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U644B

TEMIC Semiconductors
Part Number U644B
Manufacturer TEMIC Semiconductors
Description Flasher/ 18-m Shunt/ Extremly Low Current Consumption
Published Apr 16, 2005
Detailed Description U644B Flasher, 18-mW Shunt, Extremly Low Current Consumption Description The bipolar integrated circuit, U644B, is used ...
Datasheet PDF File U644B PDF File

U644B
U644B

Overview
U644B Flasher, 18-mW Shunt, Extremly Low Current Consumption Description The bipolar integrated circuit, U644B, is used in relaycontrolled automotive flashers where a high level EMC is required.
Lamp outage is indicated by frequency doubling 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 Minimum lamp load for flasher operation: D Very low susceptibility to EMI 1 W D Relay driver output with high current-carrying capacity and low saturation voltage D Protection according to ISO TR7637/1 level 4 D Control input (Kl 15) Ordering Information Extended Type Number U644B U644B-FP Package DIP8 SO8 Remarks Block Diagram R5 10 kW 30 2 Measuring comparator K 1 V S – 49 mV 4 K1 6 15 C1 R4 Shunt 20 kW 20 kW 7 2 kW 3 18 mW K2 R1 Pul...


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