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UM1556 Datasheet(PDF) 35 Page - STMicroelectronics |
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UM1556 Datasheet(HTML) 35 Page - STMicroelectronics |
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35 / 87 page  UM1556 Analogue current sense Doc ID 023520 Rev 2 35/87 Figure 31. VND5012A current sense voltage behavior – hard short to GND occurred (20 m Ω), thermal shutdown was reached 344 ms after short-circuit to GND 2.9 Open load detection in off-state – external circuitry for analogue M0-5 HSD The following schematic shows a simple way to perform an open-load diagnostics in off- state for analogue HSDs. In case of a missing load in off-state the RSENSE resistor is supplied through R5, R6 and D1. Then the voltage increase on RSENSE is about 2 V (divider R5, R6, RSENSE), which can be recognized by a µC as open-load in off-state. In on-state conditions (or if current sense disable signal is high) the influence of R5, R6 is suppressed by the conducting transistor T1 (anode of D1 is shorted to GND). GAPGMS00108 |
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