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DRV8825: 40 ohms between V3P3OUT and GND

January 27, 2019, 7:43 am
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Part Number: DRV8825

I was buzzing out a new PCB in which the DRV8825 is the main IC. I noticed that I had a "short" between the V3P3OUT and gnd so I remove the bypass cap and still had this short of ~ 40ohms. I then tested pins 28 and 15 on an unsoldered chip and noticed the ground existed in both red to V3P3OUT and black to V3P3OUT. Should this be expected as its not in the datasheet ?

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RE: DRV8704: DRV8704 Overvoltage

January 29, 2019, 3:34 pm
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Hi Mickaël,

I have searched and not found an application note or reference circuit.

Using Zener diodes should work in your application. As you mentioned, determining the power dissipation will be key. Have you contacted the motor manufacturer for assistance?
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DRV8704: DRV8704 Overvoltage

January 14, 2019, 1:37 am
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Part Number: DRV8704

Hello,

We designed a custom board using the DRV8704. The system drives a platform inside a water tank. The platform goes down by activating the motors and goes up with Archimedes' buoyancy. When the platform goes up the Archimedes' buoyancy is regulated by the motors to control the platform speed. The motors are powered by 24V power supply.

When the platform goes up the motors are generating voltage. During one test the DRV8704 "burned", the pin AOUT1 seems to have melted.

A second failure (on another board) melted the AOUT2 pin and transistor connected to B2HS and B2LS burned.


I would like to protect the xOUTy pins.
Here are my questions :
What is the purpose of xOUTy pins ?
Is there a way to protect them from over-voltage ?
Is there a better component to drive motor as actuator and generator ?

Kind regards,

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RE: 1xPWM mode logic check please...

January 29, 2019, 4:07 pm
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1xPWM mode logic check please...

January 10, 2019, 11:12 pm
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Hi,

I open new thread, because the original thread is locked.

Could you check the logic using 1xPWM mode with DRV8323RH?

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RE: DRV10964: Search for FAN controller

January 29, 2019, 4:13 pm
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Hey Naoki-san,

I have checked with out marketing team, and on the motor drives side, we dont have a replacement part. I was told to suggest the MSP430 as it is low-cost and fulfills the function of the MAX31790. Please follow my advice in my above post regarding the msp430.

Let me know if you have any more questions. Otherwise, please check the TI thinks resolved button.

Sincerely,
Sanmesh U.

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RE: DRV10964: Search for FAN controller

January 29, 2019, 4:30 pm
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Hi Sanmesh-san,

Thank you for your checking.
I will offer the customer to use the MSP430.

Thanks,
Naoki Aoyama
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DRV10964: Search for FAN controller

January 27, 2019, 6:46 pm
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Part Number: DRV10964

Hello,

Our customer are searching for FAN controller. They use the MAX31790, now.

They are considering replacement the parts.

Do you have any recommend parts?

Best Regards,

Naoki Aoyama

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RE: DRV8873: DRV8873 with 200kHz PWM frequency

January 29, 2019, 6:38 pm
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Philipp,

e2e is not good for the road map discussion. I got your e2e message. Let me close this post.
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DRV8873: DRV8873 with 200kHz PWM frequency

January 17, 2019, 12:50 am
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Part Number: DRV8873

Hello TI!

What is the Roadmap of TI's DC Motor Drivers?
Is there a future product like the DRV8873 with a maximum PWM frequency of 200 kHz?

Best reagrds

Philipp Schneider

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RE: DRV8323: Driving Parallel-Connected MOSFETs

January 29, 2019, 10:27 pm
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Dear Adam,

Thank you very much for your quick reply, it is highly appreciated. Regarding your recommendations, I'd like to ask you a couple more questions:

  1. Is the goal of using external gate resistors, which I understand are not needed in a Smart Drive system driving only one Mosfet, balancing the current between both semiconductors? (i.e., compensating for differences in their internal resistances).
  2. Is there a maximum resistor value that needs to be considered in order not to saturate the current sources of the driver?
  3. By adding an external resistor, the Gate-to-Source voltage measured by the driver will no longer be the actual Gate-to-Source voltage of the Mosfets. The measured voltage will fall/rise way quicker than the actual one at the semiconductor terminals. Could this have a negative impact in the "Handshake" part of the Tdrive state machine? (i.e. the driver will consider the semiconductor to be on /off when it isn't). Are there any particular recommendations to compensate for this effect?
  4. Is the use of external Gate-to-Source caps also recommended?

Best regards,

Cristián

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DRV8801A-Q1: supply voltage, no power,

January 29, 2019, 10:57 pm
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Hi~

During the production, customer want to test motor without board power supplied.

It means, after SMD, they just want to test motor by supplying +12V at OUTA/OUTB without supplying power at VBB.

Absolute max rating looks no problem, but should I concern other things? surge, damage internal something?

Let me have your opinion if has no problem or not.

Thanks.

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DRV8894 the register of sense signal for the transfer

January 29, 2019, 11:36 pm
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Hi all

Would you mind if we ask DRV8894?

<Question1>
In case of SXLD=Low, logic level of SSOUT and SP1 are the same.
Is it correct operation?

<Question2>
In relation to <Question1>, if this is correct operation, why will SSOUT and SP1 become the same logic level?
Our customer would like to know internal operating principles.
We could not find these contents on the datasheet.
Especially there is no truth table and timing chart.

Kind regards,

Hirotaka Matsumoto

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RE: DRV11873: DRV11873

January 29, 2019, 11:50 pm
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1:

A) PWMIN has always existed.

B) the failure phenomenon of pulling up to 5V on FG and RD remains the same.

C) the RD did change from low to high. Indeed, the chip detected a fault and started the drive again after 5 seconds.

2:

After the PWM signal was input, the chip tried to drive the motor and applied voltage, but the motor did not move.

In the case of no interference from the transmitting coil of wireless power supply, the chip ignored PWM signal at startup and was driven by dc, and 10 phase changes were measured. PWM signal at the 11th phase change was intervened.

When there is a wireless transmitter coil interference, chip attempts to drive motor, can be seen when the third phase PWM signal, the signal frequency is about 60 k, our wireless power supply is also on this frequency, should be a motor coil induction power supply for wireless transmitter coil magnetic field, the chip to drive the motor when the two parties work produced interference at the same time.Tank you!

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DRV11873: DRV11873

January 22, 2019, 2:40 am
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Part Number: DRV11873

Hi Team,

we use DRV11873 to drive the permanent magnet dc micromotor, and we add the function of wireless charging in the middle of the motor, as shown in the figure below.

1: the fault phenomenon is that the dc motor cannot work normally when the power is supplied, and there is no voltage in U/V/W, so the test waveform is shown in the figure below.

If we remove the wireless charging function, the motor will work normally. How can the magnetic field affect the normal work of DRV11873? Thank you!

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RE: DRV8308: Any non-admin GUI for DRV8308

January 30, 2019, 12:58 am
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Hi Adam,

Is there a package we run the GUI without directly install on the PC? A standalone software or so?

The customer continues to see an issue while setting up when it comes to the GUI composer runtime, we are suspecting that this may be due to admin rights or etc... But this may take quite awhile to resolved with the IT.

Thanks,
Christina
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DRV8308: Any non-admin GUI for DRV8308

January 28, 2019, 2:26 am
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Part Number: DRV8308

Hi,

Are there any alternative GUI support for DRV8308 GUI? Some customer is having admin right issue while trying to download the "GUI run-time" from: [View:http://www.ti.com/tool/DRV8308EVM:1230:0]

Thanks,

Christina

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DRV8860: Datasheet Mistake?

January 25, 2019, 9:35 am
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Part Number: DRV8860

Hello,

Looking at the DRV8860 datasheet (page 12) for the daisy-chain configuration, it says

“Two or more DRV8860 devices may be connected together to use a single serial interface. The SDATOUT pin of the first device in the chain is connected to the SDATIN pin of the next device. The SCLK, LATCH, RESET, and nFAULT pins are connected together.”

Here most of these pins do not exist (SDATOUT,SDATIN, RESET) for this part, and looks like this is from one of the other DRV88xx datasheets. 

For the daisy-chain configuration are nFault and Enable pins connected together?

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RE: DRV8711: Current regulation

January 30, 2019, 9:40 am
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Nagata,

1. dv=L*di/dt; In this case, L is winding inductance; dt is tBlANK; di is the winding current increasing value in tBLANK; dv is the voltage across the motor winding. If you want to regulate the current at 0.52A, you have to make sure the di<0.52A in tBLANK because the part cannot sense the current in tBLANK.
2. Measure or calculate (dv=L*di/dt) the winding current in tBLANK. If the peak current at tBLANK is higher than the current regulation point, that means the winding inductance is small to limit the current in tBLANK.
3. Please try to reduce tBLANK first.
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DRV8711: Current regulation

January 25, 2019, 2:42 am
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Part Number: DRV8711

Hi, team,

Could you please give me your advice how to set current regulation value?

I use Full-scale current(IFS) formula x 71% (home state). But the measurement current is larger than calculation. It's depend on VM.
And when I change the motor, measurement current is increased.

Is my calculation correct? If it is incorrect, could you please give me advice how to calculate current regulation through VM=12 to 35V and dependency of Coil register? IFS formula doesn't have VM value and Coil register....

Here is test condition and result

[View:/cfs-file/__key/communityserver-discussions-components-files/38/DRV8711_5F00_test-condition_2600_measurement.xlsx:1230:0]

Regards,

Nagata.

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