• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 424 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: DRV8714-Q1

Chanchal Gondane
Prodigy 30 points
Part Number: DRV8714-Q1

Hi,

I am using the DRV8714 IC for Half-Bridge Control in that i am using the drive PWM mode.

If i set HBx_HL = 0 or 1  and HBx_FW = 0 my function is working as expected and i am getting the expected output.

But if i am setting HBx_HL = 0 and HBx_FW = 1 that is PWM Low-Side Passive FW conditioned my GHx and GLx is working as expected but my SHx pin where  i want inverted PWM, that is i am not getting there i am getting continuous LOW output. Let me know why this is happening.

my setting for Register configuration is as follow: 

BRG_CTRL1 = 0xE0U   

PWM_CTRL1 = 0x1BU

PWM_CTRL3 = 0xB0U

PWM_CTRL4 = 0xF0U

 Regards,

Chanchal

  • 0
    TI__Mastermind 44855 points

    Hi, 

    Thank you for your questions.

    With HBx_HL = 0 and HBx_FW = 1, it is PWM High side Passive FW, not PWM Low-Side Passive FW

    >> i am not getting there i am getting continuous LOW output.

    I am not sure how you connect external load, but hopefully by using PWM low side Passive FW by HBxHL=1 could solve your issue.

    If not, I sugget to to check whether IC has fault condition. We can check nFLT pin or  IC_STAT1 register.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    Prodigy 30 points

    Hi,

    sorry for my mistake 

    my conditioned is With HBx_HL = 1 and  also HBx_FW = 1, it is PWM Low-Side Passive FW

    This condition is not working, GHx and GLx is working as expected but my SHx pin where  i want inverted PWM there i am getting continuous state.

    Regards,

    Chanchal

  • 0 in reply to Chanchal Gondane
    TI__Guru 55615 points

    Chanchal,

    If the gate signals look normal, I am not sure why you are not seeing PWM on SHx pin unless something is wrong with the external FET.  

    Just to clarify, with conditions above, you are seeing a constant "L" signal on GHx and PWM on GLx like the truth table above?  If that is the case and FET is switching as expected, SHx should also show PWM.

    If you have scope captures and a schematic, it would be helpful.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Prodigy 30 points

    Thanks for the reply