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Driver IC to drive MOSFET/BJT to produce sine output of 28V /100mA pkpk

Sayali Shinde
Intellectual 705 points
Other Parts Discussed in Thread: OPA552

I want to prepare Inverter that will convert 28V DC to 28V AC. I am going to use approach of H-Bridge ,for this I need driver IC which will drive Mosfet to product sine ouput of 28V AC .

Drive IC should produce gate pulse to mosfet without logic input to it.

  • 0
    TI__Expert 3355 points
    Hi Sayali,

    Thanks for your question. I'm on the applications team in the high power drivers group and can help you with your question.

    We don't have any driver ICs that switch without logic inputs. This type of circuit could be created to self-regulate without the use of a controller though. This can be accomplished using a couple of op amps and comparators.

    Since you've stated that you would like to use a half-bridge, you will want to look at class-D amplifier information. I would recommend using MOSFETs for this application, over BJTs. This will allow you to go rail-to-rail and achieve 28V sine wave from a 28V DC bus.

    Can you help me understand your requirements some more? I have a few questions.
    What frequency sine wave do you need to produce? 60 Hz? Variable? What range?
    What is your target switching frequency of your inverter?
    Is the sine wave always 28V, or will it vary?

    Please feel free to follow up. If this helped answer your question, could you press the green button?

    Thanks,
    John
  • 0 in reply to John Geiger
    Intellectual 705 points

    Thank you for your answer.The frequency i need is 4 to 6 khz  fixed and 28V sine wave would same all the time.

    Can you suggest how should I proceed or please explain in block diagram which method would be more accurate and simple.

    Regards,

    Sayali

  • 0 in reply to Sayali Shinde
    TI__Expert 3355 points
    Hi Sayali,

    Can you help me understand the intended use case for this? What is this AC output driving? Is the precision of frequency important? Or does the frequency just need to fall within 4-6kHz?

    How important is efficiency? If not too important, it may be possible to use a high voltage rail-to-rail op amp, instead of a class D amplifier circuit. You could possibly use OPA552, or similar op amps. Using a high voltage op amp would be the most simple circuit in this case. Class D amplifiers have many other considerations and require more components, though they do maintain best efficiency.

    Either way, you will need a sinusoidal oscillator circuit to create the reference waveform. You can read about sine wave oscillators here.
    www.ti.com/.../sloa060.pdf

    After creating the reference waveform to be amplified, this can be fed into a class D amplifier circuit, or a high voltage op amp in order to achieve your 28V sine wave from 28V DC bus. It will be important to ensure that your chosen circuit can handle rail-to-rail output.

    If this helped answer your question, could you please press the green button?

    Thanks,
    John