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TPS2663: IMON pin output at overcurrent

Part Number: TPS2663

Hi,

In the datasheet of the TPS2663, it is stated that the IMON pin outputs an output current proportionate to the measured current, which can be translated via a resistor to a voltage.

This is shown in figure 7-13. However, it is nowhere explicitly stated if the output of the pin is clipped at the value it reaches at 6A load current (167uA) nominal. As the IC can take pulse currents of 2x the current limit (TPS26633), this makes it unclear what the IMON pin will do during such an event? Will it output double the current, or stay clipped at 167uA? This is important in our application as this could cause an overvoltage on the ADC pins.

Can this be clarified?

  • Hi Jef,

    The IMON pin output current rises correspondingly till 12A. Please use equation (7) in the datasheet to size the R(IMON) such that V(IMON) is limited to your ADC range.

    V(IMON) = Load current * 27.9uA/A* R(IMON)

    Where load current during 2x pulse support is 12A.

    Best regards, Rakesh