• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 179 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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: Is it normal for this kind of waveform to appear in the dead zone?

Annie Liu
Genius 10295 points

Part Number: DRV8432

Hi Team,

Customers using DRV8332 and DRV8432 will have the waveform shown in the figure below. The schematic diagram refers to the recommended schematic diagram of DRV8332. Take the PWM complementary signal with dead zone as PWM_A input, and send the complementary PWM signal to RESET_A as the dead zone. 

Then when the power is turned on and the output is not loaded, the following waveforms are displayed in the dead zone position. Is this normal?  If it is abnormal, what could be the cause?

.

Thanks,

Annie

  • +1
    TI__Guru 56650 points

    Annie,

    "when the power is turned on and the output is not loaded, the following waveforms are displayed in the dead zone position."

    This is normal. In dead time zone, all FETs are off. The top FET and bottom FET are like a resistor divider which causes the output voltage immediately drops to half. And then, it slowly goes down due to high side gate off circuit.

    BTW, if you have further question with DRV8332, would you change DRV8432 to DRV8332 in the title to match the schematic? And then, DRV8332 support team can see it.

    Regards,

    Wang Li