S = Slope (V/A)

best fit linear

8

TMCS1100

SBOS820 – SEPTEMBER 2019

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8 Parameter Measurement Information

8.1 Accuracy Parameters

The ideal first-order transfer function of the TMCS1100 is given by Equation 1, where the output voltage is a

linear function of input current. The accuracy of the device is quantified both by the error terms in the transfer

function parameters, as well as by nonidealities that introduce additional error terms not in the simplified linear

model.

where

•

•

S is the ideal sensitivity of the device.

•

•

(1)

8.1.1 Sensitivity, Sensitivity Error, and Drift

Sensitivity is the proportional change in the sensor output voltage due to a change in the input conductor current.

This sensitivity is the slope of the first-order transfer function of the sensor, as shown in Figure 1. The sensitivity

of the TMCS1100 is tested and calibrated at the factory for high accuracy.

Figure 1. Sensitivity, Offset, and Nonlinearity Error

Deviation from ideal sensitivity is quantified by sensitivity error. Sensitivity error is defined as the percent

variation of the best-fit measured sensitivity from the ideal sensitivity, based on the variant of the TMCS1100.

When specified over a temperature range, this is the worst-case sensitivity error at any temperature within the

range.

where

•

•

•

(2)