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VN5E025MJ-E Datasheet(PDF) 23 Page - STMicroelectronics |
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VN5E025MJ-E Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 34 page  DocID16373 Rev 2 23/35 VN5E025MJ-E Application information 33 values. This shift will vary depending on how many devices are ON in the case of several high side drivers sharing the same RGND. If the calculated power dissipation requires the use of a large resistor, or several devices have to share the same resistor, then ST suggests using solution 2 below. 3.1.2 Solution 2: diode (DGND) in the ground line Note that a resistor (RGND = 1kΩ) should be inserted in parallel to DGND if the device drives an inductive load. This small signal diode can be safely shared amongst several different HSDs. Also in this case, the presence of the ground network will produce a shift ( ≈ 600 mV) in the input threshold and in the status output values if the microprocessor ground is not common to the device ground. This shift will not vary if more than one HSD shares the same diode/resistor network. 3.2 Load dump protection Dld is necessary (Voltage Transient Suppressor) if the load dump peak voltage exceeds the VCC max DC rating. The same applies if the device is subject to transients on the VCC line that are greater than the ones shown in the ISO 7637-2: 2004(E) table. 3.3 MCU I/O protection If a ground protection network is used and negative transients are present on the VCC line, the control pins will be pulled negative. ST suggests to insert a resistor (Rprot) in line to prevent the MCU I/O pins from latching up. The value of these resistors is a compromise between the leakage current of MCU and the current required by the HSD I/Os (Input levels compatibility) with the latch-up limit of MCU I/Os: -VCCpeak/Ilatchup ≤ Rprot ≤ (VOHμC - VIH - VGND) / IIHmax Calculation example: For VCCpeak = - 100V and Ilatchup ≥ 20mA; VOHµC ≥ 4.5V 5k Ω ≤ Rprot ≤ 180kΩ Recommended values: Rprot = 10kΩ, CEXT=10nF. 3.4 Current sense and diagnostic The current sense pin performs a double function (see Figure 30: Current sense and diagnostic): • Current mirror of the load current in normal operation, delivering a current proportional to the load one according to a know ratio KX. The current ISENSE can be easily converted to a voltage VSENSE by means of an external resistor RSENSE. Linearity between IOUT and VSENSE is ensured up to 5 V minimum (see parameter VSENSE in Table 9: Current sense (8 V < VCC < 18 V)). The |
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