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Tool/software:
Hi team,
I'm looking for op amps and comparators that enable high-speed overcurrent detection for compressor motor. Could you tell me the fastest solution for this?
[Requirements]
Offset voltage: <1,000 UV
Slew rate: >10 V/us
Package: SOIC (2 in 1)
GBW (MHz): >0.5 MHz
Supply voltage: >4.5 V
Short-circuit protection should be done in us.
TLV9152 + compressor is too slow.
My first thought is INA381. Alert is outputted in about 2.3usec in response to a 0.1V shunt voltage rise. Slew rate is not good enough(2V/us).
And I olso thought INA180 + LM2903.
What is the fastest solution to output alert? I hope you will give me multiple options.
Regards,
Hiromu
Hi mallika,
Thank you for your comment. I have additional question.
1. If I focused on the speed of the alert signal output, what is the best solution? (Allow for insufficient slew rate)
2. This is probably a basic question, but which item of the datasheet should I look at to confirm the time it takes to output the alert signal ?
Overload recovery time? Propagation delay? The following graph? Or, other things?
Regards,
Hiromu
Hi Hiromu,
The red line depicts the propagation delay time of comparator only. The first line in the datasheet is for a smaller step size of 20mV whereas the second line is for a larger step size from 0.5V to 4.5V.
The blue line depicts the propagation delay time from the amplifier to the comparator at small and big step sizes.
If you're concerned only about the speed of the alert signal output, then the propagation delay time of comparator only (red line) should be the parameter of interest.
Best,
Mallika Senthil
