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OPA2188: opa2188 damage in amp driver circuit

Chen Alex1
Genius 3005 points
Part Number: OPA2188
Other Parts Discussed in Thread: OPA188, OPA2277

Tool/software:

hi Sir

Our company is a hypot tester manufacturer rating 5kv output to apply the isolator device

old design is use the ADI/OP2177 to driver the High voltage transformer

due to cost down, new version choose the TI/OP2188, but pilot run 100 pcs, fail 10pcs, IC Damage

may I know if the  ESD or EFT rating Different between ADI/OP2177 & TI/OPA2188?

Thanks

  • 0
    TI__Mastermind 22117 points

    Chen,

    The ESD ratings are listed in the data sheet for both devices.  I cannot find the ADI ESD rating table (contact ADI for this information).  Below is the absolute maximum table from OPA2188, as well as the input diode structure from the electrical overstress section of the OPA2188 data sheet.  Note that the inputs on the OPA188 have anti-parallel ESD protection diodes that do not allow a differential input voltage.  The ADI device allow a full differential voltage equal to the power supply.  If your application requires wide differential voltage this could be an issue.

    I think it is likely that the issues are not ESD but are some other form of electrical overstress.  You will have to provide more detail on circuit operation and potential electrical overstress events.  Power up and power down are common events that initiate overstress.  

    best regards, Art

  • 0 in reply to Art Kay
    Genius 3005 points

    HI SIR

    that is a sinwave generator circuit, replace the ADI/OP2177 in IC22A

    SINE+ (TP1)  is  sinwave  output, and to connect the 100W amplifer,  connect the high voltage amp of 5000V, output

    the IC22A damage, 100pcs fail 5pcs, but ADI is safe

    did you have any advise?

    thanks

  • 0 in reply to Chen Alex1
    TI__Mastermind 22117 points

    Chen,

    Below is a link to an E2E post showing an output protection circuit for OPA188.  You could implement something like this at the output of IC22A.  

    https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/975001/opa2188-opa2188-output-protection

    Below is a cookbook circuit on the subject of protecting op amp outputs:

    https://www.ti.com/lit/an/sbaa372a/sbaa372a.pdf?ts=1735594396003

    I understand that the ADI device does not exhibit the issue.  However, it is likely that some of the ADI devices are being damaged but the particular ADI device is more robust than the OPA2188.  It is possible that you might find a TI device that would be as robust as the ADI device in this application.  However, I think it would be advisable to add protection between IC22A and the high-power amplifier, as the damage you are seeing is an indication of a problem even if it doesn't seem to be an issue with the ADI device.  Nevertheless, I will say that the ADI OP2177 is a very old bipolar technology and the TI OPA2177 is a CMOS chopper amplifier.  The TI OPA2277 is an old bipolar device with similar specification an performance to the ADI OP2177.  I would expect the OPA2277 device may perform similar to ADI OP2177 from a robustness perspective.

    Best regards, Art