• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 30 subscribers
  • Views 128 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.

DRV8714-Q1: Motor stop when increasing duty cycle close to 100%

Jayden Li
Expert 3205 points
Part Number: DRV8714-Q1

Tool/software:

Hi team,

My customer is facing a issue when using DRV8714-Q1.

When they try to increased the duty cycle from 0% to 100% w/ duty step 10/1024 every 10ms, and they found that when the duty cycle is close to 100, maybe 90+%, the motor stopped. Which is very weird.

Below is the waveform: CH1: current, CH2: GH1, CH3: IN1, CH4: O_MOTOR_OUT+. You can check below schematic for the net position.

Below is the schematic:

Support need:

1. Help review the schematic to see if any risk lead to this issue

2. help analyze why this would happen. Thanks! 

Thanks!

Jayden Li

  • 0
    TI__Mastermind 44405 points

    Hi Jayden

    You are posting on public E2E.

    Could you provide your customer's name and application use case. I will feedback to you for schematic review. Please create internal post if needed.

    I could see CH3:IN1 signal stopped then motor driving is also stopped. This could be normal. Looks like MCU provide PWM signal to DRV8714-Q1's IN1 pin. If PWM singal at IN1 stopped, DRV could not spin motor with PWM anymore.

    regards

    Shinya

  • 0 in reply to Shinya Morita
    TI__Expert 3205 points

    Hi Shinya,

    The application is sunroof.

    Is it possible that some kind of fault was triggered at that moment, I am asking customer to check if the fault register bit was set.

    Thanks!

    Jayden Li

  • 0 in reply to Jayden Li
    TI__Mastermind 44405 points

    Hi Jayden,

    Could you share customer name?

    MCU just stopped providing PWM signal to DRV. So may not have any fault condition.

    regards

    Shinya