RE: DRV8305: not getting pwm output

September 11, 2018, 2:27 am

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Hi Garrett,

1) My PVDD Voltage = 12V
2) Yes, giving 5V Enable Signal before providing PWM Inputs
3) Yes nFAULT Pin is Low
4) Only the Fault Bit Register in Address 0x1 is High, the remaining all other values are default (0)
5) Currently using 1 PWM Mode, where I am providing 500Hz 50% Duty Cycle PWM Signal.

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RE: DRV102: Part Alternate

September 11, 2018, 7:46 am

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Hi Craig,

Thanks for reaching out on E2E. I recommend looking at the DRV103, which has an adjustable oscillator frequency and 1.5A or 3A operation instead of 2.7A on the DRV102. Note that the supply voltage on the DRV103 is 40V, instead of 60V on the DRV102.

Thoughts?

Thanks,
Arthur Huang

DRV102: Part Alternate

September 11, 2018, 4:27 am

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Part Number: DRV102

Hello,

I noticed that DRV102 is in Last Time Buy.  Is there any alternate?

Thanks

RE: BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM using with LAUNCHXL-F28027F

September 11, 2018, 7:57 am

≫ Next: RE: DRV8303EVM: Standalone

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Hello Sean,

Yes I am using the instaSPIN-FOC lab. 

I started off with lab02b/c so that the motor parameters could be identified in user.h (per a TI forum thread with similar issue). This lab was a success in turning on the motor (rotor moving) however it does not run the pump nor does the motor reach the referenced speed. 

Attempting lab05b or lab10a (again per a TI forum thread with similar issue) I get compilation failures "fatal error #35: #error directive: The flux estimation frequency is not defined in user.h " therefore I am unable to load either of these to the board. 

I have already verified that the input DC voltage is correct for the boost board and my current max is based on the motor.  

I thought maybe there was an issue with the motor/pump however using the driver from the motor manufacturer as well as another competitor driver it seems to work as expected.

 

RE: DRV8303EVM: Standalone

September 11, 2018, 8:03 am

≫ Next: DRV8702-Q1: stall current fault

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Mohammad,

TMS320F28035 is used in DRV8303EVM. So, it is possible supporting standalone operation. But, we needs C2000 team support.
You can download C2000 controlSUITE and motorWare softwares for TI website as the below link, and then you can find the example projects for motor drive and its user guide in these two packages.
www.ti.com/.../tools-software.page

"can I set the DRV8303 to work on the velocity control using the GUI and then saving the parameters so that it can work on the velocity control but in standalone without the GUI? Thanks for help"
I believe so. Please consult with C2000 team for the detail.

DRV8702-Q1: stall current fault

September 11, 2018, 8:16 am

≫ Next: DRV8886AT: Detecting stepper motor 2 by Back EMF

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Part Number: DRV8702-Q1

Hi team,

I'm writing you to ask  two questions about DRV8702-Q1.

Question 1:  Stall current detection failed

The customer use Standard PWM Control Interface mode, during toff period, the current drops. The required stall current is 20A, the customer doesn't use internal current detection of DRV8702. They use ADC integrated in the MCU to sample current, and when the current ups to 20A, the MCU control the motor stop. The ADC's sampling rate is 4k, which is much smaller than PWM's frequency(20k).

The problem is that when the stall occurs, sometimes it can't detect the stall current.

Could you please help give a solution about the question?

In addition, if I add a RC filter on the output of the amplifier(shown as below), how should I set the value of R and C so that it can't affect the performance of the amplifier. Could you tell me the input resistor and feedback resistor of the amplifier?

Question 2:  nFault pin

Why is the nFault pin not recommended to connect to AVCC? Could you please help explain it?

Thank you very much!

Sherry

DRV8886AT: Detecting stepper motor 2 by Back EMF

September 11, 2018, 8:56 am

≫ Next: RE: BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM as a DC motor driver with Matlab Simulink

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Part Number: DRV8886AT

Hello,

I am using your stepper motor driver, DRV8886AT, to drive stepper motor 1 and want to detect stepper motor 2 by Back EMF. Motor 1 and motor 2 are contacted by a gear. Do we have a devices for this application?

Regards,

David

RE: BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM as a DC motor driver with Matlab Simulink

September 11, 2018, 9:22 am

≫ Next: RE: DRV8323: SPI issues Switching from DRV8301 to DRV8323

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Hi Tobi,

Please take a look at the following blog series on designing PI controllers:
e2e.ti.com/.../teaching-your-pi-controller-to-behave-part-i

Additionally, in this thread asking similar questions about building BLDC controllers using Matlab/Simulink, there is an example Simulink model for FOC control of a PMSM that you may find useful:
e2e.ti.com/.../1251229

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RE: DRV8323: SPI issues Switching from DRV8301 to DRV8323

September 11, 2018, 9:24 am

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Hello,

So it appears that we had to change the baudrate by quite a bit, because the example code sets up the clock to run at 60MHz instead of 90. Also I would just want to point out that the header files for this device seem very incomplete I got them to work after a little bit of time but it seems like something you guys might want to address.

Thank you,

Louie

DRV8323: SPI issues Switching from DRV8301 to DRV8323

September 6, 2018, 10:43 am

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Part Number: DRV8323

I'm trying to bring up our new board which is switching from the DRV8301 to the DRV8323, I have the SPI connection up and working but I'm getting some weird behavior and  I'm wondering what I'm doing wrong.

 

Here what happens when I run the given HAL_setupDrvSpi() function:

It is running through all the registers and reading them in, the values should follow the default values shown in the datasheet but they do not for some reason.

 

So instead I wanted to try and write our own values and see if they are reflected after a read so I wrote a test function:

Which creates these signals the first picture is the first read, and the write, then the final read:

I'm wondering if there's something obviously wrong here?

RE: BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM as a DC motor driver with Matlab Simulink

September 11, 2018, 1:09 pm

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Hi Garrett and Tobi,

Here is the documentation link for the MathWorks PMSM FOC example: (login may be required)

https://www.mathworks.com/help/supportpkg/texasinstrumentsc2000/examples/permanent-magnet-synchronous-motor-field-oriented-control.html

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MathWorks also has a couple videos which might be useful:

• PMSM Control Using TI F28027 LaunchPad
• PMSM Control Using TI F28069 LaunchPad

Cheers,

-Brian

BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM as a DC motor driver with Matlab Simulink

September 10, 2018, 5:18 am

≫ Next: RE: DRV8801-Q1: Charge Pump frequency

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Part Number: BOOSTXL-DRV8305EVM

Hello,

I want to use the BOOSTXL-DRV8305EVM as an motor driver for a DC motor.

can someone give me some tips or an example how to realize it with Simulink.

Thank you very much

Best regards Tobi

RE: DRV8801-Q1: Charge Pump frequency

September 11, 2018, 2:42 pm

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Kevin,

According to my bench test result, the charge pump frequency of the DRV8801-Q1 is 162kHz.
The charge pump frequency doesn't change when I change input voltage from 8V to 36V.
Sorry, I cannot find this characterization data. But, generally, we can assume 20% tolerance.

DRV8801-Q1: Charge Pump frequency

September 11, 2018, 7:48 am

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Part Number: DRV8801-Q1

Hello!

I was wondering what frequency the charge pump of the DRV8801-Q1 operates at? Does it move around over input voltage range, etc? Do we have that data?

Regards,

Kevin

RE: BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM using with LAUNCHXL-F28027F

September 11, 2018, 3:28 pm

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Did you update the user.h with the identified values? Can you post your user.h file?

Sean

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BOOSTXL-DRV8305EVM: BOOSTXL-DRV8305EVM using with LAUNCHXL-F28027F

September 10, 2018, 7:25 am

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Part Number: BOOSTXL-DRV8305EVM

Hello

I have TI PN: BOOSTXL-DRV8305EVM with LAUNCHXL-F28027F. 

I am using the above to drive a 3-phase BLDC sensorless motor (24V, 6.8A max) that runs a pump.  Using the project solutions  I have gotten the motor to run however the pump that the motor runs isn't turning on. The current draw is less than the nominal. I also notice that the referenced motor RPM is never reached. Which project lab can I fully operate the motor? Please advise. 

RE: DRV8305: not getting pwm output

September 11, 2018, 4:37 pm

≫ Next: RE: I'm looking to drive a low voltage, low amperage motor, and I'm wondering if TI has any applicable nMOS transistors

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Hi Rashi,

Are you testing with the motor connected, or are you directly observing the outputs of the IC? If your motor is hooked up, please disconnect it for now to make debugging easier.

Can you measure your inputs on the INLA/INHB/INLB pins? If all three of those inputs are low, then as per the State Table for 1-PWM mode, all of the gate outputs will be held low.

Thanks,

Garrett

RE: I'm looking to drive a low voltage, low amperage motor, and I'm wondering if TI has any applicable nMOS transistors

September 11, 2018, 4:49 pm

≫ Next: RE: DRV10970: What will happen if VINT is short?

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Thanks Chris. Any schematic available showing connections of CSD88539ND?

RE: DRV10970: What will happen if VINT is short?

September 11, 2018, 6:24 pm

≫ Next: DRV8860: Can it endure 50V Pulse voltage for 350ms once?

≪ Previous: RE: I'm looking to drive a low voltage, low amperage motor, and I'm wondering if TI has any applicable nMOS transistors

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Hey Lacey,

Our experts have been notified and should answer relatively soon.

Best,
-Cole

DRV8860: Can it endure 50V Pulse voltage for 350ms once?

September 11, 2018, 7:57 pm

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Part Number: DRV8860

Hi,

  Customer do the test of 50V pulse voltage for 350ms once, some of the device broken; They want to know whether it can burden 50V pulse voltage for 350ms？