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AMC3302: VINx to VOUTx signal delay time varies with the slope of the current?

Howard Zou
Genius 12365 points
Part Number: AMC3302

Hi,

my customer is using AMC3302+shunt to measure the current of their power stage. AMC3302's output is converted to single ended signal and fed to a comparator to do overcurrent protection.

And they will test with different current ramp waveform with different slope size.

They find that the time delay from (the instant the current cross the threshold) to (comparator output flip) will be different with different current slope size.

The larger the slope(more sharp), the longer the time delay.

So I would like to know if VINx to VOUTx signal delay time will also vary with the slope of the current, the larger the VINx slope, the longer the time delay?

  • 0
    TI__Guru 62085 points

    Hello Howard,

    In general for linear circuits, faster ramp rates with larger the input overdrive signals result in shorter, not longer output transition times.  This is consistent with standard op-amp and comparators themselves.  Would you share some images of the circuit behavior for us to analyze and we'll dig deeper?

    Note that the datasheet specifies the input 50% crossing to 90% settling of the output signal at 2.3us typical, 3us maximum.  This is shown in detail in Table 6.1, Figure 6-1, and Figure 8-4 in the application section.