U2044B TEMIC Semiconductors, U2044B Datasheet - Page 2

• Manufacturer Part Number: U2044B
• Description: Dual Output Flasher
• Manufacturer: TEMIC Semiconductors

Block Diagram
Functional Description
Pin 1 and Pin 14, Oscillator
Flashing frequency, f
components as follows (see figure 2):
where
In the case of a lamp outage the oscillator frequency is
switched to the lamp outage frequency f
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode (bright phase): 40%
U2044B
2 (6)
f
4.7
1
R
82 k
C
1
[
1
m
F
W
f
R
2
1
14
V
1
[
S
–6 V
2.2
C
R
C
1
1
1
1

+
f
47
1
6.8 k
.
1.5
1
m
, is determined by the R
F
W
Hz
to 510 k
11
+
R
–
Relay
1
2
for protection against continous reversed polarity: 1 Watt
13
W
2
220
2
GND 10
with
R
W
2
27.5 V
Figure 2. Application circuit
Hazard warning
1
K1
C
4.7 k
1.2 k
1
+
+
+
+
–
–
–
–
R
R
W
W
4
5
Pin 2 and Pin 3, Start input right and left
Flashing is disabled as long as the input comparator is tied
zu GND (pull-down resistor R
flasher switch ”left” or ”right” changes the comparator
status and enables the output stage at Pin 11 or Pin 13. R
and R
With an open flasher switch the current consumption is
only I
is a voltage drop of V
Direction mode can only be activated when the ignition
switch is in ON-position as shown in figure 2.
Pin 4, Start input hazard warnig
In contrast to the direction switches, the hazard input is
3
V
V
Ref1
Ref2
2
V
R
4.7 k
R
1.2 k
4
t
6
7
S
–81 mV
are protection resistors for the input stage.
4
W
W
R
10
4.7 k
3
m
+
–
W
A. The IC kept in stand-by mode until there
V
S
/2
12
9
5
8
6
7
[
TELEFUNKEN Semiconductors
right
left
6.9 V at the pull-down resistor.
1.2 k
R
10
47 k
47 k
W
R
R
9
8
W
W
7
or R
1
Rev. A1, 25-Feb-97
Contact
5
30 m
R
). The high side
Shunt
W
2
12700
30
30
30
15
31
6