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U2043B
WFlasher, 30-m 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
wD Minimum lamp load for flasher operation 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
C1
4
6
Measuring comparator
K1 V6–81 mV
2
7
WR3 30 m
Shunt
+ VS
+ 49
Pilot lamp 5 W
Pulse
R1 generator
3.8 k W
5 K3 V6–5 V
49 a–Comparator
3
Relay
8 R2
3.3 k W
23 V
1 R1
IC Ground
100 W
13283
GND
– 31
Figure 1.
49 a
5 W 21 W 21 W 21 W 21 W 5 W
Indicator lamps
Pilot lamps
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
1 (6)

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U2043B
Pin Description
Pin Symbol
Function
1 GND IC ground
2 VS Supply voltage VS
3 REL Relay driver
4 OSC C1 oscillator
5 OSC R1 oscillator
6 VS Supply voltage VS
7 LD Lamp failure detection
8 SI Start input (49a)
GND 1
8 SI
Vs 2
REL 3
7 LD
U2043B
6 Vs
OSC 4
5 OSC
Figure 2. Pinning
12749
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 automo-
Wtive relay with a minimum coil resistance of 60 .
Pin 4 and 5 Oscillator
Flashing frequency, f1, is determined by the R1C1 compo-
nents as follows (see figure 1):
where
[f1
R1
1
C1
1.5 Hz
C1
+R1
47 mF
6.8 kW to 510 kW
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-
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:
WR3 = VT (K1) / Ioutage
R3 = 81 mV/2.7 A = 30 m .
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).
u WHumidity and dirt may decrease the resistance between
49 a and GND. If this leakage resistance is 5 k 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.
2 (6) TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97

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Absolute Maximum Ratings
Reference point Pin 1
Parameters
Supply voltage
Pins 2, 6
Surge forward current
tp = 0.1 ms
tp = 2 ms
tp = 2 ms
Output current
Pins 2, 6
Pins 2, 6
Pin 8
Pin 3
Power dissipation
Tamb = 95°C
DIP8
SO8
Tamb = 60°C
DIP8
SO8
Junction temperature
Ambient temperature range
Storage temperature range
U2043B
Symbol
VS
IFSM
IFSM
IFSM
IO
Ptot
Ptot
Ptot
Ptot
Tj
Tamb
Tstg
Value
16.5
1.5
1.0
50
0.3
420
340
690
560
150
–40 to +95
–55 to +150
Unit
V
A
A
mA
A
mW
mW
mW
mW
°C
°C
°C
Thermal Resistance
Junction ambient
Parameters
DIP8
SO8
Symbol
RthJA
RthJA
Value
110
160
Unit
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), 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,
VS = 9 V
Pin 3
Pin 3
First bright phase
Symbol
VS(+49)
IS
IS
VO
IO
RL
ton
R1
C1
Min.
60
6.8
Typ.
9 to 15
4.5
7.0
Max.
8
11
1.0
0.1
10
510
47
Unit
V
mA
mA
V
mA
W
ms
kW
mF
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
3 (6)