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TPA3110D2-Q1: current

Jin-Suk Choi
Intellectual 2290 points
Part Number: TPA3110D2-Q1
Other Parts Discussed in Thread: TPA3110D2

Hi~

Customer trying to evaluate TPA3110D2 and they want to measure power stage return current.

Based on block diagram, there are 4 PGND path from both L and R channels.

In pin description, there are two PGND pins at #19, #24 pins and they want to add opamp with shunt resistor to measure current.

Would you please check which pin(#19 or #24) is left and which is right PGND pins?

Do you think this is right way to measure load current?

If there is any other idea, please, let me know.

Thanks.

  • 0
    TI__Expert 4080 points
    Hi Jin-Suk,

    What is your customer trying to accomplish with these measurements?

    I would recommend taking a different approach to measuring the return current due to the fact that using a sense resistor on one or two PGND pins will increase the potential of those particular pins relative to the other PGND pins.

    Instead you would need to tie all PGNDs together before tying the GND node to a sense resistor. The sense resistor would also need to be a very low resistance (no more than 10mΩ). However, this will still increase the device's GND potential relative to the true GND potential. Has your customer considered high-side current measurement, with a shunt between PVDD and the device?

    Regards,
    Brian Angiel