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Original question:

OPA192: sine-wave-amplifier-to-drive-inductive-load-at-a-constant-current

LM48100Q-Q1: pure sine wave power amplifier

Joe Miller1
Intellectual 360 points
Part Number: LM48100Q-Q1

Tool/software:

Dear Sir/Madam,

I am looking for a suitable device to be able to produce a burst of 1A peak current sinewaves at 50Hz into a load that has an inductive reactance of 8.3mR.
Single 5V or 12V supply would be perfect.
I do not want to use PWM but instead provide analog input like from a DAC.
I was looking at class AB however I cannot find a suitable device that provides control to external mosfets.
Other ideas are most welcome. 

Regards Joe

  • 0
    TI__Mastermind 44935 points

    Hi Joe,

    Was the solution from the OpAmp team helpful?  We do not have an audio amp with external mosfets.  The LM48100Q-Q1 may be able to do what you need, at it has a 1.4A short circuit current and uses a 5V power supply.

    Regards,
    Gregg Scott  

  • 0 in reply to Gregg Scott
    Intellectual 360 points

    Dear Gregg,

    Thank you for the reply.
    LM48100Q-Q1 was just a part I picked as an example.
    AD has a bias driver LT1166 which looks quite interesting however requires a lot of parts and dual supplies.
    I would like to use a single 5V supply.
    No PWM. I need to use an analog input voltage to be able to produce a 1A sine wave into an inductive load at very low frequency. 
    Hoping to control the current into the load without hitting over current protection or signal distortion.
    The concept diagram is shown below.

    Regards Joe

  • 0 in reply to Joe Miller1
    TI__Mastermind 44935 points

    Joe,

    Do you need a single-ended output as you have drawn or can you use the BTL output in the LM48100?  For a single ended supply you should use a BTL output.  This will remove the need for large series capacitors.  

    Regards,
    Gregg Scott

  • 0 in reply to Gregg Scott
    Intellectual 360 points

    Hi Gregg,

    I have sent you a friendship request and private email. Hope we can discuss offline.

    Regards Joe