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DRV8847: the diagnosis of this chip

Chen Melina
Intellectual 945 points
Part Number: DRV8847

Hi

I also read TI's H bridge chip: DRV8847 today. I don't quite understand the diagnosis of this chip. Do you have technical support to help solve it?

1. As shown in the figure, inside the chip, SW1_HS, SW1_LS, SW2_HS, SW2_HS and MOS are complementary.When HS1 closes, SW1_HS closes?

2. When point A is the power supply, what is the voltage of point B?

What is the voltage at point B when point A is 0V?

Could you please explain how this diagnosis works in a little more detail? How does the internal current source work in practice?If there is any technical support, I will contact you by phone.

Thank you,

  • 0
    TI__Guru 56650 points
    Melina,


    DRV8847 supports passive open load detection. The passive open load detect also refers to the offline open load detect, where the detection of open load is carried before the driver is turned on. This diagnostics features ensures that the load is connected to the driver before switching it on, however, this scheme cannot detect if the motor terminal got disconnected from power-stage during the motor operation.

    During the detection, , the high-side and low-side FETs of both half-bridges (OUT1 and OUT2) remains in Hi-Z state.

    We do have an open load detection apps note. It will be published soon.