TLE9261-3QX Datasheet, PDF (70/186 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9261-3QX
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:
R = ^U _{I SHUNT}
shunt _ threshold
CC 3 max
(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:
I _{CC 3 =} 110 Ω 105 − 15 mV I _{CC 1}
(a )
(2)
I _{CC 1}
R _SHUNT
I _{CC 3} =
I _{CC 1} ⋅ 110 Ω 105
R _SHUNT
− 15 mV
(b )
Example: A shunt resistor with 470mΩ 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
Data Sheet
70
Rev. 1.1, 2014-09-26