DESCRIPTION
The bipolar integrated circuit Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode. FEATURES
D Temperature and supply voltage compensated flashing frequency D Frequency doubling indicates lamp outage D Relay driver output with high current carrying capacity and low saturation voltage D Minimum lamp load for flasher operation: ≥ 1 W D Very low susceptibility to EMI D Protection according to ISO/TR 7637/1 level 4 Block Diagram + VS + 49 6 C1 4 Measuring comparator K 1 V6–81 mV 20 kW K1 2 R3 Shunt 5 kW 7 30 mW K2 R1 Pulse generator 3 49 a–Comparator K2 20 kW 49 a–Comparator K3 K3 23 V 20 kW 5 kW IC Ground 1 95 9756 Relay 8 R2 49 a 1.5...2.2 kW 5 R4 470 W 5 W 21 W 21 W 21 W 21 W 5 W Indicator lamps GND – 31 Figure 1. Application circuit as a car flasher, Resistor R1 and R2: 1/4 Watt R4 for protection against continuous reversed polarity: 0.5 Watt Ordering Information Extended Type Number U643B U643B-FP Package DIP8 SO8 Remarks Rev. A3,...
Atmel
