VN05NSP Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
VN05NSP Datasheet PDF : 9 Pages
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VN05NSP
ELECTRICAL CHARACTERISTICS (continued)
PROTECTION AND DIAGNOSTICS (continued)
Symb ol
P a ram et er
Test Conditions
Min. Typ . Max. Un it
VSCL (•)
tSC
IOV
IAV
Status Clamp Voltage
Switch-off T ime in
Short Circuit Condition
at Start-Up
Over Current
Average Current in
Short Circuit
ISTAT = 10 mA
ISTAT = -10 mA
RLOAD < 10 mΩ
RLOAD < 10 mΩ
RLOAD < 10 mΩ
Tc = 25 oC
-40 Tc 125 oC
Tc = 85 oC
6
V
-0.7
V
1.5
5
ms
60
A
1.4
A
IOL
Open Load Current
Level
5
180 mA
TTSD
Thermal Shut-down
Temperature
140
oC
TR
Reset Temperature
125
oC
(*) The VIH is internally clamped at 6V about. It is possible to connect this pin to an higher voltage via an external resistor calculated to not
exceed 10 mA at the input pin.
(•) Status determination > 100 µs after the switching edge.
FUNCTIONAL DESCRIPTION
The device has a diagnostic output which
indicates open circuit (no load) and over
temperature conditions. The output signals are
processed by internal logic.
To protect the device against short circuit and
over-current condition, the thermal protection
turns the integrated Power MOS off at a minimum
junction temperature of 140 oC. When the
temperature returns to about 125 oC the switch is
automatically turned on again.
In short circuit conditions the protection reacts
with virtually no delay, the sensor being located in
the region of the die where the heat is generated.
PROTECTING THE DEVICE AGAINST
REVERSE BATTERY
The simplest way to protect the device against a
continuous reverse battery voltage (-26V) is to
insert a Schottky diode between pin 1 (GND) and
ground, as shown in the typical application circuit
(fig. 3).
The consequences of the voltage drop across
this diode are as follows:
- If the input is pulled to power GND, a negative
voltage of -VF is seen by the device. (VIL, VIH
thresholds and VSTAT are increased by VF with
respect to power GND).
The undervoltage shutdown level is increased by
VF.
If there is no need for the control unit to handle
external analog signals referred to the power
GND, the best approach is to connect the
reference potential of the control unit to node [1]
(see application circuit infig. 4), which becomes
the common signal GND for the whole control
board.
In this way no shift of VIH, VIL and VSTAT takes
place and no negative voltage appears on the
INPUT pin; this solution allows the use of a
standard diode, with a breakdown voltage able to
handle any ISO normalized negative pulses that
occours in the automotive environment.
4/9
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