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U644B-FP Datasheet(PDF) 1 Page - TEMIC Semiconductors |
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U644B-FP Datasheet(HTML) 1 Page - TEMIC Semiconductors |
1 / 6 page U644B TELEFUNKEN Semiconductors Rev. A2, 25-Feb-97 1 (6) Flasher, 18-m W Shunt, Extremly Low Current Consumption Description The bipolar integrated circuit, U644B, is used in relay- controlled automotive flashers where a high level EMC is required. Lamp outage is indicated by frequency doub- ling during hazard warning as well as direction mode. If the flasher module provides an 4-pin connector the control pin of U644B (Pin 6) can be used to operate the IC in an extremly low-current mode. Features D Frequency doubling indicates lamp outage D Frequency independent of temperature and voltage change 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 TR7637/1 level 4 D Control input (Kl 15) Ordering Information Extended Type Number Package Remarks U644B DIP8 U644B-FP SO8 Block Diagram V S –49 mV Pulse generator GND 20 k W 3.3 k W Relay 7 15 49 a 4 5 K 2 K 1 K 3 C 1 R 1 2 12707 R 3 49 a Comparator K 2 49 a Comparator K 3 2 k W 20 k W 20 k W 20 k W 13 k W 30 V 6 3 8 1 Shunt R 4 GND –31 R 5 10 k W 30 18 m W Measuring comparator K 1 220 W R 2 Figure 1. Application circuit as a car flasher with control input Resistor R1, R2 and R3: 1/4 Watt R2 for protection against continuous reversed polarity: 1 Watt |
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