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VND5E050MCKTR-E Datasheet(PDF) 23 Page - STMicroelectronics

Part # VND5E050MCKTR-E
Description  Double-channel high-side driver with analog current sense for automotive applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VND5E050MCKTR-E Datasheet(HTML) 23 Page - STMicroelectronics

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VND5E050MCJ-E, VND5E050MCK-E
Application information
Doc ID 022514 Rev 2
23/40
This resistor can be shared amongst several different HSDs. Please note that the value of
this resistor should be calculated with formula (1) where IS(on)max becomes the sum of the
maximum on-state currents of the different devices.
Please note that if the microprocessor ground is not shared by the device ground then the
RGND produces a shift (IS(on)max * RGND) in the input thresholds and the status output
values. This shift varies depending on how many devices are on in case of several high-side
drivers sharing the same RGND.
If the calculated power dissipation leads to a large resistor or several devices have to share
the same resistor then ST suggests to utilize Solution 2 (see Section 3.1.2).
3.1.2
Solution 2: diode (DGND) in the ground line
A resistor (RGND = 1 k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 produces 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 not varies if more than one HSD share 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 maximum 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/Os protection
If a ground protection network is used and negative transients are present on the VCC line,
the control pins are pulled negative.
ST suggests to insert a resistor (Rprot) in line to prevent the microcontroller I/O pins from
latching-up.
The value of these resistors is a compromise between the leakage current of microcontroller
and the current required by the HSD I/Os (Input levels compatibility) with the latch-up limit of
microcontroller I/Os:
Equation 2
-VCCpeak / Ilatchup  Rprot  (VOHC - VIH - VGND) / IIHmax
Calculation example:
For VCCpeak = - 100 V, Ilatchup  20 mA and VOHµC  4.5 V
5 k
  R
prot  180 k
Recommended values: Rprot =10 k, CEXT = 10 nF.


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