SBOSA24 Data sheet

SBOSA24A July 2023 – December 2023 TMCS1123

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DVG|10
- MPSS146B

Thermal pad, mechanical data (Package|Pins)

Orderable Information

9.1.1.1 Room-Temperature Error Calculations

For room-temperature total error calculations, specifications across temperature and drift are ignored. As an example, consider a TMCS1123B2A with a supply voltage (V_S) of 3.1V and a worst-case common-mode excursion of 600V to calculate operating-point-specific parameters. Consider a measurement error due to an external 400µT magnetic field generated by a 20A_DC current flowing through an adjacent trace or conductor that is 10mm away. The full-scale current range of the device in specified conditions is slightly greater than ±31A, as shown in the Device Comparison table. In this case, the calculating error at both 25A and 12.5A highlights error dependencies on the input-current level. Table 9-1 shows the individual error components and RSS maximum total error calculations at room temperature under the conditions specified. Relative to other errors, the additional errors from CMRR, external ambient magnetic fields B_EXT and nonlinearity are negligible, and can typically be excluded from total error calculations.

Table 9-1 Total Error Calculation: Room Temperature Example

ERROR COMPONENT	SYMBOL	EQUATION	ERROR AT I_IN = 25 A	ERROR AT I_IN = 12.5 A
Input offset error	e_Ios	$e_{I o s} = \frac{I_{O S}}{I_{I N}} \times 100 % = \frac{V_{O E}}{S \times I_{I N}} \times 100 % = \frac{\pm 1.5 m V}{50 m V / A \times I_{I N}} \times 100 %$	±0.12%	±0.24%
PSRR error	e_PSRR	$e_{P S R R} = \frac{P S R R \times (V_{S} - 3.3)}{I_{I N}} \times 100 %$	±0.04%	±0.07%
CMRR error	e_CMRR	$e_{C M R R} = \frac{C M R R \times V_{C M}}{I_{I N}} \times 100 %$	±0.01%	±0.02%
External Field error	e_Bext	$e_{B e x t} = \frac{B_{E X T} \times C M F R}{I_{I N}} \times 100 %$	±0.02%	±0.03%
Sensitivity error	e_S	Specified in Electrical Characteristics	±0.4%	±0.4%
Nonlinearity error	e_NL	Specified in Electrical Characteristics	±0.10%	±0.10%
RSS total error	e_RSS	$e_{R S S} = \sqrt{{(e_{I o s} + e_{P S R R} + e_{C M R R})}^{2} + {(e_{B e x t})}^{2} + {(e_{S})}^{2} + {(e_{N L})}^{2}}$	0.45%	0.53%