Other Parts Discussed in Thread: TPS24750, TPS24750EVM-546
Similar to the thread originally titled "TPS24751 IMON Current", as opened by user named Alex Dukhovny1, I am not seeing behavior of the IMON voltage relative to measured current through the device that matches what is described in the datasheet. On Nov 10th, 2015, Alex Dukhovny1 posted an Excel spreadsheet with his measurement results illustrating the problem. My measurement results do not match his exactly, but its a very similar behavior, with the voltage across the IMON resistor of anywhere between 1.6 and 2.0 X the expected value. It seems to be somewhat proportional to the current (the larger the current, the worst the reading).
I found the same behavior both with my own PCB design AS WELL AS the TPS24750 EVAL board.... it simply does not appear to perform as documented.
I do not see any resolution to Alex Dukhovny's original question - can we get some feedback on his posted data and the opinion of TI on this behavior?
Does TI have any measurement data and/or measurement setup documented that validates the datasheet formula for the relationship between V-IMON and I-OUT? As it stands right now it does not appear to be reliable or usable without calibration on a device by device basis, but perhaps I am overlooking something.
Thanks,
Brian Eldridge