Parameter definitions

TSC103

16/25

DocID16873 Rev 3

5.5

Input offset drift versus temperature

The input voltage drift versus temperature is defined as the maximum variation of Vos with

respect to its value at 25 °C over the temperature range. It is calculated as follows:

with Tmin < Tamb < Tmax.

Figure 19 provides a graphical definition of the input offset drift versus temperature. On this

chart, Vos is always within the area defined by the maximum and minimum variation of Vos

versus T, and T = 25 °C is considered to be the reference.

Figure 19. Input offset drift versus temperature (Av = 50 V/V)

5.6

Output voltage accuracy

The output voltage accuracy is the difference between the actual output voltage and the

theoretical output voltage. Ideally, the current sensing output voltage should be equal to the

input differential voltage multiplied by the theoretical gain, as in the following formula.

Vout-th = Av.Vsense

The actual value is very slightly different, mainly due to the effects of:

•

the input offset voltage Vos

•

the non-linearity

ΔVos

ΔT

---------------max

Vos Tamb

() Vos 25° C

()

–

Tamb 25° C

–

---------------------------------------------------------------------

=

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

-60

-40

-20

0

20

40

60

80

100 120 140

T (°C)