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BTN8962 データシート(PDF) 31 Page - Infineon Technologies AG |
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BTN8962 データシート(HTML) 31 Page - Infineon Technologies AG |
31 / 94 page ![]() • dkILIS-max-C-T = 1.03 (blue @ -40 °C) • dkILIS-min-C-old-T = 0.9685 (green @ -40 °C) • dkILIS-max-H-T = 1.027 (green @ 150 °C) • dkILIS-min-H-old-T = 0.972 (blue @ 150 °C) After temperature compensation, the min. and max. values are dkILIS-min-H-old-T and dkILIS-max-C-T. Ultimately, a current measurement with a precision of ±3% could be achieved! If higher tolerances are acceptable, the temperature measurement can be less precise. 4.4.1 An example of the IIS failure with a rough temperature estimation Assuming the dkILIS was calibrated during production at 25 °C, the IIS measurement failure could be reduced to ±6%, only by estimating if the temperature is above or below 25 °C. This estimation could be done e.g. by using the temperature characteristic of the IIS-offset, which is included in the data sheet. Temperature below 25° C: • dkILIS-max-C = 1.08 (blue @ -40 °C) • dkILIS-min-25°C = 1 Reducing the min. values with the -3% aging (multiplying with 0.97) the following values will be calculated: • dkILIS-max-C = 1.08 (blue @ -40 °C) • dkILIS-min-25°C-old = 0.97 For temperatures above 25 °C the calculation method is essentially the same. Ultimately, a current measurement with a precision of ±6% could be achieved without any external temperature measurement! 4.5 IS-pin current sensing and fault detection The BTN89xy provides several additional sense and diagnosis functionalities, which will be explained here. 4.5.1 Current sensing concepts in applications In comparison to its predecessor BTN79xy, the BTN89xy family's current sense output functionality has an advanced feature. For illustration purposes, both the BTN7960 and the BTN8960 were deployed in the same high-side switching scenario, where an inductive load to ground was toggled with a duty cycle of 50%. Both measurements were conducted with the Infineon “NovalithIC™ Demo Board V2.2”. The resulting measurements are shown in Figure 26 for the BTN7960 and in Figure 25 for the BTN8960. As described in Figure 21, both types have a similar behavior in the case of an error. Instead, their current sense functionality differs in normal operating mode. While the BTN79xy blanks the IS output to 0A when the high-side MOSFET is switched off, the BTN89xy provides the offset current IIS(offset) instead. For monitoring purposes, the behavior of both the BTN79xy and the BTN89xy can be used for continuous current monitoring, even in freewheeling mode: In bi-directional motor applications with two BTN89xy, the freewheeling current can be monitored at the high-side MOSFET in forward direction. As shown in Figure 24, the freewheeling current IFW,HS can be observed with both high-side MOSFETs being closed. In the scenario shown, the IS output of the left BTN89xy provides the current dependent signal, while the IFW,HS flows through the right BTN89xy in reverse direction. BTN8960 /62 /80 /82 High Current PN Half Bridge Current Sense Improvement Application Note 31 Rev. 0.6 2017-02-21 |
同様の部品番号 - BTN8962 |
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同様の説明 - BTN8962 |
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