• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 960 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BOOSTXL-DRV8323RH: interface with DSP28377S with 6xPWM mode

Min-su Kim
Intellectual 570 points
Part Number: BOOSTXL-DRV8323RH
Other Parts Discussed in Thread: MSP-EXP430F5529LP

Hi,

I'm trying to interface with BOOSTXL-DRV8323RH and DSP28377S.

I used 6xPWM mode.

below is conneting list. PWMxA, PWMxB is signal from DSP28377S.

--------------------------------------

mode - GND ( to make 6xPWM mode)

enable - VCC

INHA - PWM1A

INLA - PWM1B

INHB - PWM2A

INLB - PWM2B

INHC - PWM3A

INLC - PWM3B

 --------------------------------------

when I apply pwm signal as below, then most signal GHx is correct except GHC.

GHC should be low, but GHC is high and GHL is low.

What should I do? Is there any connection need?

I also check nFAULT, but it is high, so it might be work well.

PWM1A - pwm,  PWM1B - !pwm

PWM2A - low,    PWM2B - high

PWM3A - low.    PWM3B - low

  • 0
    TI__Guru** 114905 points
    Hi Min-su,

    Have you tried to run the BOOSTXL-DRV8323RH with a MSP-EXP430F5529LP? Using this LaunchPad will allow you to compare the differences between the inputs.

    If you don't have access to the MSP-EXP430F5529LP, please provide scope captures of the inputs and GHx/GLx outputs.
    Please provide the VM voltage and load conditions (outputs connected to a motor, outputs floating or other).
  • 0 in reply to Rick Duncan
    Intellectual 570 points

    Hi Rick,

    I have not tried to run EVM with MSP-EXP430F5529LP.

    I attached scope capture.

    signal1 - INHC

    signal2 - INLC

    signal3 - GHC

    signal4 - GLC

    VM is 25V, and outputs are floating. Motor is not connected, because motor is chattering.

    I'll wait for your answer.

    Thank you.

  • 0 in reply to Min-su Kim
    TI__Expert 4650 points
    Hi Min-su,

    If you keep all INx pins at LOW, so no driving signals, do you see the three high-side MOSFET gates float up to 20V?

    This is most likely a leakage path inside of our device causing the behavior you're seeing. If your VM rail is 25V and the Gate High signal floats up to 20V, this is not enough to actively turn on the high-side MOSFETs.