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PDF U2044B Data sheet ( Hoja de datos )
| Número de pieza | U2044B | |
| Descripción | DUAL OUTPUT FLASHER | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Temperature and Supply Voltage Compensated Flashing Frequency
• Frequency Doubling Indicates Lamp Outage
• Two Relay Driver Outputs with High Current-carrying Capacity and Low Saturation
Voltage
• Minimum Lamp Load for Flasher Operation: ³ 1 W
• Very Low Susceptibility to EMI
• Protection According to ISO/TR7637/1 Level 4
• Extremly Low Current Consumption < 10 µA (with Switches Open)
• Reverse Polarity Protection
• Three Control Inputs: Left, Right and Hazard Warning
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Description
The integrated circuit U2044B is used in relay-controlled automotive flashers. With two
output stages, each side of the vehicle is controlled separately. A left and a right direc-
tion indicator input with only a small control current makes switch contacts for small
loads possible.
The separate hazard warning input simplifies the construction of the hazard switch.
Lamp outage is indicated by frequency doubling during direction mode. Thanks to
extreme low current consumption the U2044B can be directly connected to the
battery.
Dual Output
Flasher
U2044B
Rev. 4721A–AUTO–05/03
1
1 page  
U2044B
Supply Voltage (Pin 9)
GND (Pin 10)
Control Output Relay 1
and 2 (Pin 11 and 13)
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Supply Voltage Power
(Pin 12)
The combination of the shunt resistor and the resistance of the wire harness prevents
pin 8 from a too high voltage in the case of shorted lamps.
This pin supplies the oscillator, the comparators and the logic parts of the IC.
The integrated circuit is protected against transients according to ISO-TR 7637-3 level 3
via resistor R2 to ground (-31). An integrated protection circuit together with external
resistors R2, R3, R4, R6, R8 and R9 limits the current pulses in the IC. The IC is also pro-
tected against reversed battery.
The relay control outputs are high-side drivers with a low saturation voltage and capable
of driving a typical automotive relay with a coil resistance of 60 W.
This pin supplies the relay drivers connected directly to the battery (Kl 30). It is internally
clamped by a 27-V Z-diode.
Absolute Maximum Ratings
Reference point pin 1
Parameters
Supply voltage, 1 min, pins 5, 9 and 12
Junction temperature
Ambient temperature range
Storage temperature range
Symbol
VS
Tj
Tamb
Tstg
Value
24
150
-40 to +100
-55 to +150
Unit
V
°C
°C
°C
Thermal Resistance
Parameters
Junction ambient, DIP14
Junction ambient, SO14
Symbol
RthJA
RthJA
Value
90
120
Unit
K/W
K/W
Electrical Characteristics
Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V.
Reference point ground (-31), Tamb = 25°C, unless otherwise specified
Parameters
Test Conditions
Symbol
Supply voltage range
Supply current, switches open
Output current for relay driver
Saturation voltage
Relay output reverse current
Relay coil resistance
Start delay
Pins 5, 9, 12
Pins 5, 9, 12
Pins 11, 13
RL = 82 W
VS = 8 V
VS = 12 V
Pin 11, 13
First bright phase
VS
IS
IO
VO
IO
RL
ton
Min.
8
60
Typ.
Max.
18
10
300
1.0
1.2
0.1
10
Unit
V
µA
mA
V
V
mA
W
ms
4721A–AUTO–05/03
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U2044B.PDF ] | |
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