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BQ33100EVM-001: use EVM with Maxwell BMOD0058 E016 B02 16V Supercap module

Jack Haller74
Prodigy 30 points
Part Number: BQ33100EVM-001
Other Parts Discussed in Thread: BQ33100

I would like to use the BQ33100EVM-001 board to monitor a Maxwell 16V Supercap Module BMOD0058 E016 B02. The Module has 6 capacitors in series with internal balancing and external taps (min capacitance is 58F @ 16v). The chip must be used in the stack mode since there is no access to the individual caps in the stack, but does the BQ33100EVM-001 board have to be modified by removing the present balancing components? 

  • 0
    TI__Mastermind 25955 points
    Hi Jack,

    The balancing cannot be achieved in stack mode.

    When using stack mode, care must be taken to ensure that the IC pins 3(VC1), 4(VC2), 5(VC3), 6(VC4), and 7(SRP) are terminated correctly. You must insure that the differential voltage between any two of the adjacent signals does not exceed 8 V. This can be implemented with a set of two or more high-value resistors, depending on the maximum stack voltage in the application.
    For example, if a 9S stack is to be used, with maximum voltage of 24 V, you can arrange a string of four 1-MΩ resistors with high side connected to pin 3(VC1) and bottom to ground. The 18-V tap would connect to pin 4(VC2) along with a 0.1-µF capacitor to ground. Similarly, the 12-V tap would connect to pin 5(VC3) and the 6-V tap to pin 6(VC4) – each with a 0.1-µF cap to ground.
    The top of the cap stack is measured by pin 3(VC1) using a 1K series resistor and 0.1-µF cap to ground from pin 3. The low side of the cap stack should be referenced to the analog ground on pin 19 of the bq33100. In stack mode, VC5 and VC5BAL pins are not used and should be connected to Vss.

    For more information please refer to: www.ti.com/.../slua751.pdf

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Prodigy 30 points
    Thank you Bryan for your reply. From your answer I am implying that the PFET balancing components on the BQ33100EVM-001 board would have to be de-soldered in order to operate in the stack mode, of course the 1meg resistors would have to be added externally.
  • 0 in reply to Jack Haller74
    TI__Mastermind 25955 points
    Hi Jack,

    Depopulating the extraneous components would work for operation in stack mode.

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Prodigy 30 points

    For 6 capacitor stack, the values of R5, R6, R7 need to be changed to R5 = 48.7K, R6 = 107K, R7 = 7.5K