ETC U4790B

U4790B
Automotive Lamp-Outage Monitor, VT = 8 mV, VZ(3,5) = 22V
Description
The bipolar IC U4790B is designed as a monitor for lamp
failure in automobiles. The comparator threshold is
matched to the PTC characteristic of incandescent lamps.
The threshold is tied to a typical value of V4,6 = VS – VT
where VT = 8 mV.
If the voltage drop across shunt resistor, Rsh, exceeds
8 mV, the output is turned off, otherwise the output is
turned on. Without supply voltage or open input Pin 8, the
output is turned off. An unused comparator input must be
connected to Pin 7.
Features
10 kV–ESD protection
NPN output
Two comparators with common reference
Interference and damage–protection
according to VDE 0839
Tight threshold tolerance
EMI protection
Threshold matched to PTC characteristic
of incandescent lamps
Reversal polarity protection
Temperature compensated
Load-dump protection
Block Diagram
VBatt
VS
2
Rsh
7
Z2
5 OUT1
–
+
4
Rsh
&
Z5
0.6 VS
–
+
8
–
+
3 OUT2
&
6
Z3
1
95 10606
Lamps
R1
150 Figure 1. Schematic and application circuit
Ordering Information
Extended Type Number
Package
U4790B
DIP8
Rev. A3, 09-Apr-01
Remarks
1 (5)
U4790B
Pin Description
GND
1
8
Input
switch
VS
2
7
VRef
OUT2
3
6
IN2
IN1
4
5
OUT1
95 10634
Figure 2. Pinning
Pin
Symbol
Function
1
GND
2
VS
3
OUT2
4
IN1
5
OUT1
6
IN2
Input 2
7
VRef
Reference voltage
8
Input
Input switch
Reference point, ground
Supply voltage
Output 2
Input 1
Output 1
Absolute Maximum Ratings
Parameters
Symbol
Value
Unit
Supply voltage
Pin 2, 7
VS
16.5
V
Current consumption
t = 2 ms, measured at Pin 1 (GND)
Pin 1
I1
1.5
A
Output current
Pin 3, 5
I3,5
20
mA
Input voltage
reference point Pin 7
Pin 4, 6
–V4,6
6
V
Ptot
420
mW
Ptot
690
mW
Ambient temperature range
Tamb
–40 to +95
°C
Storage temperature range
Tstg
–55 to +125
°C
Tj
150
°C
Symbol
Value
Unit
RthJA
110
K/W
Power dissipation
Tamb = 95 °C
Tamb = 60 °C
DIP 8
DIP 8
Junction temperature
Thermal Resistance
Parameters
Junction ambient
2 (5)
DIP8
Rev. A3, 09-Apr-01
U4790B
Electrical Characteristics
VS = 9 to 15 V, Tamb = –40 to +95 °C, figure 1, unless otherwise specified
Parameters
Test Conditions / Pin
Symbol
Min
Supply voltage
Pin 2,7
VS
9
Internal Z diode Z2
Pin 2
VZ
20
Current consumption
VS = 12 V
Pin 1
measured at Pin 1 (GND)
I1
Output saturation voltage
VS = 9 V, I3,5 = 10 mA
Tamb = 25 °C
Pin 3,5
Vsat
Output Z diodes Z3, Z5
Pin 3,5
VZ
21
–VT
6.5
7.8
Control signal threshold
Voltage drift
Reference point Pin 7 (V7)
I3,5 = 3 mA
Pin 4,6
VS = 12 V
VS = 15 V
V VT(15V) VT(12V)
15 V 12V
Threshold voltage
4.5
V
6
mA
0.5
V
V
8
9.3
9.5
10.8
mV
mV/V
V8
0.6 VS
V
II
100
nA
5
A
td(on)
6
s
td(off)
30
s
Pin 3,5
Switch-off
Low to high
15
V
Pin 8
Switch-on
High to low
Unit
0.45
Pin 4,6
,
Delay time
Max
V
Pin 4,6
Switch identification Pin 8
Input
p currents
Typ
95 10624
V4,6
12.00
11.95
V
td(off)
td(on)
V0
12
6
V
0
10
20
30
40
60 s
50
t
Figure 3.
Rev. A3, 09-Apr-01
3 (5)
U4790B
Package Information
Package DIP8
Dimensions in mm
9.8
9.5
1.64
1.44
7.77
7.47
4.8 max
6.4 max
0.5 min
0.58
0.48
3.3
0.36 max
9.8
8.2
2.54
7.62
8
5
technical drawings
according to DIN
specifications
13021
1
4 (5)
4
Rev. A3, 09-Apr-01
U4790B
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It is the policy of Atmel Germany GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these
substances.
Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed
in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances
and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended
or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,
costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death
associated with such unintended or unauthorized use.
Data sheets can also be retrieved from the Internet:
http://www.atmel–wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A3, 09-Apr-01
5 (5)