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VND5E008ASP-E Datasheet(PDF) 22 Page - STMicroelectronics |
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VND5E008ASP-E Datasheet(HTML) 22 Page - STMicroelectronics |
22 / 33 page Application information VND5E008ASP-E 22/33 DocID023813 Rev 4 3.3.1 Short to VCC and off-state open-load detection Short to VCC A short circuit between VCC and output is indicated by the relevant current sense pin set to VSENSEH during the device off-state. Small or no current is delivered by the current sense during the on-state depending on the nature of the short circuit. Off-state open-load with external circuitry Detection of an open-load in off mode requires an external pull-up resistor RPU connecting the output to a positive supply voltage VPU. It is preferable VPU to be switched off during the module standby mode in order to avoid the overall standby current consumption to increase in normal conditions, i.e. when load is connected. For proper open-load detection in off-state, the external pull-up resistor must be selected according to the following formula: For the values of VOLmin,VOLmax, and IL(off2) see Table 10: Open-load detection (8 V < VCC < 18 V). V OUT Pull-up_ON R PD VPU ⋅ R PU RPD IL(off2) ⋅⋅ – R PU P PD + ------------------------------------------------------------------------------------ V OLm ax > 4V == |
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