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UCC21550: Using UCC21550 as a full-bridge gate driver

Conor
Guru 12065 points
Part Number: UCC21550
Other Parts Discussed in Thread: UCC21530

Tool/software:

Hi,

We are currently considering the adoption of UCC21550, and would like to confirm the following points:

  1. Is it possible to use two units of UCC21550 to drive a full-bridge circuit? Our understanding is that by using each channel of the two UCC21550 devices to control a pair of switches (Q1 to Q4), it would be possible to configure a full-bridge driver. If this approach is acceptable, we would greatly appreciate it if you could advise us on any important design considerations, such as dead time control, power supply configuration, and isolation management.

  2. If this configuration is not recommended, could you kindly suggest any gate driver ICs with reinforced isolation that can directly drive a full-bridge circuit? Please note that reinforced isolation is a mandatory requirement for our application.

Best regards,

Conor

  • 0
    TI__Expert 8686 points

    Hi Conor,

    Thank you for your interest in our devices!

    Yes, it is possible to use UCC21550 to drive a full-bridge and would be a great fit due to its high robustness, low cost, and accurate programmable deadtime. 

    There are no reference designs for UCC21550 driving a full-bridge, however here is a reference design of the older generation device (UCC21530) being used to drive a dual active bridge design:

    In this reference design, an isolated supply is being used to power the gate driver. For a more cost effective solution depending on duty cycles needed for the application, a bootstrap circuit will work.

    If you have any further questions, please feel free to ask below.

    Thank you!

    Regards,

    Hiroki