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PGA411-Q1: VCC and VCCSW average and max. current

Jon Bilbao
Intellectual 1415 points
Part Number: PGA411-Q1

Hi guys,

can you let me know the Average and max current on VCC and VCCSW on the PGA411-Q1?

Regards,

Jon

  • 0
    TI__Mastermind 27780 points
    The appropriate Applications Engineer has been assigned to respond accordingly. Thank you for your patience.
  • 0
    TI__Mastermind 23810 points
    Jon,

    I will look up the data we have for VCC, but I will need to test the VCCSW current experimentally based on your customer's conditions.

    The current through VCCSW will depend on the resolver sensor load, exciter output amplitude, and the VEXT boost voltage. What peak output current, voltage output peak-to-peak, and boost voltage setting will be used for this application?

    Thanks,

    -Clancy
  • 0 in reply to Clancy Soehren
    Prodigy 10 points

    Hi,

    thank you for the fast replay.

    For the first design it is enough, if you could tell me the worst case currents.

    Thanks,

    Matthias

  • 0 in reply to Matthias Hochmeister
    TI__Mastermind 23810 points
    Matthias,

    We can accommodate that. One of my colleagues, Bobby, is taking lab measurements for this question today. He will respond with his data tomorrow.

    Thanks,

    -Clancy
  • 0 in reply to Matthias Hochmeister
    TI__Mastermind 49110 points

    Data taken from PGA411EVM:

    4Vrms Boost voltage set to 12V (standard)

    Load resistance 43 ohms               Load:101.480 mArms                     DC offset: 2V                     Gain:1.9

    Supply Current: 294 mA

    Load resistance 75 ohms               Load: 59.943 mArms                      DC offset: 2V                     Gain: 1.9

    Supply Current: 193 mA

    7Vrms Boost voltage set to 15V (standard)

    Load resistance: 74 Ohms             Load: 102.158 mArms                    DC offset:2V                      Gain:1.9

    Supply Current: 366 mA

    Load resistance 132 ohms             Load: 60.196 mArms                       DC offset: 2V                     Gain: 1.9

    Supply Current: 235 mA

    For the 4Vrms setting, the boosted voltage selected was 12V which is expected for standard operation. The boosted voltage is 15V for the 7Vrms setting and was chosen for the same reason. The DC offset and Gain were chosen to be at the maximum setting to show worst case scenario on the supply current draw.

    The max load current was chosen to be 145 mApeak (or about 102.53 mArms) due to the maximum allowed output current specified by the datasheet. A reference point of 85mApeak (or about 60.1mArms) was used to show the difference on the supply current draw.

    Conclusion:

    From the data above, it can be seen the maximum supply current draw occurs at 7Vrms with a boosted voltage of 15V. Supply Current at this setting is 366mA.

    Side note:

    The supply current can be minimized by adjusting the boosted voltage; this boosted voltage controls the headroom of the output and should be chosen to avoid the output from clipping. Therefore to minimize the supply current draw, the minimal voltage allowable to avoid clipping should be used.

    The DC offset behaves the same way but affects the foot room of the output (should be chosen to to be lowest possible to avoid clipping and minimize supply current draw). This parameter does not affect the supply current AS MUCH as the boost voltage setting.