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SM72295: Half-Bridge Configuration?

Nicholas Ipri1
Prodigy 200 points
Part Number: SM72295
Other Parts Discussed in Thread: UCC27301A-Q1, UCC27289, UCC27211A, UCC27201A, UCC27282, UCC27284, UCC27311A-Q1, BQ2031

Is it possible to use this part in a single half-bridge configuration i.e. the 'A' side to implement a low-cost single phase MPPT charge controller while leaving the other side unused? Currently, I am using this part in a configuration similar to the attached schematic. TIA

  • 0
    TI__Genius 10335 points

    Hey Nicholas,

    Thank you for your question regarding the SM72295.

    This device is dual half-bridge drivers in parallel with some added protection features such as OVP and current sense. You are able to use only 1 of the side of this as a half-bridge driver by not connecting the other half. By looking at the Block Diagram as shown below, you would need to connect VCCA and VCCB to the VCC rail in order for it to operate correctly as the LOA driver utilizes the power rail of VCCB as the diagram shows.

    We do have a large selection of half bridge devices with similar parameters but without the internal protection features like OVP and current sense. Some of these include the UCC27282, UCC27284, UCC27201A, UCC27211A, UCC27289, UCC27301A-Q1, and the UCC27311A-Q1.

    Let me know if you have any other questions.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    Prodigy 200 points

    Thanks for the advice and the suggested parts! Can any of the components you suggested be used as an MPPT charger for lead acid batteries? I currently use the TPS51601ADRBR for this purpose but I found that the part will not start switching when a PWM signal is applied unless the battery to be charge is disconnected from the output first. (because the battery improperly charges the BST capacitor which apparently prevents the part from operating properly) To work around this issue, I designed in a MOSFET in line between the output and the battery to function as a load switch which is most certainly less than ideal

  • 0 in reply to Nicholas Ipri1
    TI__Genius 10335 points

    Hey Nicholas,

    I am not sure of any of those Half-Bridge drivers being used in the MPPT charger setup, but I did find this reference material from TI on using the BQ2031 in this application. I am a part of the Non-Isolated Gate Drivers product line and so I am not very familiar with this product.

    Simple MPPT-Based Lead Acid Charger Using BQ2031

    For the device that I listed, these are just half-bridge drivers, so they could be used in a similar setup as you are looking at using the A side of SM72295, but the protection circuitry would have to be external.

    Let me know if you have any further questions.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    TI__Genius 11770 points

    Hi Nicholas,

    I just want to add that you should consider the circuit in section 5.2.2.4 of the Fundamentals of Gate Drive ICs document. 

    This circuit can prevent this start-up issue you are describing. 

    Thanks,

    Alex M.