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BQ76952: Secondary protection option.

somya agar
Prodigy 110 points
Part Number: BQ76952

I want to know the recommended fuse part number  for secondary protection option with BQ76952. whether fuse could be directly controlled by FUSE pin of BQ76952 or not as shown in screenshot below

Please suggest.

  • 0
    TI__Guru 54715 points

    Hi Somya,

    The fuse part number will vary with the manufacturer you select and the cell voltages.  Contact your supplier for information.  The fuse pin typically activates a low side FET to provide current for the fuse activation.  See the BQ76952 data sheet figure 12-1 for a concept.  Schematics such as data sheet figure 16-3 or the EVM show a FET driving an LED as an indication of fuse activation since they don't contain a fuse.  Be sure to select a FET which will support the current needed for the fuse activation.

  • 0 in reply to WM5295
    Prodigy 110 points

    Hello TI team,

    Thanks for your response.

    As shown in screenshot above F1 is a fuse, so want to know that when Fuse pin of BQ76952 is at logic 1 then Q12 turns ON i.e. fuse blows whether pin 1 of fuse will be shortened up to pin 2.

  • 0 in reply to somya agar
    TI__Guru 54715 points

    Hi Somya,

    Your image was lost in the post.  In the image below from page 43 of the BQ76952EVM user guide, if the BQ76952 sets the FUSE pin high Q12 turns on and if F1 were installed current would be drawn through pin 2 of the fuse from either the battery at pin 1 or the charger at pin 3 if the FETs are on.  With sufficient voltage and current the fuse will open.  Check with your fuse supplier for characteristics.  The part number shown on the schematic for representation is a Dexerials number.  That item may not be appropriate for your specific application.