• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 48 subscribers
  • Views 174 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OPA2376: Input Differential Mode Voltage Range

Brian Wang0928
Genius 10710 points
Part Number: OPA2376
Other Parts Discussed in Thread: TLV9062

In the d/s, it specifies the input common mode voltage range, how about the input differential voltage range?

Thanks. 

Regards

Brian W

  • +1
    TI__Guru 56760 points

    Brian,

    OPA2376 is an op amp and not a comparator and thus should not be driven directly with a differential input voltage.  Doing so will result in the output collapsing on one of its rails.  However, if you think of difference amplifier configuration, the maximum input differential voltage depends on the ratio of the resistors used and must be so the input voltage directly at the input terminals is within the voltage supply used to power OPA2376.

    In the normal op amp applications, it is the negative feedback that drives the negative input within the virtual short of the non-inverting input.  But if you are asking about the absolute maximum rated voltage that OPA2376 may withstand without damage, it is shown below.  Going beyond it will require use a series input resistor to limit the input current to 10mA or less.

  • 0 in reply to Marek Lis
    TI__Genius 10710 points

    Hello Marek,

    Thanks. 

    In fact, customer is using the OPA on the DC link sensing with resistor divider from 400Vdc for many years. But so far, they found there are different behaviors on OPA2376 and TLV9062 in the Solar system. The TLV9062 is ok, but OPA2376 is N.G in the testing. I will share with you in separated email. thanks.     

  • 0 in reply to Brian Wang0928
    TI__Guru 56760 points

    The main difference between the TLV9062 and OPA2376 I see is in the operation over temperature – TLV9062 input common-mode voltage extends 100mV below negative supply over entire temperature range, from -40V to 125C, while OPA2376 Vcm range is specified only at 25C.  Furthermore, I know that at 125C OPA2376 linear input common-mode voltage may extends only 400mV above negative rail (500mV higher than at 25C) and this may be the reason for different performance vis-à-vis TLV9062 – this means that at Vcm=0 on 3.3V single supply, TLV9062 would work just fine up to 125C while OPA2376 would not.