U6043B ATMEL | Alldatasheet
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Technical content
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: /g179 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 do ubling during hazard warning as well as direction mode. Flasher IC with 18-m/g87 Shunt U6043B
2 U6043B
Figure 1. Car Flasher Application Circuit
21 W 21 W 5 W21 W21 W5 W
Figure 2. Pinning
1 GND IC ground
2 VS Supply voltage
3 REL Relay driver
6 VS Supply voltage, Sense
7 LD Lamp outage detection
8 SI Start input (49a)
4 U6043B
4726A–AUTO–06/03 Functional Description Pin 1, GND The U6043B is protected against damage in case of battery reversal via resistor R 4 to ground (-31). An integrated protection circuit together with external resistances R 2 and R4 limits the current pulses in the IC. Pin 2, Supply Voltage, VS power 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 V S to Pin 6 is lower than that to Pin 2. Pin 3, Relay Control Output (Driver) 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 /g87. Pin 4 and 5, Oscillator The flashing frequency, f 1, is determined by the R 1C1 components as given by the fol- lowing formula below (see Figure 1): where C1 /g163 47 µF, R1 = 6.8 k/g87 to 510 k/g87 In case of a lamp outage (see Pin 7) the oscillator frequency is switched to the lamp out- age frequency f2 with f2 /g187/g322.2 /g180 f1. Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode: 40% (bright phase) Pin 6, Supply Voltage, Sense For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt to Pin 6 is recommended. Pin 7, Lamp Outage Detection The lamp current is monitored via an external shunt resistor Rsh and an internal compar- ator K1 with its reference voltage of typ. 49 mV (V S = 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 /g180 21 W/(VS = 12 V): Ilamp = 3.5 A We recommend setting the detection threshold in the middle of the current range: Ioutage /g187 2.7 A Thus, the shunt resistor is calculated as: Rsh = VT (K1)/Ioutage Rsh = 49 mV/2.7 A = 18 m/g87 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.
4726A–AUTO–06/03 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 k /g87, 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 Symbol Value Unit Supply voltage Pin 2 and 6 V S 16.5 V Surge Forward Current tP = 0.1 ms tP = 300 ms tP = 300 ms Pin 2 and 6 Pin 2 and 6 Pin 8 IFSM IFSM IFSM 1.5 1.0 A A mA Output current Pin 3 I O 0.3 A Power Dissipation T amb = 95/g176C Tamb = 60/g176C DIP 8 SO8 DIP 8 SO8 P tot Ptot Ptot Ptot 420 340 690 560 mW mW mW mW Junction temperature T J 150 /g176C Ambient temperature range T amb -40 to +95 /g176C Storage temperature range T stg -55 to +150 /g176C Thermal Resistance Parameters Symbol Value Unit Junction ambient DIP8 SO8 RthJA RthJA 110 160 K/W K/W
6 U6043B
4726A–AUTO–06/03
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 = 25°C, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit Supply voltage range Pin 2 and 6 VS 9 15 V Supply current Dark phase, Pin 2 and 6 Bright phase, Pin 2 and 6 IS IS 4.5 7.0 mA mA Relay control output: Saturation voltage Reverse current Pin 3 I O = 150 mA, VS= 9 V VO IO 1.0 0.1 V mA Start delay (Delay time) First bright phase ton 10 ms Frequency tolerance Normal flashing /g68f1 -5 +5 % Bright period Basic frequency f1 Control frequency f2 /g68f1 /g68f2 Frequency increase Lamp outage f2 2.15 /g180 f1 2.3 /g180 f1 Hz Control signal threshold VS = 15 V, Pin 7 VS = 9 V, Pin 7 VS = 12 V, Pin 7 VRs VRs VRs mV mV mV Leakage resistance 49a to GND RP 4 5 k/g87 Lamp load PL 1 W
4726A–AUTO–06/03
Package Information
Ordering Information
Extended Type Number Package Remarks U6043B DIP8 – U6043B-FP SO8 –
8 U6043B
4726A–AUTO–06/03 SO8 technical drawings according to DIN specifications Dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2
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