TEMIC U2043B

U2043B
Flasher, 30-mW Shunt, Pilot Lamp to GND or VBatt
Description
The integrated circuit U2043B is used in relay controlled
automotive flashers where a high EMC level is required.
A lamp outage is indicated by frequency doubling during
hazard mode as well as direction mode. Pilot lamp can be
connected either to VBatt or GND.
Features
D Temperature and voltage compensated frequency
D Warning indication of lamp failure by means of
frequency doubling
D Minimum lamp load for flasher operation
w 10 W
D Relay output with high current carrying capacity and
low saturation voltage
D Low susceptibility to EMI
Ordering Information
Extended Type Number
U2043B
U2043B–FP
Package
DIP8
SO8
Remarks
Block Diagram
+ VS
+ 49
6
2
R3
Shunt
C1
Measuring comparator
4
K 1 V 6–81 mV
30 m W
7
Pilot lamp
3
Pulse
generator
R1
Relay
3.8 k W
R2
8
5
5W
3.3 k W
K 3 V –5 V
6
49 a–Comparator
49 a
23 V
1
IC Ground
R1
100
13283
W
GND
– 31
5 W 21 W 21 W
21 W 21 W 5 W
Indicator lamps
Pilot lamps
Figure 1.
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
1 (6)
U2043B
Pin Description
Pin
1
2
3
4
5
6
7
8
Symbol
GND
VS
REL
OSC
OSC
VS
LD
SI
Function
IC ground
Supply voltage VS
Relay driver
C1 oscillator
R1 oscillator
Supply voltage VS
Lamp failure detection
Start input (49a)
GND
1
8
SI
Vs
2
7
LD
U2043B
REL
3
6
Vs
OSC
4
5
OSC
12749
Figure 2. Pinning
Functional Description
Pin 1, GND
The integrated circuit is protected against damage via
resistor R4 to ground (–31) in the case of battery reversal.
An integrated protection circuit together with external
resistances R2 and R4 limits the current pulses in the IC.
Pin 2, Supply voltage, VS - Power
The arrangement of the supply connections to Pin 2 must
be such as ensure that, on the connection printed circuit
board (PCB), the resistance of VS to Pin 6 is lower than
that to Pin 2.
Pin 3, Relay control output (driver)
The relay control output is a high-side driver with a low
saturation voltage and capable to drive a typical automotive relay with a minimum coil resistance of 60 W.
Pin 4 and 5 Oscillator
Flashing frequency, f1, is determined by the R1C1 components as follows (see figure 1):
[ R C1 1.5 Hz
C 47 mF
R + 6.8 kW to 510 kW
f1
1
where
1
1
1
In the case of a lamp outage (see Pin 7) the oscillator
frequency is switched to the lamp outage frequency f2
with f2 2.2 f1.
[
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode: 40% (bright phase)
Pin 6, Supply voltage, Sense
For accurate monitoring via the shunt resistor, a mini-
2 (6)
mized layer resistance from point VS / shunt to Pin 6 is
recommended.
Pin 7, Lamp outage detection
The lamp current is monitored via an external shunt
resistor R3 and an internal comparator K1 with its
reference voltage of typ. 81 mV (VS = 12 V). The outage
of one lamp out of two lamps is detected according to the
following calculation:
Nominal current of 1 lamp: 21 W / (VS = 12 V):
Ilamp = 1.75 A
Nominal current of 2 lamps: 2 x 21 W / (VS = 12 V):
Ilamp = 3.5 A.
The detection threshold is recommended to be set in the
middle of the current range: Ioutage 2.7 A
Thus the shunt resistor is calculated as:
R3 = VT (K1) / Ioutage
R3 = 81 mV/2.7 A = 30 mW.
Comparator K1‘s reference voltage is matched to the
characteristics of filament lamps (see “control signal
threshold” in the data part).
The combination of shunt resistor and resistance of wire
harness prevents Pin 7 from a too high voltage in the case
of shortet lamps.
[
Pin 8, Start input
Start condition for flashing: the voltage at Pin 8 has to be
below less than VS – 5 V (flasher switch closed).
Humidity and dirt may decrease the resistance between
49 a and GND. If this leakage resistance is 5 kW the IC
is still kept in its off-condition. In this case the voltage at
Pin 8 is greater than VS – 5 V.
During the bright phase the voltage at Pin 8 is above the
K2 threshold, during the dark phase it is below the K3
threshold. For proper start conditions a minimum lamp
wattage of 10 W is required.
u
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
U2043B
Absolute Maximum Ratings
Reference point Pin 1
Parameters
Supply voltage
Surge forward current
tp = 0.1 ms
tp = 2 ms
tp = 2 ms
Output current
Power dissipation
Tamb = 95°C
Tamb = 60°C
Pins 2, 6
Symbol
VS
Value
16.5
Unit
V
Pins 2, 6
Pins 2, 6
Pin 8
Pin 3
IFSM
IFSM
IFSM
IO
1.5
1.0
50
0.3
A
A
mA
A
DIP8
SO8
DIP8
SO8
Ptot
Ptot
Ptot
Ptot
Tj
Tamb
Tstg
420
340
690
560
150
–40 to +95
–55 to +150
mW
mW
mW
mW
°C
°C
°C
Symbol
RthJA
RthJA
Value
110
160
Unit
K/W
K/W
Junction temperature
Ambient temperature range
Storage temperature range
Thermal Resistance
Parameters
Junction ambient
DIP8
SO8
Electrical Characteristics
Typical values under normal operation in application circuit figure 1, VS (+49, Pins 2 and 6) = 12 V.
Reference point ground (–31), Tamb = 25°C, unless otherwise specified
Parameters
Supply voltage range
Supply current
Supply current
Relay output
Relay output
reverse current
Relay coil resistance
Start delay
Frequency determining
resistor
Frequency determining
capacitor
Test Conditions / Pins
Pins 2, 6
Dark phase or
stand-by
Pins 2, 6
Bright phase
Pins 2, 6
Saturation voltage
IO = 150 mA,
Pin 3
VS = 9 V
Pin 3
First bright phase
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
Symbol
VS(+49)
IS
Min.
Typ.
9 to 15
4.5
Max.
8
Unit
V
mA
7.0
11
mA
VO
1.0
V
IO
0.1
mA
10
510
ms
kW
47
mF
IS
RL
ton
R1
C1
W
60
6.8
3 (6)
U2043B
Electrical Characteristics (continued)
Parameters
Frequency tolerance
Bright period
Bright period
Frequency increase
Control signal threshold
Leakage resistance
Lamp load
4 (6)
Test Conditions / Pins
Normal flashing, basisc frequency f1 not including the
tolerance of the external
components R1 and C1
Basic frequency f1
Control frequency f2
Lamp outage
VS = 15 V
Pin 7
VS = 9 V
VS = 12 V
49a to GND
Symbol
Min.
Df1
Df1
Df2
f2
VR3
VR3
VR3
Rp
PL
Max.
Unit
–5
+5
%
47
37
2.15 f1
85
66
76
53
45
2.3 f1
97
76
87
5
%
%
Hz
mV
mV
mV
kW
W
10
Typ.
91
71
81
2
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
U2043B
Package Information
Package DIP8
Dimensions in mm
7.77
7.47
9.8
9.5
1.64
1.44
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
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
1.4
0.25
0.10
0.4
1.27
6.15
5.85
3.81
8
0.2
3.8
5
technical drawings
according to DIN
specifications
13034
8
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
5
5 (6)
U2043B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic 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.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division 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.
TEMIC 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 TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC 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.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
6 (6)
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97