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OPA2990: OPA2990

shivaraj r
Prodigy 140 points
Part Number: OPA2990
Other Parts Discussed in Thread: OPA2991, OPA2994, OPA4991, OPA991

HI

i am using OPA2990 i need one application input +/-10V i am driving max current 10mA current out put side i nee 40 to 50 mA boosting same voltage output i need because load side 40 mA it should sink kindly suggest suitable part this device +/- 80mA but it will boost current  

, 

Regards,

shivaraj

  • 0
    TI__Guru**** 164436 points

    Shivaraj,

    What is the maximum frequency or rise falls times? What will be the maximum ambient temperature in the system?

    OPA2990 can do +/-40mA, but no data sheet specifications has limits that cover 40mA. Typically it will work. 

  • 0 in reply to Ron Michallick
    Prodigy 140 points

    Kindly suggest any other part for this application 

  • 0 in reply to shivaraj r
    TI__Mastermind 22072 points

    Hello Shivaraj, 

    You may try the OPA2991 or the OPA2994: 

    OPA2991: 

    OPA2994:

    All the best,
    Carolina

  • 0 in reply to Caro Walter
    Prodigy 140 points

    thanks caro,

    OPA990IDBVR i am planning to use this part single channel actually i need 16 devices 16 channels

    i am created OPA990IDBVR circuit .please suggest i should use OPA2991 

    i am driving input 10 volts 10 mA current    it should drive 40mA output load. my output load required signal from this circuit 40mA.

    Kindly update i need input ASAP.

    Regards,

    shivaraj.r

  • 0 in reply to shivaraj r
    TI__Mastermind 22072 points

    Hello Shivaraj, 

    Yes the OPA2991 is the dual version of the op amp. The op amp is available in single (OPA991), dual (OPA2991), and quad (OPA4991). Since it is the same device, they share 1 datasheet and 1 model. 
    Due to design needs being 16 channels, I would implement 4 quads. 

    Here is my TINA sim: 4111.80mA_OPA991.TSC

    The orderable on ti.com for the single channel OPA991 is: OPA991IDBVR

    All the best,
    Carolina

  • 0 in reply to shivaraj r
    TI__Mastermind 22072 points

    Hello Shivaraj, 

    If the issue was resolved, please select "This resolved my issue" 

    Have a nice day! 

    All the best,
    Caro

  • 0 in reply to Caro Walter
    Prodigy 140 points

    OPA29991  WSON-8(DSG)   package i am choosing   i will use 2 channel  i will test one channel at a time  my specification requirement mentioned below

    I/P : +/- 10V @5mA max

    O/P: +/-10V @50mA max - non isolated

    Gain: 1

    Freq: 0-15 kHz

    for this i need thermal calculation  client asking  and i am using +/- 15 v for vin for device. 

  • 0 in reply to shivaraj r
    TI__Mastermind 27320 points

    Hi Shivaraj,

    Luckily we do provide the thermal characteristics to make running thermal calculations possible.

    Since you are wanting to use the DSG package that has a thermal pad, you are going to have a relatively low thermal resistance. 

    I wrote this article called Understanding Thermal Capabilities of Automotive Class-D Amplifiers that goes into understanding how to calculate the thermal capabilities of a device. The focus of this article was Class-D amplifiers and go into heatsinks, but the basic principal is still there. Where:

    Looking at the formula, you would know what conditions this system would be in so you will likely have the ambient temperature, the datasheet has provided the thermal resistance. A quick calculation is needed to find the total power dissipation, which would be Pd_total = Pd_output + Pd_input + Pd_quiescent. Also note that even if you only have one channel outputting 50mA, your quiescent power will still include both channels. I would also recommend using the worst case quiescent current. 

    Pd_output = (15V - 10V)*50mA = 250mW

    Pd_quiescent = 2*(15V - (-15V))*750uA = 45mW

    Pd_input = (15V - 10V)*5mA = 25mW

    That leaves you trying to solve what the junction temperature would be. Which will be dependent on what the ambient temperature is. 

    Best Regards,

    Robert Clifton