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TMCS1101 Datenblatt(PDF) 31 Page - Texas Instruments

Teilenummer TMCS1101
Bauteilbeschribung  TMCS1101 1.5% Precision, Basic Isolation Hall-Effect Current Sensor With 짹600-V Working Voltage
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TMCS1101 Datenblatt(HTML) 31 Page - Texas Instruments

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TMCS1101
www.ti.com
SBOS825A – SEPTEMBER 2019 – REVISED MAY 2020
Product Folder Links: TMCS1101
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Application Information (continued)
10.1.1 Total Error Calculation Examples
Total error can be calculated for any arbitrary device condition and current level. Error sources considered should
include input-referred offset current, power-supply rejection, input common-mode rejection, sensitivity error,
nonlinearity, and the error caused by any external fields. Compare each of these error sources in percentage
terms, as some are significant drivers of error and some have inconsequential impact to current error. Offset
(Equation 22), CMRR (Equation 23), PSRR (Equation 24), and external field error (Equation 25) are all referred
to the input, and so, are divided by the actual input current IIN to calculate percentage errors. For calculations of
sensitivity error and nonlinearity error, the percentage limits explicitly specified in the Electrical Characteristics
table can be used.
(22)
(23)
(24)
(25)
When calculating error contributions across temperature, only the input offset current and sensitivity error
contributions vary significantly. For determining offset error over a given temperature range (ΔT), use
Equation 26 to calculate total offset error current. Sensitivity error is specified for both –40°C to 85°C and –40°C
to 125°C. The appropriate specification should be used based on application operating ambient temperature
range.
(26)
To accurately calculate the total expected error of the device, the contributions from each of the individual
components above must be understood in reference to operating conditions. To account for the individual error
sources that are statistically uncorrelated, a root sum square (RSS) error calculation should be used to calculate
total error. For the TMCS1101, only the input referred offset current (IOS), CMRR, and PSRR are statistically
correlated. These error terms are lumped in an RSS calculation to reflect this nature, as shown in Equation 27 for
room temperature and Equation 28 for across a given temperature range. The same methodology can be applied
for calculating typical total error by using the appropriate error term specification.
(27)
(28)
The total error calculation has a strong dependence on the actual input current; therefore, always calculate total
error across the dynamic range that is required. These curves asymptotically approach the sensitivity and
nonlinearity error at high current levels, and approach infinity at low current levels due to offset error terms with
input current in the denominator. Key figures of merit for any current-measurement system include the total error
percentage at full-scale current, as well as the dynamic range of input current over which the error remains below
some key level. Figure 45 illustrates the RSS maximum total error as a function of input current for a
TMCS1101A2B at room temperature and across the full temperature range with VS of 5 V.


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