DRV103: Simulation results with Pspice for Ti not compliant as expected on datasheet

May

Part Number: DRV103

Hi Team,

Customer built a Time Delay and relay driver circuit with the DRV103U. The expected result (output) according to the datasheet is this

They got this result after simulation

Can you help me to understand why? also can you provide the correct reference for this.

Furthermore, customer sometimes encounter this kind of error when simulation is running "internal error divide by zero" and simulation is aborted. The simulation model that i use id DRV103U in PSpice for TI.

Thank you.

Regards,
May

over 3 years ago

0 Kalin Burnside over 3 years ago

TI__Genius 13300 points

Hello May,

Could you provide the schematic & files for their setup? We do not have a premade test bench for this specific application, and I'd rather troubleshoot the actual design.

Regards,

Kalin Burnside

0 May over 3 years ago in reply to Kalin Burnside

TI__Genius 9880 points

Hi Kalin,

Please see customer response below.

I would also like to know if it is possible to modify the ON Time before the delay. actually it is 10ms
Smilulation_circuit.pdf Pspice fo Ti.rar

Thank you.

Regards,
May

0 Kalin Burnside over 3 years ago in reply to May

TI__Genius 13300 points

Hello May,

I'll respond by EOD today.

Regards,

Kalin Burnside

0 Kalin Burnside over 3 years ago in reply to Kalin Burnside

TI__Genius 13300 points

Hello May,

I ran the simulation with the following results:

I was unable to run the simulation you posted (issues with loading the DSN file).

I believe part of the issue lies with the inductance value. 10uH is extremely small, and basically equivalent to a short PCB trace. I used 500uH with the rest of the setup the same except adding load resistance.

Regards,

Kalin Burnside

0 May over 3 years ago in reply to Kalin Burnside

TI__Genius 9880 points

Hi Kalin,

Thank you for the update.

Can you share with me the parameters and files you set up in Pspice to obtain the actual results? I understand that you were not able to run the simulation that I have provided.

Thank you.

Regards,
May

0 Kalin Burnside over 3 years ago in reply to May

TI__Genius 13300 points

Hello May,

Here is the setup:

Regards,

Kalin Burnside

0 May over 3 years ago in reply to Kalin Burnside

TI__Genius 9880 points

Hi Kalin,

Customer tried to run the simulation with the same circuit as you sent it but they can't have the same results like your simulation results. They don't know if there is a particular setup when simulating with transient analysis. Can you provide the file and simulation setup for the circuit?

Thank you.

Regards,
May

0 Kalin Burnside over 3 years ago in reply to May

TI__Genius 13300 points

Hello May,

is the following the results your customer observed?

I'm not able to send the file I was working from since it was the backend file. I recreated it on the version from the product folder and got the above results. This is a much older device so I'm not sure what the process was for publishing the models back then, but it definitely does seem to be different.

DRV103_PSPICE_AIO.zip

I would suggest using a breakout board for this package and testing the device itself. If you need help finding one that will work for this package please send me a private email.

Regards,

Kalin Burnside

0 May over 3 years ago in reply to Kalin Burnside

TI__Genius 9880 points

Hi Kalin,

Just received response from customer, please see details below.

The simulation is running now but in PWM phase the current move through a negative value and a positive value (-1V to 1V) like a sinusoidal function (I don't want the negative part).
Is it like this in the real life? And have you a more recent simulation model?

Thank you.

Regards,
May

0 Kalin Burnside over 3 years ago in reply to May

TI__Genius 13300 points

Hello May,

There aren't updated models as this device is much older, so the best option may be testing using a breakout board. It should not pulse negative.

Regards,

Kalin Burnside

0 May over 3 years ago in reply to Kalin Burnside

TI__Genius 9880 points

Hi Kalin,

Please see response from customer below.

Is the output current value a sinusoidal function in real life as shown in the simulation?

Thank you.

Regards,
May

0 Kalin Burnside over 3 years ago in reply to May

TI__Genius 13300 points

Hello May,

Can you share an image of the simulation?

Regards,

Kalin Burnside

0 May over 3 years ago in reply to Kalin Burnside

TI__Genius 9880 points

Hi Kalin,

Please refer to attached pdf.

Tests.pdf

Thank you.

Regards,
May

0 Kalin Burnside over 3 years ago in reply to May

TI__Genius 13300 points

Hello May,

That is not expected behavior of the device. If you look at the figures in the D/S you will not see any waveforms centered around GND level, and there isn't anything internal to the device that would cause a shift of GND level. I believe there must be some bugs with this model causing this odd behavior. Also, if you were to zoom into that simulation I don't believe it would be sinusoidal, but even if it was it shouldn't be the case.

In terms of the oscillation itself (not centered on 0A) you would expect this in PWM mode as indicated in the figures in the D/S. The initial oscillation up to -2A/2A I believe is a bug in the simulation, not applicable to real life conditions.

Regards,

Kalin Burnside

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DRV103: Simulation results with Pspice for Ti not compliant as expected on datasheet