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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: 1 W Very Low Susceptibility to EMI Protection According to ISO/TR7637/1 Level 4 Extremly Low Current Consumption < 10 A (with Switches Open) Reverse Polarity Protection Three Control Inputs: Left, Right and Hazard Warning
Dual Output Flasher U2044B
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 direction 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.
Rev. 4721A-AUTO-05/03
1
Figure 1. Block Diagram
30
9 5 RShunt C1 4.7 F K1 Contact 1 14 R1 82 k W 1 + 7 + + V S-6 V 27.5 V 11 13 GND R2 220 W Hazard warning R4 4.7 k W R6 4.7 k W right 10 3 2 4 R3 4.7 k W R10 1.2 k W + 12 V Ref2 V S /2 + V Ref1 6 R9 47 k W R8 47 k W 2 + V S-81 mV 8 30 m W
30
30
Relay 1 2
15 left 31
12700
R5 1.2 k W
R7 1.2 k W
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Pin Configuration
Figure 2. Pinning DIP14/SO14
OSC 1 SIL 2 SIR 3 14 OSC 13 OR2 12 VS
SIHW 4 VS 5
U2044B
11 OR1 10 GND 9 8 VS LD
CR1 6 CR2 7
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol OSC SIL SIR SIHW VS CR1 CR2 LD VS GND OR1 VS OR2 OSC
Function
Oscillator Start input left Start input right Start input hazard warning VS Control input relay 1 Control input relay 2 Lamp failure detection VS IC ground Output relay 1 VS Output relay 2 Oscillator
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Functional Description
Oscillator (Pin 1 and 14)
Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1): 1 f 1 ---------------------------------- Hz R 1 C 1 1.5 where C1 47 F 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: Duty cycle in lamp outage mode: 50% 40% (bright phase)
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 (Pin 2 and 3)
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 < 10 A. The IC is 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 the ON-position as shown in Figure 1.
Start Input Hazard Warning (Pin 4) Supply Voltage Sense (Pin 5) Control Input Relay 1 and 2 (Pin 6 and 7) Lamp Outage Detection (Pin 8)
In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R10 provides the off-state. R3 is a protection resistor for the input stage. Hazard warning can be activated independent of the ignition switch position. This pin supplies the lamp outage comparator at pin 8 and is externally connected to the battery (Kl 30). The feedback detects the bright phase and the dark phase and enables the oscillator.
The lamp current is monitored via an external shunt resistor, RShunt and an internal comparator, K1, with its reference voltage of typically 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): Nominal current of 2 lamps: 2 21 W / (VS = 12 V): Ilamp = 1.75 A Ilamp = 3.5 A
We recommend setting the detection threshhold in the middle of the current range: Ioutage 2.7 A Thus the shunt resistor is calculated as: RShunt = VT (K1)/Ioutage RShunt = 81 mV/2.7 A = 30 mW Comparator K1's reference voltage is matched to the characteristics of filament lamps (see section "Control Signal Threshold").
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U2044B
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.
Supply Voltage (Pin 9) GND (Pin 10)
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 protected 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.
Control Output Relay 1 and 2 (Pin 11 and 13) Supply Voltage Power (Pin 12)
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 = 25C, unless otherwise specified Parameters Supply voltage range Supply current, switches open Output current for relay driver Saturation voltage Relay output reverse current Relay coil resistance Start delay First bright phase Test Conditions Pins 5, 9, 12 Pins 5, 9, 12 Pins 11, 13 RL = 82 W VS = 8 V VS = 12 V Pin 11, 13 Symbol VS IS IO Min. 8 Typ. Max. 18 10 300 Unit V A mA
VO
IO RL ton 60
1.0 1.2
0.1 10
V V
mA W ms
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Electrical Characteristics (Continued)
Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V. Reference point ground (-31), Tamb = 25C, unless otherwise specified Parameters Control signal threshold Test Conditions VS = 9 V VS = 13.5 V VS = 16 V VS = 9 V to 16 V, pin 8, Tamb = -140C to 100C VS = 13.5 V, pin 8 Tamb = -40C to 100C Tamb = -40C to 100C TK Symbol VS VS VS -6 10 Min. Typ. 70.6 85.0 93.0 +6 Max. Unit mV mV mV % V/K
Tolerance of control signal threshold Temperature coefficient of control signal threshold Clamping voltage Relay output overvoltage detection (relay disabled)
V12 V12
25.0
18
27.5 20
30.0
22
V
V
Tolerances
Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V. Reference point ground (-31), Tamb = 25C, unless otherwise specified Parameters Frequency determining resistor Frequency determining capacitor Frequency tolerance Normal flashing, basic frequency f1 not including the tolerance of the external components R1 and C1 Basic frequency f1 Control frequency f2 Lamp failure Test Conditions Symbol R1 C1 Min. 6.8 Typ. Max. 510 47 Unit kW F
Df1
Df1 Df2 f2 PL
-5
47 37 2.15 f1 1
+5
53 45 2.3 f1
%
% % Hz W
Bright period Frequency increase Lamp load
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Ordering Information
Extended Type Number U2044B U2044B-FP Package DIP14 SO14 Remarks - -
Package Information
Package DIP14
Dimensions in mm
20.0 max 7.77 7.47
4.8 max 6.4 max 0.5 min 3.3 0.36 max 1.64 1.44 0.58 0.48 15.24 14 8 2.54 9.8 8.2
technical drawings according to DIN specifications
1
7
5.2 4.8 8.75 3.7
Package SO14
Dimensions in mm
1.4 0.4 1.27 7.62 14 8 0.25 0.10 0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
7
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4721A-AUTO-05/03 xM

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