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U643B - Flasher IC

General Description

The bipolar integrated circuit U643B is used in relay-controlled automotive flashers where a high-level EMC is required.

Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode.

Rev.

AUTO

2.

Figure 2-1.

Key Features

  • Temperature and Supply Voltage Compensated Flashing Frequency.
  • Frequency Doubling Indicates Lamp Outage.
  • Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage.
  • Minimum Lamp Load for Flasher Operation: ≥ 1W.
  • Very Low Susceptibility to EMI.
  • Protection According to ISO/TR 7637/1 Level 4 Flasher IC with 30-mΩ Shunt 1.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Features • Temperature and Supply Voltage Compensated Flashing Frequency • Frequency Doubling Indicates Lamp Outage • Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage • Minimum Lamp Load for Flasher Operation: ≥ 1W • Very Low Susceptibility to EMI • Protection According to ISO/TR 7637/1 Level 4 Flasher IC with 30-mΩ Shunt 1. Description The bipolar integrated circuit U643B is used in relay-controlled automotive flashers where a high-level EMC is required. Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode. U643B Rev. 4727B–AUTO–09/05 2. Block Diagram Figure 2-1. Car Flasher Application Circuit, Resistor R1 and R2: 0.25W; R4 for Protection Against Continuous Reversed Polarity: 0.