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DRV8244-Q1: SC to BATT

Pratik Acharya
Prodigy 130 points
Part Number: DRV8244-Q1

Tool/software:

While performing a short-to-battery (SC-to-BATT) test on the DRV8244 (configured as independent half-bridge), the peak current measured was 50.3 A before the driver was disabled. However, according to the datasheet, the overcurrent protection (OCP) threshold for the HW variant of the DRV8244 is specified up to a maximum of 40 A. Given that the device also includes an analog current limit circuit, why was the peak current observed significantly higher than the stated OCP threshold?

  • 0
    TI__Mastermind 24720 points

    Hi Pratik,

    There is a deglitch time that will begin once the current exceeds the OCP threshold. During the deglitch time the outputs are not disabled and if the output current is still above the OCP threshold after the deglitch time, an OCP fault is triggered. In the HW version of this device, the typical deglitch time is 6us:

    Regards,

    Joshua