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U2403B - Charge Timer

General Description

The U2403B is a monolithic, integrated-bipolar circuit which can be used in applications for time-controlled, constant-current charge.

Selection of charge current versus timing is carried out by using the external circuit at Pins 2, 3 and 4.

Key Features

  • D D D D D D D D Easy-to-run autonomous dual rate charger Constant charge current 3 h.
  • 24 h charge time programmable Low cost dc regulator Overtemperature protection Charge-mode indication Operation starts at the moment of battery insertion Fast charge time-test mode.

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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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U2403B Charge Timer Description The U2403B is a monolithic, integrated-bipolar circuit which can be used in applications for time-controlled, constant-current charge. Selection of charge current versus timing is carried out by using the external circuit at Pins 2, 3 and 4. For high current requirement, an external transistor is recommended in series with the battery. To protect the IC against high power loss (typically > 140°C), the oscillator is shut down when the reference voltage is switched off (0 V). The latter also takes place when there is a saturation caused by collector voltage at Pin 1. When the overtemperature has disappeared and the collector voltage at Pin 1 has exceeded the supply voltage (V1 > VS), charge time operation continues (see flow chart in figure 3).