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Features
* * * * * *
Temperature and Supply Voltage Compensated Flashing Frequency Frequency Doubling Indicates Lamp Outage Relay Driver Output 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/TR 7637/1 Level 4
Description
The bipolar integrated circuit U6043B is used in relay-controlled automotive flashers where a high level EMC is required. Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode.
Flasher IC with 18-mW Shunt U6043B
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1
Block Diagram
Figure 1. Car Flasher Application Circuit
+ VS + 49 6 C1 4 K1 Measuring comparator V 6 - 49 mV 20 kW 5 kW 7 2 R3 Shunt 18 mW
K2 R1 Pulse generator 3 49 a-Comparator K 49 a-Comparator K K3 5 20 kW 23 V 5 kW IC Ground 1 R4 470 W 5 W 21 W 21 W GND - 31 21 W 21 W 5 W
2
Relay 8 R2 49 a 1.5...2.2 kW
20 kW
3
Indicator lamps
2
U6043B
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U6043B
Pin Configuration
Figure 2. Pinning
GND 1 2 8 7 SI
VS REL OSC
LD VS OSC
U6043B
3 4 6 5
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND VS REL OSC OSC VS LD SI Function IC ground Supply voltage Relay driver Oscillator Oscillator Supply voltage, Sense Lamp outage detection Start input (49a)
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Functional Description
Pin 1, GND
The U6043B is protected against damage in case of battery reversal via resistor R4 to ground (-31). An integrated protection circuit together with external resistances R2 and R4 limits the current pulses in the IC. The arrangement of the supply connections to Pin 2 (and 6) must be so as to ensure that on the connection printed circuit board (PCB), the resistance of VS to Pin 6 is lower than that to Pin 2. The relay control output is a high-side driver with a low saturation voltage. It is capable of driving a typical automotive relay with a minimum coil resistance of 60 W. The flashing frequency, f1, is determined by the R1C1 components as given by the following formula below (see Figure 1):
1 f 1 ---------------------------------- Hz R 1 C 1 1.5
Pin 2, Supply Voltage, VS power Pin 3, Relay Control Output (Driver) Pin 4 and 5, Oscillator
where C1 47 F, R1 = 6.8 kW to 510 kW In case of a lamp outage (see Pin 7) 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: 40% (bright phase)
Pin 6, Supply Voltage, Sense Pin 7, Lamp Outage Detection
For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt to Pin 6 is recommended. The lamp current is monitored via an external shunt resistor Rsh and an internal comparator K1 with its reference voltage of typ. 49 mV (VS = 12 V). The outage of one lamp is detected according to the following calculation: Nominal current of 1 lamp: 21 W/(VS = 12 V): Ilamp = 1.75 A Nominal current of 2 lamps: 2 21 W/(VS = 12 V): Ilamp = 3.5 A We recommend setting the detection threshold in the middle of the current range: Ioutage 2.7 A Thus, the shunt resistor is calculated as: Rsh = VT (K1)/Ioutage Rsh = 49 mV/2.7 A = 18 mW Comparator K1's reference voltage is matched to the characteristics of filament lamps (see "Control Signal Threshold" in the data part). The combination of shunt resistor and resistance of wire harness prevents Pin 7 from a too high voltage in case of shorted lamps.
4
U6043B
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U6043B
Pin 8, Start Input
Start condition for flashing: the voltage at Pin 8 has to be below the K3 threshold (flasher switch closed). Humidity and dirt may decrease the resistance between 49 a and GND. If this leakage resistance is > 5 kW, the IC is still kept in the off-condition. In this case the voltage at Pin 8 is between the thresholds of comparators K2 and K3. During the bright phase the voltage at Pin 8 is above the K2 threshold, during the dark phase it is below the K3 threshold. For proper start conditions a minimum lamp wattage of 1 W is required.
Absolute Maximum Ratings
Reference point Pin 1
Parameters Supply voltage Surge Forward Current tP = 0.1 ms tP = 300 ms tP = 300 ms Output current Power Dissipation Tamb = 95C Tamb = 60C Junction temperature Ambient temperature range Storage temperature range DIP 8 SO8 DIP 8 SO8 Ptot Ptot Ptot Ptot TJ Tamb Tstg 420 340 690 560 150 -40 to +95 -55 to +150 mW mW mW mW C C C Pin 2 and 6 Pin 2 and 6 Pin 8 Pin 3 IFSM IFSM IFSM IO 1.5 1.0 50 0.3 A A mA A Pin 2 and 6 Symbol VS Value 16.5 Unit V
Thermal Resistance
Parameters Junction ambient DIP8 SO8 Symbol RthJA RthJA Value 110 160 Unit K/W K/W
5
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Electrical Characteristics
Typical values under normal operation in application circuit (see Figure 1), VS (+49, Pin 2 and 6) = 12 V. Reference point ground (-31), Tamb = 25C, unless otherwise specified.
Parameters Supply voltage range Supply current Relay control output: Saturation voltage Reverse current Start delay (Delay time) Frequency tolerance Bright period Frequency increase Control signal threshold Leakage resistance Lamp load Test Conditions Pin 2 and 6 Dark phase, Pin 2 and 6 Bright phase, Pin 2 and 6 Pin 3 IO = 150 mA, VS= 9 V First bright phase Normal flashing Basic frequency f1 Control frequency f2 Lamp outage VS = 15 V, Pin 7 VS = 9 V, Pin 7 VS = 12 V, Pin 7 49a to GND Symbol VS IS IS VO IO ton Df1 Df1 Df2 f2 VRs VRs VRs RP PL 1 -5 47 37 2.15 f1 50 43 47 53 45 49 4 Min. 9 4.5 7.0 Typ. Max. 15 8 11 1.0 0.1 10 +5 53 45 2.3 f1 57 47 51 5 Unit V mA mA V mA ms % % % Hz mV mV mV kW W
6
U6043B
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U6043B
Ordering Information
Extended Type Number U6043B U6043B-FP Package DIP8 SO8 Remarks - -
Package Information
DIP8
7
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SO8
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7
technical drawings according to DIN specifications
1
4
8
U6043B
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4726A-AUTO-06/03 xM

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