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DRV8323R: I think I found major defect on DRV8323RS.

February 1, 2018, 11:56 pm
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Part Number: DRV8323R

Hi this is David!

I am currently developing motor driver board with ti's drv8323rs chip(btw, I love this chip xD)

Anyways, I am using 1x PWM mode and there's a problem with this.

Whenever I put ENABLE to high it goes back to the initial value which is 6x PWM mode.(which is normal operation)

The problem here I think here is that the hall sensor line goes directly into INLA, INHB, INLB and do something with 6x PWM mode(might short since hall sensor INHB, INLB can get high on the same time)

So the motor makes some quite a loud noise before I turn into 1x PWM mode through SPI.(sometimes so large amount of current go through even the battery BMS cut the power)..

is it a defect?

if not, how can I solve this problem

Thank you for your help

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RE: DRV110: Problems with Input Voltage at 8pin version

February 8, 2018, 7:16 am
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Hi Thomas,

Allow me to contact the engineer assigned to this product. You should expect a response by Monday February 12th.

Regards,

Aaron

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RE: DRV110: Creating a refresh impulse in order to recreate the peak current

February 8, 2018, 7:18 am
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Hi Thomas,

Allow me to contact the engineer assigned to this product. You should expect a response by Monday February 12th.

Regards,

Aaron
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RE: DRV8308EVM: motor rotates with noise and gets hot after a while

February 8, 2018, 7:29 am
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Hong,

It may be a limitation of the driving method as you suggest, but we might be able to improve it.

Do you know what kind of driving method the motor vendor's controller uses? Can you share with me a datasheet or some information on this controller?

How does the noise performance compare between the 120 trapezoidal and 180 sinusoidal commutation methods for the DRV8308?
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DRV8711: DRV8711 SPI problems at higher current

February 8, 2018, 7:58 am
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Part Number: DRV8711

Hi,

We've designed the DRV8711 onto our motor drive board. We are facing problems with SPI communication when the driver current is increased. At lower currents (200 mA) reads/writes of the registers are fine. When increasing the current (600 mA), SPI writes garbage data to the registers causing unexpected behavior (eg motor gets disabled in CTRL register). Readback of the registers also fail. The FAULTn pin is not asserted.

1. Do you know what might be the problem?

Specs:

  • 48V
  • Rsense = 0.05 Ohm
  • FETs: CSD88537ND
  • 600 mA: gain=10, torque = 27 
  • Motor: ACT 23HS8430. 3.0 Amps

2. I'm having trouble getting the optimal DRIVE register settings for the combination of our FETs and sense resistor. Could you make a suggestion? 

These are the current settings:

lDriveReg->Address = 0x06;
lDriveReg->IDRIVEP = 0b10; // High-side gate drive peak current = 150 mA
lDriveReg->IDRIVEN = 0b10; // Low-side gate drive peak current = 300 mA
lDriveReg->TDRIVEP = 0b01; // High-side gate drive time = 500 ns
lDriveReg->TDRIVEN = 0b01; // Low-side gate drive time = 500 ns
lDriveReg->OCPDEG = 0b10; // OCP deglitch time = 4 µs
lDriveReg->OCPTH = 0b01; // OCP treshold = 500 mV

Thanks

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RE: DRV110: Creating a refresh impulse in order to recreate the peak current

February 8, 2018, 8:22 am
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Hi Thomas,

Happy to help with this.

I think you nailed it on the head. ENs purpose is to retrigger the Peak Current.

EN is internally pulled high. When connected to GND, EN goes low and and DRV110 current drops to 0 (ceases operation). When EN is disconnected from ground it gets pulled high internally and the DRV110 restarts operation and ramps the solenoid/relay current to Ipeak for time Tkeep, etc.

Regards,
Kevin
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DRV110: Creating a refresh impulse in order to recreate the peak current

February 8, 2018, 4:53 am
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Part Number: DRV110

Hello TI-DRV11-Ream,

I already posted a question today regarding the Input voltage of the DRV110-8-pin-version. Now I've got another question regarding a refresh Impulse. My aim is to treat the DRV110 in a way that it can retrigger the Peak Current pulse. There is no specific pin for that, but my idea was to pull the EN-pin to ground for a millisecond or so. And then wait for a second for example.

Is it safe for the IC to do that? Is there any other Option of getting the Peak current pulse again?

Thanks and cheers,

Thomas

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RE: DRV10987EVM: no EEPROM Write possible, no reaction from DRV10987EVM

February 8, 2018, 8:23 am
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Hey Ulf,

Thanks for going through the steps and providing the screenshots. They are very helpful. I'd like to apologize for the trouble you're going through as well, the team has not seen this before.

Good catch with the firmware and USB2ANY SDK. Yes, it should have installed on its own when you installed the DRV10xx EVM GUI Software so it was good that you reverted it back to the correct version.

I encourage you to try running the application as an administrator just to be sure there isn't any problems with accessing the lab view files. If that does not work, continue to run as an administrator and try replacing the config file (Setup.cfg) in the C:\Program Files (x86)\Texas Instruments\DRV109xx EVM folder.

Let me know if this changes anything.

Best,

-Cole

(Please visit the site to view this file) 

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DRV10987EVM: no EEPROM Write possible, no reaction from DRV10987EVM

February 2, 2018, 12:20 am
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Part Number: DRV10987EVM

Hi Cole,

my problem I have with the DRV10987EVM, which I described in the threat of Eric Chen at the 19. jan 2018 is still there not solved.

I have tried to install all Drivers, Libraries, Software including LVRTE2014f2std.exe several times, the problem is still there. I have tried also a second PC with Windows 7 pro, still the same problem,

Here the windows build I am using:

I hope you can help me.

Best Regards,

Ulf

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RE: DRV110: Problems with Input Voltage at 8pin version

February 8, 2018, 8:28 am
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Hey Thomas,

I'm not completely understanding your implementation. Are you trying to use the 8-pin IC on the EVM or do you have a board that is designed for the 8-pin IC and then the DRV110EVM separate for the 14-pin.

Regards,
Kevin
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RE: DRV110: Problems with Input Voltage at 8pin version

February 8, 2018, 8:52 am
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Hello Kevin,

thanks for the fast answer!

I've sketched a Little Image for you:

So what I've done was to connect the 8-pin Version to the DRV-Eval-Board in order to give both the 8-pinner and the 14-pinner the same preconditions. While the 14-pin-version makes it's Job (of Course only when the 8-pin Version is not connected to V_in), the 8pinner is just doing nothing while it's V_in Drops down to 0.5V. 
I've got 10 of These IC's and I already used 3 of them with the same result. 

Maybe you can tell me what you can measure when you measure from V_in pin to GND pin with a multimeter in Diode measurement mode. It's always the 0.5V at my Setup. 

Have you ever seen that Problem?

Thank you and cheers,

Thomas

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RE: DRV8308EVM: motor rotates with noise and gets hot after a while

February 8, 2018, 8:53 am
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Hello James,

The vendor's controller is :maxon EPOS4 compact 24/1.5 CAN  (https://www.maxonmotor.com/maxon/view/product/control/Positionierung/546714).  I don't know what kind of driving method it uses.  But it UI requires using encoder (can NOT choose hall sensor only) and I just assume sinusoidal commutation.    BTW the  motor is Maxton EC 6 455419.

I did compare the 120 and 180 commutation method and I can't tell the difference of its noise performance.  I tried to adjust ADVANCE and no noticeable difference there neither.   If I let the system auto-adaptive and it gets worse.  I tried to have the PWMF to 100Khz and no noticeable different neither so I set it at 50Khz for the tests.   Simply using oscilloscope to monitor Hall sensor U+, the waveform looks stable but I don't have instrument to see how its speed/frequency looks like.   BTW, is there a test point of current (R22-- current sense resistor, hard to get a good contact by probing the leg of the resistor). 

thanks,

Hong

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RE: DRV8881: large shunt ok?

February 8, 2018, 9:40 am
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Hi Brian,

There is not a maximum resistance, but there is a maximum voltage allowed on the xISEN pins.

73mA will violate the absolute maximum in this case.

It is generally recommended to adjust the reference voltage. In some cases increasing the sense resistor can help, but do not exceed the max xISEN voltages.
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DRV8881: large shunt ok?

February 8, 2018, 9:14 am
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Part Number: DRV8881

My customer is using the DRV8881 to drive (2) small motors. They have the following question:

"To protect the motors I’ve limited the current to them by changing the sense resistors to 7.5 ohms instead of the other settings.

 

The motors aren’t performing as expected. This could be a motor problem and I’m working towards getting setup to measure the actual current going to them, but figured I would ask if perhaps the DRV8881 has a maximum current sense resistor size? Perhaps too large a value upsets something in the feedback loop and instead I should be adjusting the reference voltage, decay, etc."

Thanks,

Brian

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RE: DRV110: Problems with Input Voltage at 8pin version

February 8, 2018, 10:34 am
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I think I may have found why you measure 0.5V. It looks like when in diode measurement mode the current is flowing back to the supply for me. Can you try disconnecting your supply from P1 and see if you still measure 0.5V? I realized this because the max current my multimeter will put out in diode mode is ~600uA. My resistance between Vin and the supply is 1kohm (R3 turned to 0ohm, R10 = 1k). The voltage I measure in diode mode is 0.6V and when I put an ammeter in series with the supply, when it's turned off, I see that 600uA flowing to the supplies positive terminal.

When I connect my setup, like you with both DRV110 in parallel, and measure the voltage at Vin I measure 14.88 V which is what I expect.

Regards,
Kevin
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DRV110: Problems with Input Voltage at 8pin version

February 8, 2018, 2:59 am
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Part Number: DRV110

Hello TI DRV110 Support,

I have ordered the DRV110 Evaluation Board plus 10 ICs of the 8pin Version of the DRV110. I wanted to test the DRV110 8pin IC, but I can't establish a proper Input voltage unfortunatelly.

When I measure directly with a multimeter in Diode-measurement-mode from Pin Vin to Pin Gnd, I measure round about 0.5V. And thats also the voltage when I connect an external voltage supply with (let's say) 15-20V to pin Vin. I also set a current limiting resistor inbetween, so that's not the problem.

I don't have these problems on the DRV110 Eval board. So I also tried to connect the voltage (V_limit) from the Eval Board to the Vin Pin of the 8pin DRV110. I failed too.

I'm really confused but there must be a possibility with that. Thanks in advance!

Cheers

Thomas

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RE: Motor driver with integrated current control

February 8, 2018, 10:47 am
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Hi Philipp,

Yes, it is typically only for regulating the current but can be used to dynamically control the current.

If you want to dynamically control the current, the VREF input can be changed dynamically.
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RE: Motor driver with integrated current control

February 8, 2018, 11:00 am
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And how do u change the vref inpuf dynamically?
Thanks
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RE: Motor driver with integrated current control

February 8, 2018, 11:22 am
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Hi Philipp,

Please refer to Figures 15 and 16 of the DRV8885 datasheet as an example of how to control the DRV8871 (DRV8885 RREF is similar to DRV8871 ILIM).

For the DRV8870, the VREF can be controlled by a DAC, PWM, or switching resistors in and out.
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Motor driver with integrated current control

January 29, 2018, 6:33 am
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Good Day, we are looking for driving Brushed DC Motors (24V currently, but would work with 12V). The Motor will have currents up to 800mA. The Driver should have internal current control. Is there such an TI Driver?

Thank you very much

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