Datasheet

Max_Current=Current_LSB 32767´
Max_Current=62.2573
Max_ShuntVoltage=Max_Current_Before_Overflow R´
SHUNT
Max_ShuntVoltage=0.0622573
MaximumPower=Max_Current_Before_Overflow V´
BUS_MAX
MaximumPower=1992
Corrected_Full_Scale_Cal=trunc
Cal MeasShuntCurrent
TPS2480/81_Current
´
Corrected_Full_Scale_Cal=21422
TPS2480
TPS2481
SLUS939B –APRIL 2010–REVISED DECEMBER 2010 www.ti.com
7. Compute the maximum current and shunt voltage values (before overflow), as shown by Equation 44 and
Equation 45. Note that both Equation 44 and Equation 45 involve an If - then condition.
(44)
If Max_Current ≥ Max Possible_I then
Max_Current_Before_Overflow = MaxPossible_I
Else
Max_Current_Before_Overflow = Max_Current
End If
(Note that Max_Current is less than MaxPossible_I in this example.)
Max_Current_Before_Overflow = 62.2573 (Note: This result is displayed by software as seen in Figure 27.)
(45)
If Max_ShuntVoltage ≥ V
SHUNT_MAX
Max_ShuntVoltage_Before_Overflow = V
SHUNT_MAX
Else
Max_ShuntVoltage_Before_Overflow= Max_ShuntVoltage
End If
(Note that Max_ShuntVoltage is less than V
SHUNT_MAX
in this example.)
Max_ShuntVoltage_Before_Overflow = 0.0622573 (Note: This result is displayed by software as seen in
Figure 27.)
8. Compute the maximum power with equation 8.
(46)
9. (Optional second calibration step.) Compute the corrected full-scale calibration value based on measured
current.
TPS2480/81_Current = 25.2472
MeaShuntCurrent = 25.09
(47)
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