Data Sheet
56
Rev. 1.00
2017-07-31
TLE9262BQXV33
External Voltage Regulator 3
8.4
Calculation of R
SHUNT
As a independent regulator, the maximum current
I
CC3max
where the limit starts and the bit
I
CC3
>
I
CC3max
is set is
determined by the shunt resistor
R
SHUNT
and the Output Current Shunt Voltage Threshold
V
shunt_threshold
.
The resistor can be calculated as following:
(8.1)
If VCC3 is configured for load sharing, then the shunt resistor determines the load sharing ratio between VCC1
and VCC3. The ratio can be calculated as following:
(8.2)
Example: A shunt resistor with 470m
Ω
and a load current of 100mA out of VCC1 would result in
I
CC3
= 191mA.
8.5
Unused Pins
In case the VCC3 is not used in the application, it is recommended to connect the unused pins of VCC3 as
followed:
•
Connect VCC3SH to VS or leave open;
•
Leave VCC3B open;
•
Leave VCC3REF open
•
Do not enable the VCC3 via SPI as this leads to increased current consumption
max
3
_
CC
threshold
shunt
SHUNT
I
U
R
=
)
(
15
105
110
1
1
3
a
R
I
mV
I
I
SHUNT
CC
CC
CC
−
Ω
=
)
(
15
105
110
1
3
b
R
mV
I
I
SHUNT
CC
CC
−
Ω
⋅
=
