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DRV8802 direct PWM control

Mike, Jung
Prodigy 230 points
Other Parts Discussed in Thread: DRV8802, DRV8801

Dear All.

I have a question about DRV8802.

I think xPHASE & xENBL pins can use control direction & speed through PWM control.

if these pins enable directly PWM signal,  how does the range of PWM frequency?

and are there matter that require attention to determine the PWM frequency.

 

Best regards

  • 0
    TI__Mastermind 26065 points
    Hi Mike,

    There will be no problem to go 100k for PWM frequency of the inputs.
    Normally we just go for 10k to 20k PWM to reduce or avoid audio noise.
    Note the switching loss of the MOS will be higher when PWM goes higher.
    Also note the internal PWM current regulation will kick in when the current setting level is reached, with 50k internal PWM.

    Best regards,
  • 0 in reply to Wilson Zuo
    Prodigy 230 points
    Dear Genlus

    thank for your reply.

    I hav e additional question.
    Difference of DRV8801 and DRV8802 are without/with internal current regulation.
    of course, both device use PWM control.
    if I use the DC motor and trip current is high than setting current,
    I understand
    DRV8801 continuously checks periodly(t(ocp) interval) if there is still fault condition.
    DRV8802 is disabled H-bridge, too but current regulation is operated by internal pwm.
    is ther any disadvandage compared than DRV8801?

    please give me explanation about difference of both device in detail.

    Best regards.
  • 0 in reply to Mike, Jung
    TI__Mastermind 20985 points
    Hi Mike,

    I think your understanding is correct. The DRV8801 doesn't have current regulation, while the DRV8802 does. The DRV8802 has 2 H-bridges while the DRV8801 has 1 H-bridge. We also have 3 new devices coming out, the DRV887x series, which have 1 H-bridge with integrated current regulation in an 8-pin package, capable of at least 1.5A RMS.

    Best regards,
    RE