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TPS3840: TPS3840 Vrail_max

Tetsusei Kan
Prodigy 180 points
Part Number: TPS3840
Other Parts Discussed in Thread: TPS3890

Hi,team

I am looking for an IC to monitor a 24V power supply.

I have two questions.

Q1.

I'm considering TPS3840, but I'd like to ask a question about Equation (8) in the datasheet
Vrail_max = 10 × (10,000 ÷ (10,500 + 10,000)) = 20.5V
Equation 8 is written as above, but isn't “10 ×” correct instead of “10 ÷”?

Q2.

If there is another IC suitable for 24V power supply monitoring, please introduce it.
It is necessary to have OD output and CT terminal.
It is more desirable to use an IC that can adjust the monitoring voltage by dividing the resistance.

thanks.

  • 0
    TI__Genius 9375 points

    Hi user,

    For #1, you're right, the equation does not work out to 20.5 V, but instead ~4.9V, which is supposed to be the actual Vrail_trigger.

    For #2, I think TPS3890 would fit your application requirements. This device has an additional SENSE pin that you can use with a resistor divider to achieve your threshold (using the adjustable version). Please take a look at Optimizing Resistor Dividers at a Comparator to properly choose your resistors.

    Thanks,
    Abhinav.