Datasheet

Error Correction

Corresponding Average

Current Register Setting

(Hex)

Corresponding Ideal Average

Current with a 1 Ω ext. Sense

Resistor

0 0A6 200 mA

1 14D 400 mA

2 1F3 600 mA

3 29A 800 mA

4 340 1000 mA

TLE 7241E

Functional Description and Electrical Characteristics

Data Sheet 45 Rev. 1.1, 2009-01-19

For example:

• Measured average switch threshold at 0A6

during Infineon production test = 207 mV

• Ideal average switch threshold at 0A6

= 199.6 mV

• Error Correction = -7.4 mV / (1.2 mV/count) = -6 counts

• The contents of the error correction register are -6 or FA

The contents of the error correction registers can be used by the application

microcontroller to improve the accuracy of the average switch points. In the above

example, when the microcontroller requests an average current of 200 mA (assuming a

1 Ω sense resistor), the command sent should be 0A6 (ideal) - 6 (error correction) = 0A0.

For current commands between the 5 measured operating points, the microprocessor

can use linear (or more complex) interpolation to calculate the appropriate error

correction values.