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LM74722-Q1: LM74722

Rudra prasad1
Prodigy 40 points
Part Number: LM74722-Q1

Tool/software:

Dear Team,

We need clarification regarding the overvoltage cut off,

we are using this from past one year and we produced around 500 products using this IC and we are not found any difference in the overvoltage threshold,

but we found the increased tolerance in the overvoltage cut off, please let me know any update in the IC, if yes, please share the PCN.

The designed cut off voltage is 36V and the previous lot ICs behavior is within the range and the result is almost same but, recent batch ICs are increase to 36.5 to 36.7.

we are replacing the old Lot ICs to failed boards and after it is working withing the limit, we tested vice versa.

we are in middle of the production, please provide feedback early as possible.

Regards,

Rudraprasad V

  • 0
    TI__Mastermind 49415 points

    Hi Rudraprasad,

    OV has a min and max spread. Hence a 100mV difference in OV cutoff voltage is normal and expected.

    There are no changes in the IC.

    Regards,

    Shiven Dhir

  • 0 in reply to Shiven Dhir
    Prodigy 40 points

    Dear Shiven

    Thanks for the swift response,

    please find the resistor values used for OV monitoring,

    R1=91K 1%

    R2=22.6k 1%

    R3=4.02K 1%

    as per give limit (Vof)the Min OV is 30.11 and max is 35.6, but we observed in the recent lot it crosses 36V, find the attached report and schematic for your reference.

    NEW Batch code (448) OLD batch code (228)
    LSL- 30 USL- 36 LSL- 30 USL- 36
    SLNO Actual value Result Actual value Result
    1 36.953 FAIL 30 OK
    2 36.453 FAIL 30 OK
    3 36.955 FAIL 36 OK
    4 36.453 FAIL 36 OK
    5 35 OK 36 OK
    6 36.954 FAIL 36 OK
    7 34 OK 36 OK
    8 36.953 FAIL 30 OK
    9 35 OK 30 OK
    10 36.954 FAIL 36 OK
    11 36.951 FAIL 36 OK
    12 36.453 FAIL 36 OK
    13 36.453 FAIL 36 OK
    14 36 OK 36 OK
    15 36.395 FAIL 36 OK
    16 36.651 FAIL 36 OK
    17 36 OK 36 OK
    18 36 OK 36 OK
    19 36.453 FAIL 36 OK
    20 36.453 FAIL 36 OK
    21 36.551 FAIL 36 OK
    22 36 OK 36 OK
    23 36 OK 36 OK
    24 36.548 FAIL 36 OK
    25 37.151 FAIL 36 OK
    26 36 OK 36 OK
    27 36 OK 36 OK
    28 36 OK 36 OK
    29 36 OK 36 OK
    30 36.451 FAIL 36 OK
    31 37.111 FAIL 36 OK
    32 36.553 FAIL 36 OK
    33 36.554 FAIL 36 OK

    please let me know any input is require analyzing this.

  • 0 in reply to Rudra prasad1
    TI__Mastermind 49415 points

    Hi Rudra,

    The max value of OV(R) comparator is 1.33V

    Hence the maximum value for over voltage cutoff can be 38.9V with your resistor set.

    Regards,

    Shiven Dhir