U2044B 데이터 시트보기 (PDF) - Atmel Corporation
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U2044B Datasheet PDF : 6 Pages
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U2044B
Block Diagram
C1
4.7 mF
14
+
–
R1
82 kW
1
9
5
+
–
VS–81 mV
8
K1
30
RShunt
30
30 mW
Contact
1
2
6
VRef1
+
–
7
+
–
–
+
VRef2
VS /2
R9
47 kW
R8
47 kW
VS–6 V
–
+
27.5 V
12
11
13 GND 10
324
30
R2
220 W
Hazard warning
R3
4.7 kW
R10
1.2 kW
Relay
R4
R6
12
4.7 kW
4.7 kW
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
1
C1
1.5 Hz
where
C1 47 mF
R1 + 6.8 kW to 180 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
to 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
only I t 10 mA. The IC is kept in stand-by mode until
there is a voltage drop of V [ 6.9 V at the pull-down re-
sistor.
Direction mode can only be activated when the ignition
switch is in ON-position as shown in figure 2.
2 (6)
Rev. A4, 03-Apr-01
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