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 1. Description Flasher IC with 18-mΩ Shunt U6043B 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. Rev. 4726B–AUTO–11/05 2. Block Diagram Figure 2-1. Car Flasher Application Circuit + VS + 49 6 C1 2 R3 Shunt Measuring comparator V 6 - 49 mV 4 K1 20 kΩ 18 mΩ 5 kΩ 7 K2 Pulse generator R1 3 49 a-Comparator K 2 Relay 20 kΩ 49 a-Comparator K 3 8 R2 49 a K3 1.5...2.2 kΩ 5 23 V 20 kΩ 5 kΩ IC Ground 1 R4 470 Ω 5 W 21 W 21 W GND - 31 2 21 W 21 W 5 W Indicator lamps U6043B 4726B–AUTO–11/05 U6043B 3. Pin Configuration Figure 3-1. Pinning GND 1 8 SI VS 2 7 LD REL 3 6 VS OSC 4 5 OSC U6043B Table 3-1. Pin Description Pin Symbol Function 1 GND IC ground 2 VS 3 REL Relay driver Supply voltage 4 OSC Oscillator 5 OSC Oscillator 6 VS Supply voltage, Sense 7 LD Lamp outage detection 8 SI Start input (49a) 4. Functional Description 4.1 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. 4.2 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 VS to Pin 6 is lower than that to Pin 2. 4.3 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 Ω. 3 4726B–AUTO–11/05 4.4 Pin 4 and 5, Oscillator The flashing frequency, f1, is determined by the R1C1 components as given by the following formula below (see Figure 2-1): 1 1 ≈ ------------------------------------- Hz R 1 × C 1 × 1,5 where C1 ≤47 µF, R1 = 6.8 kΩ to 510 kΩ 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) 4.5 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. 4.6 Pin 7, Lamp Outage Detection The lamp current is monitored via an external shunt resistor Rsh and an internal comparator K1 with its reference voltage of typically 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 mΩ 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. 4.7 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 kΩ, 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. 4 U6043B 4726B–AUTO–11/05 U6043B 5. Absolute Maximum Ratings Reference point Pin 1 Parameters Symbol Value Unit Pin 2 and 6 VS 16.5 V 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 50 A A mA Output current Pin 3 IO 0.3 A DIP8 SO8 DIP8 SO8 Ptot Ptot Ptot Ptot 420 340 690 560 mW mW mW mW TJ 150 °C Ambient temperature range Tamb -40 to +95 °C Storage temperature range Tstg -55 to +150 °C Symbol Value Unit RthJA RthJA 110 160 K/W K/W Supply voltage Surge Forward Current Power Dissipation Tamb = 95° C Tamb = 60° C Junction temperature 6. Thermal Resistance Parameters Junction ambient DIP8 SO8 7. Electrical Characteristics Typical values under normal operation in application circuit (see Figure 2-1), VS (+49, Pin 2 and 6) = 12 V. Reference point ground (-31), Tamb = 25°C, unless otherwise specified. Parameters Test Conditions Symbol Min. Supply voltage range Pin 2 and 6 VS 9 Dark phase, Pin 2 and 6 Bright phase, Pin 2 and 6 IS IS Supply current Typ. Max. Unit 15 V 8 11 mA mA VO IO 1.0 0.1 V mA 10 ms 4.5 7.0 Relay control output: Saturation voltage Reverse current Pin 3 IO = 150 mA, VS= 9 V Start delay (Delay time) First bright phase ton Frequency tolerance Normal flashing ∆f1 -5 +5 % Bright period Basic frequency f1 Control frequency f2 ∆f1 ∆f2 47 37 53 45 % % Frequency increase Lamp outage f2 2.15 × f1 2.3 × f1 Hz Control signal threshold VS = 15 V, Pin 7 VS = 9 V, Pin 7 VS = 12 V, Pin 7 VRs VRs VRs 50 43 47 53 45 49 57 47 51 mV mV mV Leakage resistance 49a to GND RP 4 5 kΩ Lamp load PL 1 W 5 4726B–AUTO–11/05 8. Ordering Information Extended Type Number U6043B-MY Package DIP8 Remarks Pb-free U6043B-MFPY SO8 Tubed, Pb-free U6043B-MFPG3Y SO8 Taped and reeled, Pb-free 9. Package Information 6 U6043B 4726B–AUTO–11/05 U6043B Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.8 5 technical drawings according to DIN specifications 1 4 10. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 4726B-AUTO-11/05 • Put datasheet in a new template • First page: Pb-free logo added • Page 6: Ordering Information changed 7 4726B–AUTO–11/05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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