TLE9263QX
External Voltage Regulator 3
Table 12
External Voltage Regulator State by SBC Mode
SBC Mode
INIT Mode
Load Sharing Mode1)
Independent Voltage Regulator
OFF
OFF
Normal Mode
Stop Mode
Configurable
OFF/Fixed2)
OFF
Configurable
Fixed
Sleep Mode
Restart Mode
Fail-Safe Mode
Fixed
ON or ramping
OFF
Fixed
OFF
1) Behaves as VCC1 and has to be configured in SBC Normal Mode
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.
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 over current 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 (Vshunt_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 over current condition is not present anymore. If the over current limitation feature is not needed, then connect
the pins VCC3SH and VS together.
In this configuration VCC3 has the under voltage signalization enabled and an under voltage 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.
Data Sheet
50
Rev. 1.1, 2014-09-26
INFINEON [ Infineon ]
