Maker : TEMIC Semiconductors
Part No. : U2044B-FP

  Datasheet PDF : U2044B-FP.pdf
  Cross Reference : U2044B-FP Cross Reference
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Product Information

U2044B Dual Output Flasher Description The integrated circuit U2044B is used in relay controlled automotive flashers. With two output stages each side of the vehicle is controlled separately. A left and a right direction indicator input with only a small control current makes switch contacts for small loads possible. The separate hazard warning input simplifies the construction of the hazard switch. Lamp outage is indicated by frequency doubling during direction mode. Thanks to the extreme low current consumption U2044B can be connected to the battery directly. Features D Temperature and supply voltage compensated flashing frequency D Frequency doubling indicates lamp outage D Two relay driver outputs with high current-carrying capacity and low saturation voltage D Very low susceptibility to EMI D Protection according to ISO/TR7637/1 level 4 D Extremly low current consumption < 10 mA (@switches open) D Minimum lamp load for flasher operation: w1 W Package DIP14 SO14 D Reverse polarity protection D Three control inputs: left, right and hazard warning Ordering Information Extended Type Number U2044B U2044B-FP Remarks Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol OSC SIL SIR SIHW VS CR1 CR2 LD VS GND OR1 VS OR2 OSC Function Oscillator Start input left Start input right Start input hazard warning VS Control input relay 1 Control input relay 2 Lamp failure detection VS IC ground Output relay 1 VS Output relay 2 Oscillator OSC SIL SIR SIHW VS CR1 CR2 1 2 3 4 5 6 7 14 OSC 13 OR2 12 Vs U2044B 11 OR1 10 GND 9 8 VS LD 12750 Figure 1. Pinning TELEFUNKEN Semiconductors Rev. A1, 25-Feb-97 1 (6) U2044B Block Diagram 9 5 + – K1 Contact 1 14 R1 82 kW 1 + – VRef1 + – + – – + VS–6 V 27.5 V 11 13 GND 10 R2 220 W Relay 1 2 3 2 4 R3 4.7 kW R6 4.7 kW R10 1.2 kW – + 12 VRef2 VS /2 6 R9 47 kW 7 R8 47 kW 2 VS–81 mV RShunt 30 mW 30 30 C1 4.7 mF 8 30 Hazard warning R4 4.7 kW right 15 R5 1.2 kW R7 1.2 kW left 31 12700 Figure 2. Application circuit R2 for protection against continous reversed polarity: 1 Watt Functional Description Pin 1 and Pin 14, Oscillator Flashing frequency, f1, is determined by the R1C1 components as follows (see figure 2): f1 Pin 2 and Pin 3, Start input right and left Flashing is disabled as long as the input comparator is tied zu GND (pull-down resistor R7 or R5). The high side flasher switch ”left” or ”right” changes the comparator status and enables the output stage at Pin 11 or Pin 13. R6 and R4 are protection resistors for the input stage. With an open flasher switch the current consumption is only I 10 mA. The IC kept in stand-by mode until there is a voltage drop of V 6.9 V at the pull-down resistor. Direction mode can only be activated when the ignition switch is in ON-position as shown in figure 2. Pin 4, Start input hazard warnig In contrast to the direction switches, the hazard input is [ R1 1 C1 C1 R1 1.5 Hz where  47 mF + 6.8 kW to 510 kW In the case of a lamp outage the oscillator frequency is switched to the lamp outage frequency f2 with f2 2.2 f1. t [ [ Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode (bright phase): 40% 2 (6) TELEFUNKEN Semiconductors Rev. A1, 25-Feb-97 U2044B a low-side type. The pull-up resistor R10 provides the offstate. R3 is a protection resistor for the input stage. Hazard warning can be activated independent of the ignition switch position. Pin 5, Supply voltage sense This pin supplies the lamp outage comparator at Pin 8 and is externally connected to the battery (Kl 30). Pin 6 and 7, Control input relay 1 and 2 The feedback detects the bright phase and the dark phase and enables the oscillator. Pin 8, Lamp outage detection The lamp current is monitored via an external shunt resistor, RShunt and an internal comparator K1 with its reference voltage of typ. 81 mV (VS = 12 V). The outage of one lamp out of two lamps is detected according to the following calculation: Nominal current of 1 lamp...

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