I am looking for a way to sense when the current draw in a product rises above 4 amps (no-load is about 2.5A). I'm thinking a difference or instrumentation amplifier is the way to achieve this, but I've never designed with one. My plan is to use a 0.01-ohm resistor in either the Line or Neutral conductor to detect the rise in current, feed the voltage across the resistor (40mV) to the amp, then send the output to the ADC of a microcontroller. Since this will be plugged into a US outlet, the sustained current limit would be 15 amps.
Any suggestions as to which TI part is optimal for this?