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U2044B

TEMIC Semiconductors
Part Number U2044B
Manufacturer TEMIC Semiconductors
Description Dual Output Flasher
Published Apr 16, 2005
Detailed Description U2044B Dual Output Flasher Description The integrated circuit U2044B is used in relay controlled automotive flashers. Wi...
Datasheet PDF File U2044B PDF File

U2044B
U2044B

Overview
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 fo...


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