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RE: CCS/DRV8886EVM: Need a motor driver demo board which can be programmed using Code Composer Studio.

May 1, 2018, 6:25 am
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CCS/DRV8886EVM: Need a motor driver demo board which can be programmed using Code Composer Studio.

April 30, 2018, 8:34 pm
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Part Number: DRV8886EVM

Tool/software: Code Composer Studio

I like the DRV8886 evaluation module, but it does not seem to be programmable like the MSP432 Launchpad board I have. I know I can add a booster pack to my Launchpad, but I was wondering if there was a motor driver board with a programmable MCU that I can program myself. I really don't care which MCU is used, I only need a 2amp board to give a demo. So, the requirements would be as follows:

1. 2.0Amp Stepper output

2. Programmable flash just like the LaunchPad using CCS.

3. Serial interface so I can communicate with the board while the code is running (IE send stepper commands that I create).

4. Preferably a single board solution with minimal footprint as I need to impress my manager with a simple space saving solution.

Thanks,

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RE: DRV8821: Over-Current Threshold

May 1, 2018, 7:54 am
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Hi Lance,

Sorry for the delay.

"I surmise that the DRV8821 compensates for this overdrive by adjusting the step timing, but perhaps you can better answer how the DRV8821 would respond to this. The winding current waveform changes as the maximum frequency is approached. There is no longer a step in current and the current is ramping at the maximum to reach the required regulation point."

The DRV8821 does not adjust the step timing. The DRV8821 attempts to drive to the desired current level.

If the desired current level is reached between step pulses, the DRV8821 will begin regulating. If the desired current is not reached when the next step pulse is sent, the DRV8821 will attempt to drive to the new level.
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DRV8821: Over-Current Threshold

April 20, 2018, 1:14 pm
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Part Number: DRV8821

I'm inheriting a card design using the DRV8821 motor driver to open and close a door. The design delivers 1.5A per winding which goes right up against the 1.5A peak threshold and occasionally trips the OCP. I guess this is no surprise, but the range of current limit is 1.5A to 4.5A, so I would not expect to see a trip typically. I have since increased the sense resistor from 0.28-Ohms to 0.36-Ohms and that has fixed the OCP trip. However, under the original design i'm seeing a dip in the winding current that I would like an explanation. The initial programmed current is correct, but then after ~1s, the current ramps down to a lower level. What in the DRV8821 is dropping the current? Some pictures and schematics are attached.

Note that the following picture monitors the motor winding currents with current probes as this was an easier measurement to make.

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RE: DRV10987: TIDA-01493

May 1, 2018, 10:06 am
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Hello Shlomi,

The TIDA-01493 does not come with or need source code. The software linked in the TIDA-01493 is the DRV10xx GUI Software which helps users tune and enable the DRV10987’s configuration settings.

Usually this software is used in context of the DRV10987EVM however, it has been linked here for ease of access.

Best,
-Cole
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DRV10987: TIDA-01493

May 1, 2018, 7:16 am
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Part Number: DRV10987

Hi Team,

I found TIDA-01493 - Thermally optimized 2-Layer 60-W Sensorless BLDC Motor Drive Reference Design:

http://www.ti.com/tool/TIDA-01493

I download the software from this link but I get the EVM exe again.

Can't find the example code there.

Can you share the source code of the TIDA-01493?

Thanks,

Shlomi

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DRV10983-Q1: Design of closed-loop speed control

May 1, 2018, 1:12 pm
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Part Number: DRV10983-Q1

Hi, can you help me with this?

I am trying to design a closed-loop speed control for a 3 phase motor, 36 pole coils, with the DRV10983. But I can even find information abut how to use the PIN #12 to enabled and program the driver. Just some videos telling that is possible

Can you help me to get more information about this?

Thanks in advance!

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RE: DRV8302: Gate drive troubleshooting

May 1, 2018, 1:19 pm
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Zhivko,

It looks like you are measuring right at the FET gate. You might be experiencing shoot-through due to impedance between the gate drive output and your FET gate. Even though our device tries to protect from shoot-through, the chip will "think" that the FET is off, but the FET is not fully turned off because the gate hasn't fully discharged. My picture below shows a modified test setup to help confirm this. If you probe at the device GHA pin and at the FET gate, I expect to see two different signals.

From the schematic you posted on the previous post, I saw that you have some resistors in the gate drive path that impact the way the gate discharges. One thing you can do is remove the gate-to-ground resistor and make the resistor in the gate-drive path 0-ohm. This should solve the problem, however, you may want to check to make sure the overshoot/undershoot voltage on the gate drive trace is acceptable for the DRV8302 and the FETs your are using. This overshoot/undershoot comes from package and trace parasitics.

If possible in future layout revisions, keep the traces between the gate drive outputs and the FET gates as short as possible.

If you want to leave the resistors in the circuit, follow the guidelines in the app note Fundamentals of MOSFET and IGBT Gate Driver Circuits. R_GATE is calculated on page 15. You can put a diode in parallel with it (section 3.4.1). Designing the Rgs resistor is described in section 3.5.

Because the INxx pins have internal pull-down resistors, you can leave the unused ones unconnected.

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DRV8305: Need suggestion for off the shelf Driver Kit + BLDC for large current operation

May 1, 2018, 6:16 pm
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Part Number: DRV8305

HI,

I am working on a hands-on demo showing the current waveforms in BLDC operation and need an off the shelf solution for this. I am looking for a motor driver eval kit + a BLDC motor. The BLDC should be carrying currents as large as 10-20A so that I can pick it up and display easily with current probes.

I came across the following reference design that works with the Electrocraft (RP34-313V24-100) motor. 

www.ti.com/.../tidubp9.pdf

However, this design PCB needs to be fabbed and assembled. Is there a suitable recommendation for an already built and assembled demo kit that can meet my requirements.

Thanks 

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RE: CCS/DRV8886EVM: Need a motor driver demo board which can be programmed using Code Composer Studio.

May 1, 2018, 8:58 pm
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The idea is to send commands to the board via the serial interface. For starters I would create a GUI in Windows or Linux and send serial commands such as "/1A1000R" to move to an absolute position (Hyperterminal would also work). The code needs to be downloaded to the flash memory as I can't have the emulator attached when I run the code. The end game here is to design a custom PCB using an FPGA or MPU to control various stepper drivers. First step, however, is to demonstrate that simple code can be written to receive a few serial port commands from a host PC and translate each command into signals which can drive a stepper motor.

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DRV3205-Q1: Electric Power Steering Design Guide With DRV3205-Q1

May 1, 2018, 10:57 pm
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Part Number: DRV3205-Q1

Dear,


our clinet want to Design EPS system, we find the Application Report SLVA830,  and Interfacing TPS65381 With Hercules™ Microcontrollers TMS570 for reference.


how ever, have as below chart to complete schemtic for our reference TI design.


If any, Please advise me.


Thanks,


Best regards,


Lawrence.

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RE: DRV8302: Gate drive troubleshooting

May 2, 2018, 4:02 am
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Hi James,

Yes you are right I have resistor on gate of high mosfet. Unfortunately I dont have 3 probes to take 3 scope shots at same time like you proposed, but I have only 2 probes.
Here is scope picture on drv8302 side of this resistor (yellow) and mosfet gate signal picture (blue).

I still don't know how come that both gates are on at same time? (I made scope pictures in previous post - is it possible to know why?

The funny thing is that at some duty I don't get output on GH_A and GL_A - at some duty this signals are kind of floating - I made video to better show pwm duty (at 24kHz) - what could be the reason?

This is video of INH_A (blue) and GH_A (yellow)

and video of INL_A (blue) and GH_A (yellow)

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RE: CCS/DRV8886EVM: Need a motor driver demo board which can be programmed using Code Composer Studio.

May 2, 2018, 5:44 am
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Hi Jim,

The emulator was used for debug and then programming. Once programmed, the emulator is not needed.

The EVM allows you to control the DRV8886 with the mcu and code provided, re-program the mcu, or wire in your own control.

If you plan to use a mcu, there are energia libraries available that should help you get started. Good luck.
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RE: DRV8305: Need suggestion for off the shelf Driver Kit + BLDC for large current operation

May 2, 2018, 5:46 am
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Position transitions with SpainTAC Move

May 2, 2018, 6:41 am
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Good day!

Thanks to TI, I Have a great time controlling my servo motor :).

I worked with this function:

STPOSMOVE_setPositionStep_mrev(stObj->posMoveHandle, gMotorVars.PosStepInt_MRev, gMotorVars.PosStepFrac_MRev);
I have to set PosStepInt_MRev , PosStepFrac_MRev to go to my target position,

Now, I like to work by Pulse and Direction Like all of Servo drives.

would you please tell me how I can run servo motor in position mode by Pulse and Direction instead of " PosStepInt_MRev , PosStepFrac_MRev "

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RE: RTOS: DRV91690

May 2, 2018, 7:29 am
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The DRV91690 has an integrated MCU based on the MSP430F543xA/MSP430F541xA. Please review the documents in the SDK and latest the datasheet from your FAE team. 

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RTOS: DRV91690

May 2, 2018, 2:55 am
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Tool/software: TI-RTOS

Do I need a MCU control the DRV91690

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RE: DRV8305: Need suggestion for off the shelf Driver Kit + BLDC for large current operation

May 2, 2018, 10:25 am
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RE: DRV8320: PWM Mode Issues

May 2, 2018, 10:39 am
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Hi i dint get any reply from the team. Waiting for your response.
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RE: DRV8320: PWM Mode Issues

May 2, 2018, 11:47 am
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Hi Navin,
I apologize for the delayed response. The thermal pad to is not optional and it must be connected to ground, this might be related to the thermal issue you are experiencing.
What is the voltage level at your mode pin? Could it be possible that you are not on the correct mode?
Does the device report a fault at any given time? if so, under what conditions?
Also, our EVM and GUI is a good option to start evaluation. From there, you could observe the differences between the signals provided to the device versus your setup. Thank you.
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