vnd920p STMicroelectronics, vnd920p Datasheet - Page 10

• Manufacturer Part Number: vnd920p
• Description: Double Channel High Side Solid State Relay
• Manufacturer: STMicroelectronics

APPLICATION SCHEMATIC
GND
REVERSE BATTERY
Solution 1: Resistor in the ground line (R
can be used with any type of load.
The following is an indication on how to dimension the
R
where -I
be found in the absolute maximum rating section of the
device’s datasheet.
Power Dissipation in R
battery situations) is:
P
This resistor can be shared amongst several different
HSD. Please note that the value of this resistor should be
calculated with formula (1) where I
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 R
produce a shift (I
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 R
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 (D
A resistor (R
D
VND920P
10/18
D
GND
GND
1) R
2) R
= (-V
resistor.
GND
GND
if the device will be driving an inductive load.
+5V
CC
GND
C
PROTECTION
)
2
/R
600mV / (I
is the DC reverse ground pin current and can
GND
R
GND
V
SENSE1,2
CC
R
R
R
R
=1k
S(on)max
prot
prot
prot
prot
) / (-I
GND
GND
S(on)max
GND
should be inserted in parallel to
* R
) in the ground line.
)
(when V
NETWORK
GND
).
) in the input thresholds
S(on)max
CC
<0: during reverse
C. SENSE 2
C. SENSE 1
INPUT2
INPUT1
GND
becomes the
GND
AGAINST
only). This
.
GND
will
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 (
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.
Series resistor in INPUT and STATUS lines are also
required to prevent that, during battery voltage transient,
the current exceeds the Absolute Maximum Rating.
Safest configuration for unused INPUT and STATUS pin
is to leave them unconnected.
LOAD DUMP PROTECTION
D
load dump peak voltage exceeds V
same applies if the device will be subject to transients on
the V
ISO T/R 7637/1 table.
If a ground protection network is used and negative
transients are present on the V
be pulled negative. ST suggests to insert a resistor (R
in line to prevent the C I/Os pins to latch-up.
The value of these resistors is a compromise between the
leakage current of C and the current required by the
HSD I/Os (Input levels compatibility) with the latch-up limit
of C I/Os.
Calculation example:
For V
5k
Recommended R
C I/Os PROTECTION:
ld
-V
V
GND1
GND
is necessary (Voltage Transient Suppressor) if the
CCpeak
CC
CCpeak
R
prot
line that are greater than the ones shown in the
R
/I
GND
latchup
= - 100V and I
V
CC1
65k .
GND2
prot
R
OUTPUT1
OUTPUT2
value is 10k
V
D
prot
CC2
GND
latchup
(V
OH C
CC
line, the control pins will
-V
CC
20mA; V
IH
max DC rating. The
-V
GND
j
600mV) in the
OH C
) / I
IHmax
D
4.5V
ld
prot
)