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TPS3895: What influence would be if adding a negative feedback between IN and OUT?

Zoe Yang
Intellectual 2210 points

Part Number: TPS3895

Hi team,

My customer is using TPS3895 as supervise in their encoder 5V power supply monitoring. But the 5V might be unstable due to some worse case in industrial  application. So the input signal of TPS3895 is always have a jitter at 4.1V and causes output had an unexpected pulse shown in below picture.

 

Thus, my customer add a feedback circuit R29 between In and out pin which could help improve the unstable false pulse cased by the jitter on 4.1V. Do they have any risk of violating the datasheet spec? If not violating, what is the recommended value of R29? The device is our part number, please ignore SGM895 typo.

 

  • 0
    TI__Mastermind 21090 points

    Hi Zoe,

    The R29 resistor change the thresholds of the device. Since the device is active-high, when output is not asserted, R29 becomes parallel with R14 and when the output asserts R29 becomes parallel with R23. Both cases changing the voltage divider output. If that is what they want for the design it should be fine. 

    To address the jitter. If it is just a transient, they can use a by-pass capacitor on the IN pin to prevent false faults.

    Jesse