Page 1
U2043B
TELEFUNKEN Semiconductors
Rev . A2, 25-Feb-97
1 (6)
Flasher, 30-mW Shunt, Pilot Lamp to GND or V
Batt
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 V
Batt
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 Package Remarks
U2043B DIP8
U2043B–FP SO8
Block Diagram
V6–81 mV
23 V
Pulse
generator
IC Ground
3.8 k
W
3.3 k
W
Relay
7
3
8
+ V
S
+ 49
R
3
100
W
R
1
49 a
4
5
K
1
K
3
C
1
R
1
6
2
13283
49 a–Comparator
21 W 21 W 5 W21 W21 W5 W
GND
– 31
R
2
Indicator lamps
Measuring comparator
Shunt
30 m
W
V6–5 V
1
Pilot lamp 5 W
Pilot lamps
Figure 1.
Page 2
U2043B
TELEFUNKEN Semiconductors
Rev . A2, 25-Feb-97
2 (6)
Pin Description
Pin Symbol Function
1 GND IC ground
2 V
S
Supply voltage V
S
3 REL Relay driver
4 OSC C1 oscillator
5 OSC R1 oscillator
6 V
S
Supply voltage V
S
7 LD Lamp failure detection
8 SI Start input (49a)
1
2
3
4
8
7
6
5
GND
Vs
REL
OSC
OSC
Vs
LD
12749
SI
U2043B
Figure 2. Pinning
Functional Description
Pin 1, GND
The integrated circuit is protected against damage via
resistor R
4
to ground (–31) in the case of battery reversal.
An integrated protection circuit together with external
resistances R
2
and R
4
limits the current pulses in the IC.
Pin 2, Supply voltage, V
S
- 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 V
S
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 , f
1
, is determined by the R1C1 compo-
nents as follows (see figure 1):
f
1
[
1
R1
C1
1.5
Hz
where C
1
47
m
F
R
1
+ 6.8 kW to 510 k
W
In the case of a lamp outage (see Pin 7) the oscillator
frequency is switched to the lamp outage frequency f
2
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-
mized layer resistance from point V
S
/ shunt to Pin 6 is
recommended.
Pin 7, Lamp outage detection
The lamp current is monitored via an external shunt
resistor R
3
and an internal comparator K1 with its
reference voltage of typ. 81 mV (V
S
= 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 / (V
S
= 12 V):
I
lamp
= 1.75 A
Nominal current of 2 lamps: 2 x 21 W / (V
S
= 12 V):
I
lamp
= 3.5 A.
The detection threshold is recommended to be set in the
middle of the current range: I
outage
[ 2.7 A
Thus the shunt resistor is calculated as:
R
3
= VT (K1) / I
outage
R
3
= 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 V
S
– 5 V (flasher switch closed).
Humidity and dirt may decrease the resistance between
49 a and GND. If this leakage resistance is u 5 kW the IC
is still kept in its off-condition. In this case the voltage at
Pin 8 is greater than V
S
– 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.
Page 3
U2043B
TELEFUNKEN Semiconductors
Rev . A2, 25-Feb-97
3 (6)
Absolute Maximum Ratings
Reference point Pin 1
Parameters Symbol Value Unit
Supply voltage Pins 2, 6 V
S
16.5 V
Surge forward current
t
p
= 0.1 ms Pins 2, 6
t
p
= 2 ms Pins 2, 6
t
p
= 2 ms Pin 8
I
FSM
I
FSM
I
FSM
1.5
1.0
50
A
A
mA
Output current Pin 3 I
O
0.3 A
Power dissipation
T
amb
= 95°C DIP8
SO8
P
tot
P
tot
420
340
mW
mW
T
amb
= 60°C DIP8
SO8
P
tot
P
tot
690
560
mW
mW
Junction temperature T
j
150 °C
Ambient temperature range T
amb
–40 to +95 °C
Storage temperature range T
stg
–55 to +150 °C
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient DIP8
SO8
R
thJA
R
thJA
110
160
K/W
K/W
Electrical Characteristics
Typical values under normal operation in application circuit figure 1, VS (+49, Pins 2 and 6) = 12 V.
Reference point ground (–31), T
amb
= 25°C, unless otherwise specified
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Supply voltage range Pins 2, 6 VS(+49) 9 to 15 V
Supply current Dark phase or
stand-by Pins 2, 6
I
S
4.5 8 mA
Supply current Bright phase Pins 2, 6 I
S
7.0 11 mA
Relay output Saturation voltage
I
O
= 150 mA,
V
S
= 9 V Pin 3
V
O
1.0 V
Relay output
reverse current
Pin 3 I
O
0.1 mA
Relay coil resistance R
L
60
W
Start delay First bright phase t
on
10 ms
Frequency determining
resistor
R
1
6.8 510 k
W
Frequency determining
capacitor
C
1
47
m
F
Page 4
U2043B
TELEFUNKEN Semiconductors
Rev . A2, 25-Feb-97
4 (6)
Electrical Characteristics (continued)
Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Frequency tolerance Normal flashing, basisc fre-
quency f
1
not including the
tolerance of the external
components R
1
and C
1
D
f
1
–5 +5 %
Bright period Basic frequency f
1
D
f
1
47 53 %
Bright period Control frequency f
2
D
f
2
37 45 %
Frequency increase Lamp outage f
2
2.15 f
1
2.3 f
1
Hz
Control signal threshold VS = 15 V Pin 7
V
S
= 9 V
V
S
= 12 V
V
R3
V
R3
V
R3
85
66
76
91
71
81
97
76
87
mV
mV
mV
Leakage resistance 49a to GND R
p
2 5 k
W
Lamp load P
L
10 W
Page 5
U2043B
TELEFUNKEN Semiconductors
Rev . A2, 25-Feb-97
5 (6)
Package Information
13021
9.8
9.5
Package DIP8
Dimensions in mm
1.64
1.44
4.8 max
0.5 min
3.3
0.58
0.48
7.62
2.54
6.4 max
0.36 max
9.8
8.2
7.77
7.47
85
14
technical drawings
according to DIN
specifications
13034
technical drawings
according to DIN
specifications
Package SO8
Dimensions in mm
5.00
4.85
0.4
1.27
3.81
1.4
0.25
0.10
5.2
4.8
3.7
3.8
6.15
5.85
0.2
85
85
Page 6
U2043B
TELEFUNKEN Semiconductors
Rev . A2, 25-Feb-97
6 (6)
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
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