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Help on DRV8332

Fan Liu
Prodigy 75 points
Other Parts Discussed in Thread: DRV8332, DRV8302, DRV8305, DRV8301, DRV8303, DRV8307, DRV8308

I am going to design a BLDC motor driver module. I have some question about DRV8332 IC. I wish someone from TI can help me. The datasheet and specs on this part is not clear to me.

  • 0
    TI__Guru** 114905 points
    Hi Fan,

    What questions can we help you with?
  • 0 in reply to Rick Duncan
    Prodigy 75 points
    Rick,
    From the description of FRV8332, there are some current sense inputs. However,
    from pin description and block diagram, I cannot find  these inputs function blocks. On page 16, they put a 10 mR resistor on GND_x pin to monitor the current. From the page 10, I cannot figure out where do these inputs go. Do you have some sources or material can share on this?
    Another question is that what is the delay time from RESET_x input to the output?
    Thank you very much.
    Regards
    Fan
  • 0 in reply to Fan Liu
    TI__Guru** 114905 points

    Hi Fan,

    When external sense resistors, the voltage is generally passed to a current sense amplifier. Please refer to Figure 16 on page 26.

    The output of the current sense amplifier can then be sent to an ADC or comparator.

    The DRV8312-C2-KIT is very similar to the DRV8332. All collateral is online.


    A quick lab check yielded the following:

    With PVDD=GVDD=12V, PWMA=3.3V and PWM'ing RESET_A/ at 3kHz, the output will re-enable approximately 50ns after RESET_A goes high.

  • 0 in reply to Rick Duncan
    Prodigy 75 points
    Rick,
    Thank you very much.
    My question is that what is the internal current sense circuit data? The pin of OC_ADJ is for which circuit?
    Thank you.
    Regards

    Fan
  • 0 in reply to Fan Liu
    TI__Guru** 114905 points
    Hi Fan,

    The internal current sense (OC_ADJ) is used to turn the outputs off once the current has reached the level set by the OC_ADJ resistor. Please refer to Table 2 on page 13 for the resistor settings.

    Section 8.3.2.1.1 on page 11 has a basic description of the circuit.

    This circuit is designed for system protection.
  • 0 in reply to Rick Duncan
    Prodigy 75 points
    Hi Rick,
    That answered my questions.
    BTW, does TI has a motor driver which has similar function and performance like DRV9332 but uses external switches.
    Thank you very much.

    Regards.

    Fan
  • 0 in reply to Fan Liu
    TI__Guru** 114905 points
    Hi Fan,

    Please take a look at the DRV8301, DRV8302, DRV8303, and DRV8305.

    The devices mentioned above are similar in function but have different voltage ratings.

    Also the DRV8307/DRV8308 may be a fit. These devices have a built in control loop, reducing the demands on the micro.
  • 0 in reply to Rick Duncan
    Prodigy 75 points
    Hi Rick,
    Thank you very much for all thee kindly helps.
    Regards

    Fan