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UM1556 Fiches technique(PDF) 23 Page - STMicroelectronics |
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UM1556 Fiches technique(HTML) 23 Page - STMicroelectronics |
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23 / 87 page  UM1556 Analogue current sense Doc ID 023520 Rev 2 23/87 2 Analogue current sense 2.1 Introduction With the introduction of the novel VIPower M0-5 technology, important improvements have been introduced to the analog current sense operation. The block diagram of a M0-5 High Side Drive with analog current sense is reported in Figure 24. In line with the previous generations, the current sense block has a double function: ● Current mirror of the load current in normal operation. This delivers a current proportional to the load current according to a known ratio named K ● Diagnostics flag in fault conditions. This delivers a fixed voltage with a certain current capability in case of overtemperature conditions. The current delivered by the current sense circuit can be easily converted to a voltage by means of an external sense resistor, thus allowing continuous load monitoring and abnormal-condition detection. Figure 24. M0-5 High Side Driver with analogue current sense – block diagram 2.2 Simplified principle of operation The simplified block diagram of the M0-5 analog current sense is shown in Figure 25. |
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