TPS2480PW datasheet(42/60 Pages) TI2

42 / 60 page

Max_Current=Current_LSB

32767

Max_Current=62.2573

Max_ShuntVoltage=Max_Current_Before_Overflow

SHUNT

Max_ShuntVoltage=0.0622573

MaximumPower=Max_Current_Before_Overflow

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

≥ VSHUNT_MAX

Max_ShuntVoltage_Before_Overflow = VSHUNT_MAX

Else

Max_ShuntVoltage_Before_Overflow= Max_ShuntVoltage

End If

(Note that Max_ShuntVoltage is less than VSHUNT_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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