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TPS2120: Reverse Current Blocking

JDJ
Expert 4736 points
Part Number: TPS2120


Hello! 

Section 9.3.6 of the datasheets says that reverse current blocking for TPS2120 is triggered by VIRCB, but only IRCB is defined. And, IRCB can be up to 2A max as shown in the electric characteristics of the datasheet.

Does this mean that for worst case, it can provide reverse current up to 2A continuously without blocking?

 

 

Thanks! 

  • +1
    TI__Mastermind 32650 points

    Hi JDJ,

    We sped the I_rcb value for this device as it is the back flow of current that generates the V_i,rcb. 

    The device compares the input voltage to the output voltage whenever it is ON to check if a reverse voltage condition takes place. In such a situation, the backflow of current will push the output voltage higher than the input across the ON resistance of the device. Since the device is ON and resistance is low, even small voltage differences can result in reverse current spikes.

    Let us take the typical example of a TPS2120 at 25C. The ON resistance here is 62mOhm. Let us assume that the I_rcb for this device is typical at 1A.

    In this situation, a 65mV difference between IN and OUT is sufficient to push 1A in reverse and cause the device to shutoff.

    Thanks,

    Shreyas