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TMCS1100 データシート(PDF) 32 Page - Texas Instruments

部品番号 TMCS1100
部品情報  TMCS1100 1% High-Precision, Basic Isolation Hall-Effect Current Sensor With 짹600-V Working Voltage
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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TMCS1100 データシート(HTML) 32 Page - Texas Instruments

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S
PSRR
IN
PSRR * (V
5)
S
e
(%)
I
CM
CMRR
IN
CMRR * V
e
(%)
I
OS
OS
I
IN
I
e
(%)
I
Input Current (A)
0
5
10
15
20
25
0
1
2
3
4
5
6
7
8
9
10
D007
RSS Max Error, 25°C
566 0D[ (UURU ±
ƒ&WRƒ&
566 0D[ (UURU ±
ƒ&WR
ƒ&
32
TMCS1100
SBOS820A – SEPTEMBER 2019 – REVISED JUNE 2020
www.ti.com
Product Folder Links: TMCS1100
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Application Information (continued)
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 47 illustrates the RSS maximum total error as a function of input current for a
TMCS1100A2 at room temperature and across the full temperature range with VS of 5 V.
Figure 47. RSS Error vs Input Current
10.1.1.1 Room Temperature Error Calculations
For room-temperature total-error calculations, specifications across temperature and drift are ignored. As an
example, consider a TMCS1100A1 with a supply voltage (VS) of 3.3 V, a VREF of 1.5 V, and a worst-case
common-mode excursion of 600 V to calculate operating-point-specific parameters. Consider a measurement
error due to an external magnetic field of 30 µT, roughly the Earth's magnetic field strength. The full-scale current
range of the device in specified conditions is slightly greater than 28 A; therefore, calculate error at both 25 A
and 12.5 A to highlight error dependence on the input-current level. Table 1 shows the individual error
components and RSS maximum total error calculations at room temperature under the conditions specified.
Relative to other errors, the additional error from CMRR is negligible, and can typically be ignored for total error
calculations.
Table 1. Total Error Calculation: Room Temperature Example
ERROR
COMPONENT
SYMBOL
EQUATION
% MAX TOTAL
ERROR AT IIN =
25 A
% MAX TOTAL
ERROR AT IIN =
12.5 A
Input offset error
eIos
0.24%
0.48%
CMRR error
eCMRR
0.01%
0.02%
PSRR error
ePSRR
0.27%
0.54%


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