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VND5E050ACKTR-E Datasheet(PDF) 25 Page - STMicroelectronics

Part # VND5E050ACKTR-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

VND5E050ACKTR-E Datasheet(HTML) 25 Page - STMicroelectronics

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VND5E050ACJ-E, VND5E050ACK-E
Application information
Doc ID 022515 Rev 2
25/43
If the calculated power dissipation leads to a large resistor or several devices have to share
the same resistor then ST suggests to utilize Section 3.1.2: Solution 2: diode (DGND) in the
ground line.
3.1.2
Solution 2: diode (DGND) in the ground line
A resistor (RGND =1 kΩ) 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 (
≈600mV) 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 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:
-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 33: Current sense and
diagnostic):
Current mirror of the load current in normal operation, delivering a current
proportional to the load current according to a known 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 5V
minimum (see parameter VSENSE in Table 9: Current sense (8 V < VCC <18 V)). The
current sense accuracy depends on the output current (refer to current sense electrical


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