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INA300-Q1: Over current threshold

Neal Zhu
Expert 2470 points
Part Number: INA300-Q1
Other Parts Discussed in Thread: INA300

Hi,

I would like to ask some questions about the overcurrent threshold.

1. What is the default value of the over-current threshold at the first power on? Is it judged to be over-current when the power is on?

2. Over-current threshold Setting Digital potentiometer is connected to the pin. If the digital potentiometer fails, will the over-current threshold be locked?Or what happens to the threshold?

3. Is there any recommended resistance value for the resistance configured with Delay pin time?

thanks!

  • 0
    TI__Mastermind 24075 points

    Hello Neal,

    Thanks for considering to use Texas Instruments.

    1. The overcurrent threshold corresponds to the voltage at which the INA300 output equals the voltage generated from the INA300 sourced Ilimit current across whatever Rlimit resistor you decide to use.  The Ilimit current is typically 20uA. Your output voltage is determined by your load x shunt resistance.

    2.  Not sure what digital potentiometer failure looks like. If failure means the resistance is locked, and assuming the potentiometer is connected to the limit pin, then yes your trip threshold will be locked to that value.

    3. If you are talking about placing a resistor on your delay pin.  Then ideally you should use a zero ohm if connecting to ground or supply.  If you insist on having some sort of resistance, then it should be no greater than 1kΩ.  The voltage potential at the delay pin will determine which time of the three available time settings is used.