• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 713 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.

DRV8432 dead time between PWMH and PWML

ALbert Tello
Intellectual 735 points


 We are using  for signals to control DRV8432 from a DSP

PWMH1  to PWM_A

PWML1  to PWM_B

PWMH2 to PWM_C

PWML2  to PWM_D

To prevent current shoot-through, some amount of time must be provided between the turn-off event of one PWM output and the turn-on event of the other PWM output in a complementary pair or the turn-on event of the other transistor.

My question is :

It is necessary to implement a dead time between PWMHx and PWMLx  if the answer is Yes how many nano -Sec do you recommend.

Regards

Albert  

  • 0
    TI__Guru** 114905 points

    Hi Albert,

    Each PWM_x input controls the appropriate OUT_x. The OUT_x has a high side FET and a low side FET integrated into the DRV8432. This is where shoot through typically occurs. The DRV8432 has internal dead time control of 5.5nS typical per the datasheet.   Appended: To answer your question, it is not necessary to implement a dead time.

    Are you planning to use two OUT_x outputs in parallel?  the Mode pins would then be set to 010, and only  PWM_A an d PWM_B are used to control the outputs. This condition could also create a shoot through condition, which is why inductors are recommended to be placed as shown in Figure 9 of the datasheet.