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TMCS1101 Scheda tecnica(PDF) 34 Page - Texas Instruments |
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TMCS1101 Scheda tecnica(HTML) 34 Page - Texas Instruments |
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34 / 48 page  34 TMCS1101 SBOS825A – SEPTEMBER 2019 – REVISED MAY 2020 www.ti.com Product Folder Links: TMCS1101 Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated 10.2 Typical Application Inline sensing of inductive load currents, such as motor phases, provides significant benefits to the performance of a control systems, allowing advanced control algorithms and diagnostics with minimal postprocessing. A primary challenge to inline sensing is that the current sensor is subjected to full HV supply-level PWM transients driving the load. The inherent isolation of an in-package Hall-effect current sensor topology helps overcome this challenge, providing high common-mode immunity, as well as isolation between the high-voltage motor drive levels and the low-voltage control circuitry. Figure 46 illustrates the use of the TMCS1101 in such an application, driving the inductive load presented by a three phase motor. Figure 46. Inline Motor Phase Current Sensing 10.2.1 Design Requirements For current sensing of a three-phase motor application, make sure to provide linear sensing across the expected current range, and make sure that the device remains within working thermal constraints. A single TMCS1101 for each phase can be used, or two phases can be measured, and the third phase calculated on the motor-controller host processor. For this example, consider a nominal supply of 5 V but a minimum of 4.9 V to include for some supply variation. Maximum output swings are defined according to TMCS1101 specifications, and a full-scale current measurement of ±20 A is required. Table 3. Example Application Design Requirements DESIGN PARAMETER EXAMPLE VALUE VS,nom 5 V VS,min 4.9 V IIN,FS ±20 A 10.2.2 Detailed Design Procedure The primary design parameter for using theTMCS1101 is selecting the correct sensitivity variant, and because positive and negative current must be measured a bidirectional variant should be selected (A1B-A4B). Further consideration of noise and integration with an ADC can be explored, but is beyond the scope of this application design example. The TMCS1101AxB transfer function is effectively a transimpedance with a variable offset set by VOUT,0A, which is internally set to half of the analog supply as defined by Equation 29. VOUT = IIN × S + VOUT,0A = IIN × S + VS × .05 (29) Design of the sensing solution focuses on maximizing the sensitivity of the device while maintaining linear measurement over the expected current input range. The TMCS1101 has a slightly smaller linear output range to the supply than to ground; therefore, the measurable current range is always constrained by the positive swing to supply, SwingVS. To account for the operating margin, consider the minimum possible supply voltage VS,min. With the previous parameters, the maximum linear output voltage range is the range between VOUT,max and VOUT,0A, as defined by Equation 30. |
Codice articolo simile - TMCS1101_V01 |
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Descrizione simile - TMCS1101_V01 |
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