Tool/software:
Hi every one，
Recently, when we used AMC3302-Q1 and TLV316QDBVRQ1, we found that when the current rise slope is below 20A/us, the output voltage is relatively accurate, and when the current slope is dozens of A/us, the voltage value is larger after the difference is converted into a single-end output. What causes this? (The value of the shunt is 0.1mΩ, and the AMC3302 magnification is 41.)
Hi Huajian,
In our switching characteristics section, we specify output rise and fall time.
How many dozens of A/us is the slope? I think it would be helpful to look at the data at the amplifier output as well to see how accurate it is there.
Best regards,
Eva
Hi Eva,
We have now measured the differential output waveform of the AMC3302 using a low-voltage differential probe, the single-ended output waveform of the TLV316 using a normal voltage probe, and the true current waveform measured by the Roche coil. As shown below:
When the current slope is 2A/us, all voltage signals are very good; The current slope is 12A/us, and the waveform is barely good. However, when the current slope is 39A/us, the output of the AMC3302 is not linear, and the voltage changes when the current does not rise. What do you think is the reason for this phenomenon
Hi Alexander，
Sorry to correct the test, the capacitor parameters have been modified, C20 and C23 have been modified to 10pF, and C22 has been removed.
I see that the step response waveform in the data sheet is very good. Could there be other reasons for this phenomenon?
