U2044B Datasheet, PDF (2/6 Pages) TEMIC Semiconductors – Dual Output Flasher

U2044B
Block Diagram
m^C1
4.7 F
14
+
–
R₁
82 kW
1
9
5
+
–
V_S–81 mV
8
K1
30
W ^RShunt
30 m
30
Contact
1
2
6
V_Ref1
+
–
7
+
–
–
+
V_Ref2
V_S /2
R₉
47 kW
R₈
47 kW
V_S–6 V
–
+
27.5 V
12
11
13 GND 10
324
30
W^R2
220
Hazard warning
W ^R3
4.7 k
W ^R10
1.2 k
Relay
12
W^R4
4.7 k
W ^R6
4.7 k
right
15
R₅
R₇
left
1.2 kW
1.2 kW
31
12700
Figure 2. Application circuit
R₂ for protection against continous reversed polarity: 1 Watt
Functional Description
Pin 1 and Pin 14, Oscillator
Flashing frequency, f₁, is determined by the R₁C₁
components as follows (see figure 2):
[f₁
R₁
where
1
C₁
1.5 ^Hz
 C₁
+ R₁
467.8m_{kFW to 510 kW}
In the case of a lamp outage 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 (bright phase): 40%
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 R₇ or R₅). The high side
flasher switch ”left” or ”right” changes the comparator
status and enables the output stage at Pin 11 or Pin 13. R₆
and R₄ are protection resistors for the input stage.
With an open flasher switch the current consumption is
t m only I 10 A. The IC kept in stand-by mode until there
[ is a voltage drop of V 6.9 V at the pull-down resistor.
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
2 (6)
TELEFUNKEN Semiconductors
Rev. A1, 25-Feb-97