DRV8353RS-EVM: 6 PWM Mode is Not Working

veerapandiyan v

Part Number: DRV8353RS-EVM

Hi Sir,

Dear sir, I did the experiment for the below conditions in (6PWM Mode)drv8353rs.

INHx and INLx = 0, my expected output from drv is GHx =0(LOW) and GLx=0(LOW) but it's not come like that. It comes INHx=1 (HIGH) state and INLx=0(LOW) state. what is the problem, please give me the right solution.

If I give PWM inputs also comes like that output, and if I use normal gpio mode also comes like that only. but in the DRV datasheets, they have given one truth table. I did not get that table output.I attached that table also above.

over 1 year ago

0 Alicia Rosenberger over 1 year ago

TI__Expert 7270 points

Hi Veerapandiyan,

Thank you for posting to the Motor Drivers forum!

Would you mind sharing a waveform of INHx, INLx and SHx?

Best,

~Alicia

0 Brian Dang over 1 year ago

Genius 5030 points

Hi,

veerapandiyan v said:
INHx and INLx = 0, my expected output from drv is GHx =0(LOW) and GLx=0(LOW) but it's not come like that. It comes INHx=1 (HIGH) state and INLx=0(LOW) state. what is the problem

The two sentences are conflicting. Please re-read and correct what you wanted to say.

Brian

0 veerapandiyan v over 1 year ago in reply to Brian Dang

Intellectual 460 points

Hi Alicia,

I have initialize the GPIO pin configuration. the waveform below

1. INHx (yellow) = 0 (LOW) and INLx (blue) = 0 (LOW):

2. GHx (yellow) = 1 (HIGH) and GLx (blue) = 0 (LOW):

3. SHx is always high impedance (Hiz).

Thanks.

0 Alicia Rosenberger over 1 year ago in reply to veerapandiyan v

TI__Expert 7270 points

Hi Veerapandiyan,

I will aim to provide feedback by the end of the week.

Best,

~Alicia

+1 Brian Dang over 1 year ago in reply to veerapandiyan v

Genius 5030 points

Hi,

veerapandiyan v said:
2. GHx (yellow) = 1 (HIGH) and GLx (blue) = 0 (LOW):

* You wrote GLx = 0v but the blue waveform showing an 18v pulse signal. Please describe the signal more precise.

* If GHx = high (about 18v), then why "SHx is always high impedance (Hiz)"? Did you check the upper FET gate-to-source voltage?

Brian

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DRV8353RS-EVM: 6 PWM Mode is Not Working