U6043B

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 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-mΩ Shunt U6043B 4726C–AUTO–02/10 2. Block Diagram Figure 2-1. Car Flasher Application Circuit C1 4 6 Measuring comparator V 6 - 49 mV 20 kΩ K1 2 5 kΩ 7 R3 Shunt 18 mΩ + VS + 49 K2 Pulse R1 generator 49 a-Comparator K 2 20 kΩ 49 a-Comparator K 3 K3 5 20 kΩ 3 Relay 8 R2 23 V 5 kΩ IC Ground 1 1.5...2.2 kΩ R4 470 Ω 49 a 5W GND - 31 21 W 21 W 21 W Indicator lamps 21 W 5 W 2 U6043B 4726C–AUTO–02/10 3. Pin Configuration Figure 3-1. Pinning GND 1 8 SI VS 2 REL 3 U6043B 7 LD 6 VS OSC 4 5 OSC Table 3-1. Pin 1 2 3 4 5 6 7 8 Pin Description Symbol Function GND IC ground VS Supply voltage REL Relay driver OSC Oscillator OSC Oscillator VS Supply voltage, Sense LD Lamp outage detection SI Start input (49a) U6043B 4726C–AUTO–02/10 3 4. Functional Description 4.1 Pin 1, GND The U6043B is protected against damage in case of battery reversal via resistor R4 to ground (–3...