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DRV8251: Maximum Output Current Specification

Guru 10395 points
Part Number: DRV8251

Tool/software:

Hi,

I am currently reviewing the datasheet for the DRV8251DDAR and have encountered the term "InternallyLimited" in reference to the maximum output current. However, the exact value of the maximum output current is not provided in the datasheet.

Could you please clarify the precise value of the maximum output current for this device? If the exact value cannot be disclosed, I would appreciate it if you could explain the reasons behind this limitation. Additionally, I would like to understand how the "InternallyLimited" specification translates into real-world operating conditions, such as current protection thresholds under different load and thermal conditions.

Thanks,

Conor

  • Hi Conor,

    I am currently reviewing the datasheet for the DRV8251DDAR and have encountered the term "InternallyLimited" in reference to the maximum output current.

    This is mentioned in the absolute maximum ratings specification. It means when you have a very low impedance load the current will not go above a specified limit indefinitely based on (VM / Load Z). When the load current exceeds IOCP for longer than the deglitch time the H-bridge will be disabled to protect the device. This is the current limit mentioned.

    Additionally the device features a thermal shutdown TSD protection as well. This is based on the power dissipation in the device under its operating conditions. It is possible TSD happens even if current does not exceed IOCP. Please see section 9.3 Current Capability and Thermal Performance of the datasheet page-23. Thank you.   

    Regards, Murugavel