The VN20N is a monolithic device made using
SGS-THOMSONVerticalIntelligentPower
Technology, intended for driving resistive or
inductive loads with one side grounded.
Built-in thermal shut-down protects the chip from
over temperature and short circuit.
The input control is 5V logic level compatible.
The open drain diagnostic output indicates open
(*) The VIHis internally cl am ped at 6V about . It is possible to connect this pin to an higher vol t age v ia an external resistor
cal culated to not exceed 10 mA at the input pin.
(•) Status deter m ination > 100 µ s after the switching edge.
Switc h-off Time in
Short Circuit Condition
at Start-Up
Ove r CurrentR
Aver age Current in
Short Circuit
Open Load Cu r rent
Level
Thermal Shut-down
Tem perature
Reset Temper ature125
R
=10mA
STAT
I
=-10mA
STAT
R
<10mΩTc=25oC25ms
LOAD
<10mΩ-40 ≤ Tc≤ 125oC140A
LOAD
R
<10mΩTc=85oC2.5A
LOAD
5700mA
140
6
-0.7
V
V
o
C
o
C
FUNCTIONAL DESCRIPTION
The device has a diagnostic output which
indicates opencircuit (no load) andover
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 140oC. When the
temperature returns to about 125oC 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 -VFis seen by the device. (VIL,V
thresholds and V
are increased by VFwith
STAT
respect to power GND).
IH
– 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 in fig. 4), which becomes
the common signal GND for the whole control
board.
In this way no shift of VIH,VILand V
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.
STAT
takes
4/11
Page 5
TRUTH TABLE
INPUTOUTPUTDIAG NO ST IC
Normal O perationL
H
Open Circuit (No Load)HHL
Ove r -temperatureHLL
Under-v oltageXLH
L
H
Figure 1: Waveforms
VN20N
H
H
Figure 2: Over Current Test Circuit
5/11
Page 6
VN20N
Figure 3: Typical Application Circuit With A Schottky Diode For Reverse Supply Protection
Figure 4: Typical Application Circuit With Separate Signal Ground
6/11
Page 7
VN20N
R
DS(on)
R
DS(on)
vs Junction TemperatureR
vs Supply Voltage
DS(on)
vs Output CurrentInput voltages vs Junction Temperature
Output Current DeratingOpen Load vs Junction Temperature
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which mayresults from its use. No
license is grantedby implication or otherwise under anypatent or patent rights of SGS-THOMSON Microelectronics.Specificationsmentioned
in this publicationare subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproductsarenot authorizedforuse as criticalcomponents inlife supportdevices or systemswithout express
written approval of SGS-THOMSON Microelectonics.
1994SGS-THOMSON Microelectronics- All RightsReserved
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland -Taiwan - Thailand - United Kingdom - U.S.A
SGS-THOMSON Microelectronics GROUP OF COMPANIES
11/11
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