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DRV8833 Outputs Incorrectly Connected?

October 24, 2016, 10:37 am
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Hello, I am using a product that has DRV8833's installed (I did not design the product), with AOUT and BOUT ganged to double the output current and drive one motor from one DRV8833.  I have been noticing unusual output waveforms from the channels, and when I took the device apart, I see that AOUT1 and AOUT2 are connected, and BOUT1 and BOUT2 are connected-- this is not the way ganging is shown in the datasheet (AOUT1 and BOUT1 are connected, and AOUT2 and BOUT2 are connected).

Could the way this manufacturer designed the product (incorrectly ganging the outputs) be causing the odd waveforms?

Thanks!

--Rob

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DRV8305 continous current

October 24, 2016, 7:55 pm
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Hi,

Does this module support continous 15A without any cooling for hours?

It seems to me that screws and connector are not suitable for 15A on each phase.

Did any one realy tested this module for an hour with Maximum load of 15A?

Thanks,

Roee

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DRV8711 dv/dt and di/dt disturbences

October 25, 2016, 4:34 am
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Greatings! I`m running 6 Nema 17 stepper motors with 6 DRV8711 drivers. I`ve connected IRF530 MOSFETs. My pwm frequency is 4k to 12kHz. The current through the motors is set to 1.44A, 100us OFF, automix decay(I can write down all my settings if it`s necessary ). I`m recieving all driver block after 30-60 min of work instantly. All of them simultaneously. Multiple errors in all stat registers. I suppose the problem is in the power supply, but I want  to be sure. Is there a way dv/dt or di/dt to cause this problems. In high power devices this is possible, but I`m not sure for such small powers. I`m using 12V computer power supply(250W).

Can you give me an advice?

Thanks!

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Reg.DRV8871 Grounding scheme

October 25, 2016, 2:10 pm
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Hi,

I am planning to use DRV8871 in our design for driving the motors. I would like to know few things that need to be taken during the design.

1. How do we make sure noise from does not get into the system? As we are planning to one battery which connects to Motor as well as the micro controller (after down converting it).

2. What kind of ground separation available in the DRV8871 between GND and PGND?

3. If we want to take care outside, what would be the right idea to begin with?

Regards,

Ibram

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In need of an 8-phase stepper motor driver

October 25, 2016, 4:16 pm
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I have two Responsyn HDM-185-2000-8 Stepper motors that drive a 20" telescope.  

The motors specifications are Wiring: 8 phase, 9 wire, Rated Current per phase 0.875 A (Total 3.5 A).

The motor operation provides 4000 steps per revolution in Half Step mode.  

Logic Sequence (CW):

Pin 1 = D!

Pin 6 = B!

Pin 2 = C!

Pin 7 = A!

Pin 3 = D

Pin 8 = B

Pin 4 = C

Pin 9 = A

Pin 5 (power)

 

The Half-Step Sequence:

1.... A C B D..................................

2.........C B D..................................

3.........C B D A!..............................

4.............B D A!..............................

6.............B D A! C!.........................

7.................D A! C! B!......................

8.....................A! C! B!........................

9.....................A! C! B! D!....................

etc.

Does anyone know where I might find one?

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PWM controlled 12V, 0.25A (peak 2A) Motor control Module

October 25, 2016, 4:49 pm
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Hi everyone,

We are building a proof of concept remotely controlled prototype and I would need some external circuitry to control the motors.
At this stage we are going to use cheap motors 12V, 0.25A normal current at roughly 300rpm. (peak current will be somewhere around 2A).
We need some inexpensive module, something similar to this from sparkfun:
www.sparkfun.com/.../9457
I don`t know if TI has anything similar, don`t need any performing hardware at the moment, this model is only meant to be used for monitoring and testing the latency and performance of the remote control.
Thanks

Claudio

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Why is does the motor spin at twice the specified/indicated speed?

October 25, 2016, 5:20 pm
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I am getting started with a F28017F Launchpad with a DRV8301 Booster Pack. I am working through the labs in the InstaSpin Projects and Labs User’s Guide. I have the gMotorVars.SpeedRef_krpm set to 0.160. When I enable the system, the indicated speed (gMotorVars.Speed_krpm) closely matches this value. However, when I use an Extech Tachometer I measure the motor speed at 320 RPM. I am using an Anaheim motors BLWS232D_24V_4000 motor. My motor parameters from the user.h file are

#define USER_MOTOR_TYPE                 MOTOR_Type_Pm  

#define USER_MOTOR_NUM_POLE_PAIRS       (4)            

#define USER_MOTOR_Rr                   (NULL)         

#define USER_MOTOR_Rs                   (0.4221607)    

#define USER_MOTOR_Ls_d                 (0.001263413)  

#define USER_MOTOR_Ls_q                 (0.001263413)  

#define USER_MOTOR_RATED_FLUX           (0.07853003)        

#define USER_MOTOR_MAGNETIZING_CURRENT  (NULL)         

#define USER_MOTOR_RES_EST_CURRENT      (1.0)          

#define USER_MOTOR_IND_EST_CURRENT      (-1.0)        

#define USER_MOTOR_MAX_CURRENT          (3.0)         

#define USER_MOTOR_FLUX_EST_FREQ_Hz     (20.0)         

 

Am I making a rookie mistake?

 

Thanks

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code evaldrv8711

October 26, 2016, 12:34 am
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It's possible to have a more detailed explanation of the task 0  of   code evaldrv8711?
In the program I do not understand why it is used dacconverter , if  in schematic  the  tracks  of  dac is not connected to anything.
Thank you

            break;
// DAC 0 Config and Write [ OPCODE = 5 ] [ Config HB ] [ Config LB ] [ Data HB ] [ Data LB ]
      case (DAC0_UPDATE):
            DAC12_0CTL = 0;
            DAC12_0CTL = (SerialBuffer[1] * 256) + SerialBuffer[2];
            DAC12_0DAT = (SerialBuffer[3] * 256) + SerialBuffer[4];
            break;
// DAC 1 Config and Write [ OPCODE = 6 ] [ Config HB ] [ Config LB ] [ Data HB ] [ Data LB ]
      case (DAC1_UPDATE):
            DAC12_1CTL = 0;
            DAC12_1CTL = (SerialBuffer[1] * 256) + SerialBuffer[2];
            DAC12_1DAT = (SerialBuffer[3] * 256) + SerialBuffer[4];
            break;

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DRV8308 : Problem in using ADVANCE feature

October 26, 2016, 5:55 am
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Hi,

I am using DRV8308 EVM board to run a motor. Motor runs fine in CW direction with default settings and value of ADVANCE reg=157. With this setting motor is not rotating properly in CCW direction. It rotates for few seconds with high current ,vibrations and noise then stops. If I change value of DELAY from 0 to 1, with ADVANCE reg=157, motor rotates in CCW but in CW direction motor rotates for few seconds with high current ,vibrations and noise then stops which is reverse of previous case when DELAY=0. All other settings are default settings, I have not changed any other settings. Please suggest what might be issue for this behavior. I need single setting where motor works efficiently in CW and CCW direction.

regards,

Pooja Mishra

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DRV8313 Starting Time for 3.3V Internal Regulator

October 26, 2016, 9:09 pm
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Hi,

How many seconds does the V3P3 voltage which the internal regulator outputs become stable in after applying the VM power supply ?
Could you please give us your advice since we need to control DRV8313 via the GPIO ?

Best regards,
Kato

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The full-scale (100%) chopping current setting of DRV8880

October 27, 2016, 1:39 am
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Dear Motor support team,

I set the IFS to be 2.0A maximum peak current with 3.3V Vref,  250*10^-3ohm Rsens and 100% TRQ setting.

I confirmed IFS setting with P.18 in www.ti.com/.../drv8880.pdf.

However I observed about 1.4A peak current at 800pps and 1.17A  at 3000pps respectively.

Why I can not obtain 2.0A peak current in this conditions?

Please confirm the attached file.

Yohjiro Kawai,

(Please visit the site to view this file)

 

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DRV10983 motor current limit

October 27, 2016, 8:19 am
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Hi Champs,

Do we have issue running motors below a certain current limit? The “no motor fault” is triggered at a phase current below 140mA does that mean that we can run into some limitation below that value?

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type of motor in the DRV8301 LS31 Kit

October 27, 2016, 1:37 pm
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Issue with DRV8313 Evaluation Module Software

October 28, 2016, 3:27 am
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The software has abruptly started giving error. A pop-up screen shows following information while we try to connect the EVM

Member: .Name

Function: GetValue

Error In: InternalInvokeV

Error: Type mismatch.

Code: 80020005

Source: Application

Please advice

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DRV10983 and drv8313 ti application software not compatible with windows 8 and 10

October 28, 2016, 4:25 am
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why DRV10983 application software is not compatible with windows 8 and 10.

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BOOST-DRV8711A won't drive

October 28, 2016, 8:35 am
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I have a pair of BOOST-DRV8711A boards connected to MSP-430G2EXPs, as specified in the user guide. They're programmed and happy (CCS 6.2, GUI tool 6.0) and communicating. I'm only trying to use one at a time right now. I've got indications that the GUI is talking to the 8711, in the form of monitoring registers and apparently getting live feedback, but I have zero spin on my motors. Both motors under test are known good units, one likes 3.5Apk (2.8ARMS), one likes 2.5APk (1.75ARMS). Both should be well within the capabilities of the board, and both are well within the capabilities of my 24V 8A supply (which is staying nice and stable at 24.12VDC the whole time). Activating a start/stop profile or a step# profile produces a lack of output. No voltage switching is occurring on the outputs of the DRV8711, and no reluctance can be perceived on the motor shaft from applied power. 

Here's what the setup looks like:

I've tried every manner of reset I can think of with negative improvement. I just want my motor to spin!

Help?

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I2C pwm generator ic

October 28, 2016, 12:21 pm
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Can someone recommend a dual-output pwm generator ic with I2C communication producing 20 Hz-10 kHz frequency and 0% to 100% duty cycle, 3.3V supply? Application is a solenoid driver using DRV8840/8842 driver chip. The design has 10 channels and want to simplify the microcontroller code.

Jeff Stepp

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Difference between R12 and R13 labels on the DRV8312EVM RevD and the schematic provided in controlsuite

October 28, 2016, 4:31 pm
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Good Day,

I recently bought a DRV8312-c2-kit and i was looking at the VDCBUS connection to the adc-b2 pin. Connected to the VDCBUS line is a connection from PVDD through a voltage divider created by R12 and R13. When comparing the positions of  the 2 resistors with the schematic provided in controlsuite"DRV8312EVM_RevD_Schematic" the positions of the 2 resistors are interchanged. I proceeded to perform a continuity test on the board and this showed that R12 is connected to GND and R13 is connected to PVDD. Again the schematic says the opposite. Can someone please inform me of what the correct arrangement is and what the resistor values are supposed to be for each of the resistors.

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DRV8312, nothing but FAULTs

October 29, 2016, 9:12 pm
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Hello,

Recently produced a prototype that uses the DRV8312 to drive a sensored BLDC motor. I'm having an issue where any time I try to drive any of the motor phases, both the OTW and FAULT lines fire off immediately and disable the device. I have checked for any shorts to ground and can not locate any. The OTW fault is especially peculiar, as the device is just at room temperature. Does anyone have any ideas? Is my chip dead? This is the second one I have installed with the same issue. I've read the datasheet through several times and I can't find any issues with my schematic that would cause this behavior. These faults occur even with the load disconnected. There is 12V present on all power pins, and 3.3V at VREG. The motor does not spin at all, only a faint click before the FAULTs trip.

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drv8302

October 30, 2016, 4:28 am
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Iam using drv8302 to run the BLDC motor.When i run the motor without any load the current in the drv8302 is about 4.8mA but as i increase the load on the motor the current in the drv8302 increases.It goes to 8mA when my motor current is 12A.

Is it a normal behaviour of drv8302 or something is wrong??

And what is the maximum current is allowed in the drnv8302 in proper working conditions??

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