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DRV8871: Using as a transformer driver

Bryan McLaughlin
Expert 1110 points
Part Number: DRV8871
Other Parts Discussed in Thread: DRV8844, DRV8412

I'm designing an H-Bridge circuit to drive a transformer for an unregulated isolated supply (similar to MAX13256). There needs to be dead-time control for the FETs, and overcurrent protection would be nice. 

Could the DRV8871 or similar H-Bridge driver device be suitable for this? To achieve bidirectional driving of the transformer, the direction would need to be toggled during each cycle. I'm not sure if the DRV8871 or its kin will be happy about this at 100kHz. Please advise.

  • 0
    TI__Guru** 114905 points
    Hi Bryan,

    The DRV8871 may fit your application. There are some items to be aware of:

    There is no internal watchdog to turn off the outputs if the input clock stops.
    The dead time is controlled by the device. It is not adjustable.
    The duty cycle may not be exactly 50%.
    Overcurrent protection is available at 3.6A or above. Current regulation can be set at a lower value. If activated, both outputs will active low.

    There are many alternate devices available, such as the DRV8844 and DRV8412 that maintain the duty cycle.