DRV8353RS-EVM: drv8353rs Some Questions

Hi VJ.Pandi,

Thank you for posting to the Motor Drivers forum!

Unfortunately, I did not get to look at this today, but I will get back to you with a response shortly.

Best,

~Alicia

Hi Alicia Rosenberger,

ok. I will wait.

Regards, 

VJ.Pandi

Hi VJ.Pandi,

When you say that INHx/INLx is on, do you mean that it is set to '1' (or high)? And when INHx/INLx is off, that it is set to '0' (or low)? 

If not, could you clarify what you mean when you say INHx/INLx is on/off?

Best,

~Alica

Hi Alicia Rosenberger,

question no 2

INHx =1 (ON) and INLx =0 (OFF) it' s wave form is shift

Regards, 

VJ.Pandi

Hi VJ.Pandi,

For Fault Status Register 1 (0x00h) and Fault Status Register 2 (0x01h), what values are you getting?

Best,

~Alicia

Hi Alicia Rosenberger,

getting value is drv8353,

 Register 0 = 0x0000

 Register 1 = 0x0000

register 2 =0x0000

register 3 =0x03FF

register 4 =0x07FF

register 5 =0x016D

register 6 =0x0283

register 7 =0x0000

Regards, 

VJ.Pandi

Hi VJ.Pandi,

When you are measuring GHx, where exactly are you probing?

Best,

~Alicia

Hi Alicia,

drv8353rs output pin three high side pins are measured

Best,

VJ.Pandi

Hi VJ.Pandi,

What kind of probe are you using to measure GHx? 

Because the high side gate (GHx) is referenced to the switch node and not ground, in order to get the most accurate measurement, a differential probe is needed. 

Best,

~Alicia 

Hi Alicia, 

No normal DSO probe (RIGOL DSO)

Hi Alicia, 

No, normal DSO probe (RIGOL DSO)

Hi VJ.Pandi,

The reason why you are seeing a 10V offset in GHx is because GHx is referenced to the switch node and not ground. Using a differential probe for GHx should correct this.

Best,

~Alicia

Hi Alicia, 

Best differential probe link send me

Then question no 3 answer mam question in bottom please check.

Thanks.

Hi VJ.Pandi,

While the differential probe will allow for you to account for the GHx output as it floats at VM supply voltage due to LS MOSFET being off, you do not necessarily need one as this behavior is expected.

Regarding your third question, I will aim to provide a response by the end of the week.

Best,

~Alicia

Hi Alicia,

Ok waiting, differential probe  link

Thanks

Hi VJ.Pandi,

Here is a website that compare various differential probes that you can choose from as the kind of differential probe that you use depends on your bench setup and your testing needs: https://www.oscilloscopesource.com/oscilloscope-probes/type/differential-probes 

Throughout your whole setup, have you noticed the nFault pin pulling low? 

Best,

~Alicia

Hi, Alicia,

I agree with u, but the DRV8353 datasheet says, that when the INHx and INLx both are in 0 states the GHx and GLx that also in 0 states only. SHx is HiZ state. why is this datasheet saying that? The datasheet has to tell GHx also the HiZ state.

Thanks.

Hi VJ.Pandi,

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

Best,

~Alicia