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DRV8873: thermal concern

Jun Ishida
Expert 5640 points
Part Number: DRV8873
Other Parts Discussed in Thread: DRV8701

Hi team,

According to the datasheet, DRV8873 has a 10A-peak current drive but there is no current specification in abs,max rating and recommended operating conditions.

(1) Is there really no current specification of abs.max rating?

Considering the Ron from the characteristics, DRV8873 would be >2W power in case of 5A continuous operation at 50degC.

(2) Do you think we can use DRV8873 in 5A continuous operation at 50degC in spite of reaching at >2W power?

Regards,

Jun

  • 0
    TI__Guru** 114905 points
    Hi Ishida-san,

    According to the datasheet, DRV8873 has a 10A-peak current drive but there is no current specification in abs,max rating and recommended operating conditions.

    (1) Is there really no current specification of abs.max rating?

    >>> The maximum current is internally limited. This is limited by either the overcurrent protection or the overtemperature protection circuits.

    Considering the Ron from the characteristics, DRV8873 would be >2W power in case of 5A continuous operation at 50degC.

    (2) Do you think we can use DRV8873 in 5A continuous operation at 50degC in spite of reaching at >2W power?

    >>> The DRV8873 is intended to drive a peak current for motor startup and then a RMS current for operation. It is unlikely that the DRV8873 can be used in 5A continuous operation. Adding a heat sink would help, but using external FETs plus the DRV8701 would be a better approach. The FETs can be selected based on the required RDSon.
  • 0 in reply to Rick Duncan
    TI__Expert 5640 points

    Hi Rick-san,

    Thank you for your support. Could you let me know the recommended external FET with using DRV8701? The competitive part is STASTA6940 solution.

    Regards,

    Jun

  • 0 in reply to Jun Ishida
    TI__Guru** 114905 points
    Hi Jun,

    Please contact contact the NexFET forum for recommendations. The benefit of using external FETs is the RDS can be select to meet the current and power requirements.