached, then ICC3 is limited and only the current limitation bit
VCC3_OC
is set (no other reaction) and can be
cleared via SPI once the overcurrent condition is not present anymore. If the overcurrent limitation feature is
not needed, then connect the pins VCC3SH and VS together.
In this configuration VCC3 has the undervoltage signalization enabled and an undervoltage event is signaled
with the bit
VCC3_UV
in the
SUP_STAT_2
SPI register.
Note:
To avoid undesired current consumption increase of the device it must be ensured that VCC3 is not
connected to VCC1 in this configuration.
Table 12 External Voltage Regulator State by SBC Mode
SBC Mode
Load Sharing Mode
1)
1) Behaves as VCC1 and has to be configured in SBC Normal Mode
Independent Voltage Regulator
INIT Mode
OFF
OFF
Normal Mode
Configurable
Configurable
Stop Mode
OFF/Fixed
2)
2) Load Sharing operation in SBC Stop Mode is by default disabled for power saving reasons but
VCC3_LS
bit will stay
set. However, it can be also configured via the SPI bit
VCC3_LS_ STP_ON
to stay enabled in SBC Stop Mode.
Fixed
Sleep Mode
OFF
Fixed
Restart Mode
ON or ramping
Fixed
Fail-Safe Mode
OFF
OFF
