U2043B Datasheet | TEMIC Semiconductors

Description The integrated circuit U2043B is used in relay controlled automotive flashers where a high EMC level is required. A lamp outage is indicated by frequency doubling during hazard mode as well as direction mode. Pilot lamp can be connected either to VBatt or GND. Features D Temperature and voltage pensated frequency D Warning indication of lamp failure by means of frequency doubling D Relay output with high current carrying capacity and low saturation voltage D Minimum lamp load for flasher operation w 10 W Package DIP8 SO8 D Low susceptibility to EMI Ordering Information Extended Type Number U2043B U2043B- FP Remarks Block Diagram + VS + 49 6 C1 Measuring parator 4 K 1 V 6- 81 m V 7 Pilot lamp Pulse generator 3.8 k W 8 K 3 V - 5 V 6 49 a- parator 23 V 1 IC Ground 2 R3 Shunt 30 m W 5W R1 3 Relay R2 3.3 k W 49 a R1 100 - 31 5 W 21 W 21 W 21 W 21 W 5 W Indicator lamps Pilot lamps Figure 1. TELEFUNKEN Semiconductors Rev. A2, 25-Feb-97 1 (6) 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 VS Relay driver C1 oscillator R1 oscillator Supply voltage VS Lamp failure detection Start input (49a) GND Vs REL OSC 1 2 8 7 SI LD Vs OSC 3 4 6 5 Figure 2. Pinning Functional Description Pin 1, GND The integrated circuit is protected against damage via resistor R4 to ground (- 31) in the case of battery reversal. An integrated protection circuit together with external resistances R2 and R4 limits the current pulses in the IC. Pin 2, Supply voltage, VS - Power The arrangement of the supply connections to Pin 2 must be such as ensure that, on the connection printed circuit board (PCB), the resistance of VS 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 and capable to drive a typical automotive relay with a minimum coil resistance of 60 W. Pin 4 and 5 Oscillator...