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U644B-FP

Part Number	U644B-FP
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	U644B-FP PDF File

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 Pulse generator 49 a Comparator K 2 20 kW 8 Relay R3 3.
3 kW 30 V 1 GND R2 220 W GND –31 49 a 5 K3 49 a Comparator K 3 20 kW 13 kW 12707 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 TELEFUNKEN Semiconductors Rev.
A2, 25-Feb-97 1 (6) U644B +V S +49 2 Measuring comparator K 1 V S – 49 mV 4 K1 6 C1 R4 Shunt 20 kW 20 k 7 2 kW 3 18 mW K2 R1 Pulse generator 49 a Comparator K 2 20 kW 8 Relay R3 3.
3 kW 30 V 1 GND R2 220 W GND –31 49 a 5 K3 49 a Comparator K 3 20 kW 13 kW 12708 Figure 2.
Application circuit as a car flasher without control input Resistor R1, R2 and R3: 1/4 Watt R2 for protection against continuous reversed polarity: 1 Watt Application Note In figure 1, the control input (Pin 6) is used to enable or disable U644B.
If the ignition is switched off, the current consumption is less than 50 mA.
In figure 2, Pin 6 is bridged to Pin 2, so U644B works li...

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U644B-FP Flasher/ 18-m Shunt/ Extremly Low Current Consumption - TEMIC Semiconductors

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