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Design Notes

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  Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer &mdash DN539
  PDF, 182 Кб, Файл опубликован: 14 апр 2015
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  Determine Balancing Current for the LTC3305 Lead-Acid
  Battery Balancer
  Design Note 539
  Jim Drew
  Introduction
  The LTC В®3305 is a lead-acid battery balancer that uses
  an auxiliary battery or an alternative storage cell (AUX)
  to transfer charge to and from individual batteries within
  a series-connected stack. The balancer controls external
  NMOS switches to sequentially connect the auxiliary
  battery to each battery in the stack. To prevent damage
  to the NMOS switches and their interconnecting PCB
  traces, a current limiting device is required. One such
  device is a ceramic positive temperature coefficient
  (PTC) thermistor.
  The PTC thermistor limits the peak current in the
  connection between the AUX cell and the battery. For
  relatively small differential voltages (VDIFF ) between
  the AUX cell and the battery that is connected, the
  current through the PTC remains low, as does its
  temperature, and the PTC exhibits the characteristics
  of a constant value resistor. As VDIFF increases, current
  increases, and the temperature of the PTC rises. When …

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• Power Management > Battery Management > Battery Cell Balancers