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Original question:

Looking for driver for a Single Phase Brushless (BLDC) Motor

TMP815 Motor driver

Guido Kneis
Prodigy 30 points
Other Parts Discussed in Thread: TMP815

Hello,

i am Looking at TMP815 to drive a single Phase BLDC. That Motor has a build in Hall Sensor with only one Output pin. Other manufacturers of similar devices recomand to supply the hall sensor by the ICs 5VREG Output and use the H+ Input only while connecting H- to half of 5VREG using external voltage divider. Would that also work with TMP815?

Page 3 of the datasheet states 220pF at CPWM for a 30KHz oscillation but the sample application Circuit on page 11 states 100pF for 30KHz, wich one is correct?

I am trying to drive a trorque Motor "Sonceboz 4246", Coil DC resistance 2.4Ohm, Inductance 25mH. What would be the ideal capacitor value for CPWM?

Thanks a lot for your help

  • 0
    TI__Guru 61310 points

    Guido,

    Thanks for posting on the MD forum!

    The team is looking into this and I will get back to you this week.

    Regards,

    -Adam 

  • 0 in reply to Adam Sidelsky
    Prodigy 30 points

    Hi Adam,

    thanks for picking this up, any ideas so far?

    cheers

    Guido

  • 0 in reply to Guido Kneis
    TI__Guru 61310 points

    Guido,

    Sorry for the delay, here are our thoughts:

    i am Looking at TMP815 to drive a single Phase BLDC. That Motor has a build in Hall Sensor with only one Output pin. Other manufacturers of similar devices recomand to supply the hall sensor by the ICs 5VREG Output and use the H+ Input only while connecting H- to half of 5VREG using external voltage divider. Would that also work with TMP815?

    [AS] Yes, this should work assuming H+ varies from 0 to 5VREG.

    Page 3 of the datasheet states 220pF at CPWM for a 30KHz oscillation but the sample application Circuit on page 11 states 100pF for 30KHz, wich one is correct?

    [AS] 220pF is correct. The 100pF appears to be a copy/paste when the Application section was added although I have not been able to confirm this definitively.

    I am trying to drive a trorque Motor "Sonceboz 4246", Coil DC resistance 2.4Ohm, Inductance 25mH. What would be the ideal capacitor value for CPWM?

    [AS] What does the motor manufacturer recommend for PWM frequency? With this value and the typical charge/discharge an high/low voltage, the capacitor can be calculated.

    Regards,

    -Adam