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TLE9263QX Datasheet(PDF) 53 Page - Infineon Technologies AG

Part # TLE9263QX
Description  Dedicated Data Sheets are available for the different product variants
PDF  164 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE9263QX Datasheet(HTML) 53 Page - Infineon Technologies AG

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Data Sheet
53
Rev. 1.1, 2014-09-26
TLE9263QX
External Voltage Regulator 3
8.4
Calculation of RSHUNT
As a independent regulator, the maximum current
I
CC3max where the limit starts and the bit ICC3 > ICC3max is set is
determined by the shunt resistor
R
SHUNT and the Output Current Shunt Voltage Threshold Vshunt_threshold.
The resistor can be calculated as following:
(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:
(2)
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
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
⋅
=



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