VND810 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
VND810 Datasheet PDF : 19 Pages
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VND810
APPLICATION SCHEMATIC
+5V +5V
+5V
Rprot
STATUS1
µC
Rprot
Rprot
INPUT1
STATUS2
VCC
Dld
OUTPUT1
Rprot
INPUT2
GND
OUTPUT2
VGND
RGND
DGND
GND PROTECTION NETWORK AGAINST
REVERSE BATTERY
Solution 1: Resistor in the ground line (RGND only). This
can be used with any type of load.
The following is an indication on how to dimension the
RGND resistor.
1) RGND ≤ 600mV / IS(on)max.
2) RGND ≥ (−VCC) / (-IGND)
where -IGND is the DC reverse ground pin current and can
be found in the absolute maximum rating section of the
device’s datasheet.
Power Dissipation in RGND (when VCC<0: during reverse
battery situations) is:
PD= (-VCC)2/RGND
This resistor can be shared amongst several different
HSD. 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
common with the device ground then the RGND will
produce a shift (IS(on)max * RGND) in the input thresholds
and the status output 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 leads to a large resistor
or several devices have to share the same resistor then
the ST suggests to utilize Solution 2 (see below).
Solution 2: A diode (DGND) in the ground line.
A resistor (RGND=1kΩ) should be inserted in parallel to
DGND if the device will be driving an inductive load.
This small signal diode can be safely shared amongst
several different HSD. Also in this case, the presence of
the ground network will produce a shift (j600mV) in the
input threshold and the status output values if the
microprocessor ground is not common with the device
ground. This shift will not vary if more than one HSD
shares the same diode/resistor network.
LOAD DUMP PROTECTION
Dld is necessary (Voltage Transient Suppressor) if the
load dump peak voltage exceeds VCC max DC rating. The
same applies if the device will be subject to transients on
the VCC line that are greater than the ones shown in the
ISO T/R 7637/1 table.
8/19
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