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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VN7140AS12TR датащи(PDF) 26 Page - STMicroelectronics |
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VN7140AS12TR датащи(HTML) 26 Page - STMicroelectronics |
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26 / 39 page  Application information VN7140AS12 26/39 DocID029756 Rev 2 Normal operation (channel ON, no fault, SEn active) While device is operating in normal conditions (no fault intervention), VSENSE calculation can be done using simple equations Current provided by Multisense output: ISENSE = IOUT/K Voltage on RSENSE: VSENSE = RSENSE · ISENSE = RSENSE · IOUT/K Where: VSENSE is voltage measurable on RSENSE resistor ISENSE is current provided from Multisense pin in current output mode IOUT is current flowing through output K factor represents the ratio between PowerMOS cells and SenseMOS cells; its spread includes geometric factor spread, current sense amplifier offset and process parameters spread of the overall circuitry the specifying ratio between IOUT and ISENSE. Failure flag indication In case of power limitation/overtemperature, the fault is indicated by the Multisense pin which i s switched to a “current limited” voltage source, VSENSEH. In any case, the current sourced by the Multisense in this condition is limited to ISENSEH. The typical behavior in case of overload or hard short circuit is shown in Waveforms section. Figure 34: Analogue HSD – open-load detection in off-state |
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