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DRV8302: Gate drive troubleshooting

April 25, 2018, 3:50 pm
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Still having similar issues. Is it ok to post to my topic - or should I open new one?

I'm not sure - I am examining the operation of gate driver without mosfets beeing connected (let alone motors). I soldered new DRV8203 chip. I see that for small time (250ns) both GH_A and GL_A are ON.

GH_A is approx 11V

GH_B is approx 8V

Would this be same with mosfets in place? Having GND and 24V on phase_A shorted is not good thing right? What I am missing here?

[View:https://photos.app.goo.gl/0gFeX8WiMBYCRZ9I3:1230:0]

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RE: BOOSTXL-DRV8301: Control Register 1 resets to 0, and motor stops spinning

April 26, 2018, 12:46 pm
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Sanmesh,

If motor is not connected, and all the phases go to Vdc, my guess is that the GHx pins are all driving high, and the GLx pins are all driving low. If that is the case, then the INHx pins must be high and the INLx pins must be low. Can you check if this is the case?

Also, can you run the software in debug mode and pause it/step through it to see if it is stuck in some subroutine that puts the motor driver in that state?
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RE: DRV8884: Looking for a 6phase half step driver; not this 8 phase half step driver.

April 26, 2018, 12:59 pm
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Hi Ken,

It does not appear our BLDC controllers are set up for the sequence of the motor. Even it it was, external circuitry to control the 3 phase inputs would be required.

The DRV8834 using CONFIG set low is the closest match. The two windings can be controlled separately using the xPHASE/xENBL inputs.
The components shown around the DRV8834 in the block diagram can be minimized for this application.
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RE: DRV8323R: PWM input mode etc. Need Reference design for FOC mode using DRV8323RS 3x PWM

April 27, 2018, 7:07 am
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DRV8323R: PWM input mode etc. Need Reference design for FOC mode using DRV8323RS 3x PWM

April 27, 2018, 6:43 am
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Part Number: DRV8323R

I was wondering if TI or any other users have a design using the DRV8323RS or similar inField Oriented Control Mode (FOC)

Specifically I need information of how to connect the INHx and INLx in the 3x PWM mode. 

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RE: DRV110: Keep voltage not discharging with disable of DRV110

April 27, 2018, 7:11 am
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Hi Madhu Chandra K,

That is very odd. Are R292, R293, and C78 still populated on the board?

Can you use an oscilloscope to capture the MOSFET's source voltage? If you have a current probe, can you capture the solenoid's current? Please post the waveforms here when you have captured them.

Best,

Grant

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DRV110: Keep voltage not discharging with disable of DRV110

April 10, 2018, 1:28 am
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Part Number: DRV110

Driving of solenoid is one of the requirement of our project. Earlier this was driven through linear circuitry where power dissipation was more. Hence to reduce the power we went ahead designing with DRV110 and the same is realised as part of our PCB along with linear drive circuitry as redundant.

One of the problem which I am facing is that the keep voltage (100mV) is not discharging to zero after the chip is disabled (using enable pin). I think because of this, pull-in current is not working for every enable of the chip whereas hold-in is fine always.

Request your inputs in this regard.

I have attached the details of our requirement, solenoid specification and the schematics (most of the design is from your evaluation board) for your reference.[View:/cfs-file/__key/communityserver-discussions-components-files/38/PRIMARY-_5F00_-22.pdf:1230:0]

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TINA/Spice/DRV8814: TINA-TI Transient Model

April 27, 2018, 7:34 am
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Part Number: DRV8814

Tool/software: TINA-TI or Spice Models

I'm trying to import the provided Transient Spice model into TINA-TI and I keep getting the following error.

Do we have a model for this device that is compatible with Tina?  If not, what would it take to get one?

Thanks,

Stuart

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RE: DRV8834: VREFO bypass cap

April 27, 2018, 7:44 am
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The part is MCP4726 and it specs input current 210uA typ, 400uA max with the buffered input mode. No buffer, same with additional spec of 210kΩ/29pF input impedance. We've been using it in buffered mode.
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RE: CCS/DRV3205EVM: Why is the rising edge of the current triggered in the middle of the non-abc three-phase PWM?

April 27, 2018, 8:07 am
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Hello Feng,

Could you please explain what you were attempting to do with the EVM when you captured this waveform, and what the issue you are observing is? I don't really understand what the question you are asking is in the original post?

Thanks,
Garrett
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RE: BOOSTXL-DRV8301: Control Register 1 resets to 0, and motor stops spinning

April 27, 2018, 8:28 am
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I measured the PWM_AH,BH,CH, pins on the boostxl-DRV8301, which are directly connected to the INH_A,B,C pins, and see the pwm waveform below when putting an oscilloscope low pass filter on the signal. The INL_A,B,C pins were ground as expected.

However, the  GHx pins are all at almost dc level, and the GLx pins are GND.

Thus, something tells the drv8301 to ignore the INH/L input and just send constant dc voltage on GHx pins. What could this be?

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RE: DRV8834: VREFO bypass cap

April 27, 2018, 8:43 am
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Hi Marc,

Thank you for the confirmation of the resistor divider DAC. The maximum current on the VREF pin is 40uA, so there should no problem there.

The capacitor on the VREFO pin should be removed.
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RE: BOOSTXL-DRV8301: Control Register 1 resets to 0, and motor stops spinning

April 27, 2018, 9:04 am
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Also, about your question on checking whether the code is stuck in some subroutine, seeing the pwm signal go to the INx pins of the DRV8301 I think proves that the code isn't stuck in some subroutine, and I have also checked myself through running in debug mode.

What I'd like is for you to list cases where the device would reset its configuration register or output all three GHx pins as high Vdc signals.
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RE: DRV10975EVM: Gerber file

April 27, 2018, 9:05 am
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Brian,

We don't have a DRV10975RHF EVM publicly released. For functional evaluation purposes our customers can just use the DRV10975PWPR EVM.

Please help verify the resolution to this thread. Thank you.

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DRV10975EVM: Gerber file

April 26, 2018, 9:08 pm
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Part Number: DRV10975EVM

Hi, could you offer the gerber file of the DRV10975RHF EVM?

Thanks.

Brian

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RE: DRV10975: Current limit

April 27, 2018, 9:18 am
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Pok Man,
I've assigned this thread to our support expert to help you. Before that person gets back to you, I have a few questions:
1. What are you trying to accomplish with this motor in your model car? Moving the wheels?
2. How much current do you need? You mentioned you're using a 12V, 0.2A DC supply; is the current the motor needs less than 0.2A?
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DRV10975: Current limit

April 27, 2018, 12:00 am
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Part Number: DRV10975

I had set the lock detection current threshold to maximum, which is 0x0F to EEPROM 0x28. However, the supply current could not be above 0.2A with 12V DC supply. I applied some load on the motor and it stopped. I read the fault code and only Lock Detection Current Limit is detected.(read 0x01 in register 0x1E). The motor can enter Close Loop.

Also, I am planning to use the IC to control the motor of  a model car(very light in weight, approx. 500g). Doe this IC fit my need? 

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RE: BOOSTXL-DRV8301: Control Register 1 resets to 0, and motor stops spinning

April 27, 2018, 9:27 am
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Sanmesh,

I'm looking into that right now. Can you please let me know the voltage on all the GHx and GLx pins when the device is in the unresponsive state with the 379D board? My guess is that the GHx pins are high and the GLx pins are low, but I want to confirm.

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RE: BOOSTXL-DRV8301: Control Register 1 resets to 0, and motor stops spinning

April 27, 2018, 10:04 am
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Here is some info from the DRV8301 datasheet that might help debug.

UVLO (maybe not your issue since SPI shuts down)

A specific PVDD1 undervoltage transient brownout from 13 µs to 15 µs can cause the DRV8301 to become unresponsive to external inputs until a full power cycle. The transient condition consists of having PVDD1 greater than the PVDD_UV level and then PVDD1 dropping below the PVDD_UV level for a specific period of 13 µs to 15 µs. Transients shorter or longer than 13 to 15 µs will not affect the normal operation of the undervoltage protection. Additional bulk capacitance can be added to PVDD1 to reduce undervoltage transients.

EN_GATE transients

An EN_GATE reset pulse (high → low → high) from 10 to 20 µs should not be applied to the EN_GATE pin. The DRV8301 has a transition area from the quick to full reset modes that can cause the device to become unresponsive to external inputs until a full power cycle. An RC filter can be added externally to the pin if reset pulses with this period are expected to occur on the EN_GATE pin.

Gate Driver Power-Up Sequencing Errata

The DRV8301 gate drivers may not correctly power up if a voltage greater than 8.5 V is present on any SH_X pin when EN_GATE is brought logic high (device enabled) after PVDD1 power is applied (PVDD1 > PVDD_UV). This sequence should be avoided by ensuring the voltage levels on the SH_X pins are less than 8.5 V when the DRV8301 is enabled through EN_GATE.

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RE: BOOSTXL-DRV8301: Control Register 1 resets to 0, and motor stops spinning

April 27, 2018, 10:33 am
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GHx pins are 17V, with Vdc = 20V. GLx pins are 0V.

I think the noise on the EN_Gate pin is causing the issue. I put an oscilloscope signal on the EN_GATE pin, and set the capture mode to trigger when voltage is below 2.7V. When I detect the config reg1 reset to 0, the scope triggers on the capture below, with YELLOW channel = EN_GATE, and Blue channel = INH. The voltage goes as below as 2.329V.

There are three things to note:

1) DRV8301 boosterpack works on 377S launchpad, but not 379D launchpad

2) Using 379D launchpad with the DRV8305 boosterpack which has the same EN_Gate pin, works properly, and I don't see EN_GATE going below 2.9V at any time.

3) Problem occurs when both the motor is connected and disconnected, but happens more often whe the motor is connected.

Using these 3 facts, I think for some reason, the DRV8301 boosterpack has issues supplying enough current to the 379D launchpad, and its a board compatibility issue. Is this a correct deduction and would you recommend anything else?

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