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UCC27211: Hbridge gate driver IC

Shah Zaman
Prodigy 40 points
Part Number: UCC27211
Other Parts Discussed in Thread: UCC27288, , UCC27289, UCC27284-Q1, LM25145, UCC27624, UCC27614

Tool/software:

I am designing a full H-bridge circuit with an output voltage (V_DS) of +1.6V and an output current ranging from 5 to 8A. The load is connected between two H-bridges. I have considered using the UCC27211 gate driver IC, and I have also looked into other ICs such as the UCC27284-Q1, UCC27288 3-A  and UCC27289. However, I am uncertain if these can effectively drive the MOSFETs I am using. The voltage changes direction between +1.6V and -1.6V by controlling the full bridge switches. In one case, the current flows from S1 to the load and then to S4, and in the second case, the load current moves from S3 to the load and then to S2.

Could you recommend which driver IC would be more suitable for my requirements?

  • 0
    TI__Expert 6255 points

    Hi Shah,

    A full H-bridge circuit is just two half-bridges, and all of our half-bridges are capable of driving this. The current rating for our gate drivers refer to the peak source/sink current of the output stage of the gate driver.

    I can help narrow down a gate driver for you. Please let me know what your system application and characteristics (end-equipment, bias voltage, FET, etc.).

    Thanks,
    Rubas

  • 0 in reply to Rubas Khalid
    Prodigy 40 points

    My system application involves CDI water purification, with the load being a CDI cell module. Here's how it works:

    1. I charge the CDI module in one direction by turning on switches S1 and S4 for 2 minutes.
    2. After 2 minutes, I turn off all switches and discharge the CDI module through an external resistor by turn on S5.
    3. Once discharged, I turn on switches S2 and S3 to charge the CDI module in the reverse direction. This cycle repeats continuously.

    The voltage at the CDI module is 1.6V, with an output current of 5-8A. I have already designed an LM25145 DC-DC converter for the  requirement VDC=1.6V/8A. I am using the ADM20N06E FET, but I am open to recommendations. Can I use a single 5-12V supply to provide the bias voltage for the drive ICs of two half-bridges, or should I use separate 5-12V supplies for each half-bridge? Do i need isolated or non-isolated driver IC?

    Additionally, I need a power supply IC for switch S5 because its voltage changes direction. I believe an isolated driver IC would be necessary for this For S5 may be need floating supply. Can you suggest one?

  • 0 in reply to Shah Zaman
    TI__Expert 6255 points

    Hi Shah,

    Thanks for showing the diagram of how your system works. Since the switches are on for 2 minutes at a time, and the load voltage is only 1.6V, then I would recommend using a non-isolated, low-side gate driver to drive each FET in DC mode (toggling on/off). Simply use the 12V bias as VDD and have a toggle DC voltage for the IN line. I would recommend using the UCC27624 to drive S1 and S4 through OUTA and drive S2 and S3 through OUTB.

    For S5, you may need to have two back to back FETs to accommodate for the polarity change. You can tie the gates together and use another low-side driver with a floating supply to toggle on/off.

    Thanks,
    Rubas

  • 0 in reply to Rubas Khalid
    Prodigy 40 points

    Thank you very much. I have designed a driver circuit using the UCC27624 as per your suggestion and connected it accordingly. Additionally, I have connected two MOSFETs in a back-to-back configuration and used the PES1-S5-S12-M_TR for an isolated power supply. Could you please confirm if there are any issues with the circuit?

  • 0 in reply to Shah Zaman
    TI__Expert 6255 points

    Hi Shah,

    I would recommend having a 10kOhm resistor between 12V bias and ENA/ENB (not between 12V and VDD). Your 10kOhm gate resistor is very high and will yield very slow rise/fall times, but since you're only using the MOSFETs as a toggle on/off every 2 minutes, then it should be okay (I would still recommend experimenting with lower gate resistances to yield your desired rise/fall time).

    For the discharge circuit, I would recommend using the UCC27614, as that's our latest generation single-channel driver (UCC27624 is our dual-channel). Please make sure the bypass capacitors are as close to the device as possible from VDD to GND. I also recommend the 10kOhm resistor between EN and the bias supply and a small filter on IN. I would also recommend connecting the sources of the FETs to the 0V pin of the isolated power supply to keep the driver and FETs under the same reference:

    Thanks,
    Rubas

  • 0 in reply to Rubas Khalid
    Prodigy 40 points

    Thank you very much, this helps me alot can you please recommend me floating power supply  IC from TI because i want to used floating power supply from TI too.(input voltage 6-24V).

  • 0 in reply to Shah Zaman
    TI__Expert 6255 points

    Hi Shah,

    Our isolated bias supplies team may help you best, so I moved this thread into their organization.

    Thanks,
    Rubas

  • 0 in reply to Shah Zaman
    TI__Expert 8781 points

    Shah, please submit a new thread with the part number of the bias supplied you might be interested to get the help needed.

    Thank you