VNQ500 STMicroelectronics, VNQ500 Datasheet - Page 15

• Manufacturer Part Number: VNQ500
• Description: Quad Channel High-side Driver
• Manufacturer: STMicroelectronics

VNQ500
3.1.2
3.2
3.3
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.
Solution 2: a diode (D
Note that a resistor (R
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.
Load dump protection
D
V
line that are greater than those shown in the ISO T/R 7637/1 table.
MCU I/O protection
If a ground protection network is used and negative transients are present on the V
the control pins will be pulled negative. ST suggests to insert a resistor (R
prevent the μC I/O pins from latching up.
The value of these resistors is a compromise between the leakage current of
current required by the HSD I/Os (Input levels compatibility) with the latch-up limit of
I/Os:
Example
For the following conditions:
Recommended values are:
CC
ld
is necessary (Voltage Transient Suppressor) if the load dump peak voltage exceeds the
maximum DC rating. The same applies if the device is subject to transients on the V
-V
V
I
V
5kΩ ≤ R
R
latchup
CCpeak
OHμC
prot
CCpeak
=10kΩ
≥ 20mA
≥ 4.5V
= - 100V
prot
/I
latchup
≤ 180kΩ.
≤ R
GND
prot
=1kΩ) should be inserted in parallel to D
GND
≤ (V
Doc ID 9934 Rev 3
OHμC
) in the ground line
-V
IH
-V
GND
) / I
IHmax
≈
Application information
GND
if the device drives
prot
) in line to
µ
C and the
CC
µ
C
line,
15/24
CC