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RE: DRV8841: Why DRV8871 is not suitable for solenoid driving

November 25, 2017, 8:10 am
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Hi kpk,

We will investigate and reply soon.

How do you intend to drive the solenoid? (enable the ouputs on with no current regulation, enable the outputs with current regulation, or PWM the inputs at high frequency) If PWM at high frequency, what duty cycles would be used?
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DRV8841: Why DRV8871 is not suitable for solenoid driving

November 25, 2017, 7:37 am
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Part Number: DRV8841

Dear Sir/Madam,

When looking at TI motor control brochures, I noticed that it mentioned DRV8841/8842 is suitable for solenoid driving but DRV8871 is not. Why is the reason?

my end application is for safety device, and PCB size is small. So reluctance to use DRV8841/8842  although they are good however the size is quite big. What would be the pros and cons if I use DRV8871/72 for driving solenoid?

 

Best Regards,

kpk

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DRV8881EEVM: Issue of GUI install(Runtime)

November 26, 2017, 5:04 pm
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Part Number: DRV8881EEVM

Hi,

I can't install GUI for DRV8881EEVM.
When I install GUI for DRV8881EEVM, PC shows below error message.
What is the cause of this issue?

Best regards,
Shimizu

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DRV3205-Q1: Recommended operating supply voltage vs absolute maximum rating

November 12, 2017, 10:10 pm
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Part Number: DRV3205-Q1

Hi,

This question is with respect to DRV3205 voltage rating. 

Absolute Maximum VSH and VS is 60V and recommended operating supply voltage is 40V.

If we have 36V DC rail and we do expect some swings on its DC rail which may go above 40V momentarily.

Does TI recommend using DRV3205 for this application? Will the gate driver function normally between 40 to 50V?

Thanks in advance.

Regards,

Rohit.

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RE: DRV8850: Package drawing for DRV8850 (QFN-24 RGY) has no info on thermal pad

November 27, 2017, 9:30 am
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Hi Rick,

I installed UltraLibrarian and imported the model from your website.  Looking through the views of the package in UltraLibrarian, the thermal pad is missing.  And, when I import the exported file to my CAD tool, the thermal pad is not shown either.  So, we're back to zero, I think.  Have you had any success finding out anything from your side?

Thanks,
Scott

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RE: DRV8850: Package drawing for DRV8850 (QFN-24 RGY) has no info on thermal pad

November 27, 2017, 9:58 am
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Hi Scott,

Which CAD tool are you using? I would like to contact our CAE/CAD folks and fix that also.

I have been working on getting the drawings attached, but it is a slow process.

Another option is to go here: www.ti.com/.../slvc548
Inside this file are the DRV8850 pcb files (DRV8850_Customer_EVM.PcbDoc). This file can be viewed with an Altium viewer available online. Using the viewer, you can measure the dimensions.

Sorry for the pain.
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DRV8850: Package drawing for DRV8850 (QFN-24 RGY) has no info on thermal pad

November 10, 2017, 9:39 am
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Part Number: DRV8850

I've looked around the TI website for the package drawing for the DRV8850, since it's not in the datasheet, and I found the drawing.  However, the drawing refers to a separate sheet for the thermal pad, but there is no separate sheet.  What are the dimensions for that package?  I've attached the drawing I found.

Thanks,

Scott

[View:/cfs-file/__key/communityserver-discussions-components-files/38/mpqf143d.pdf:1230:0]

Save

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RE: DRV8301: DRV8301 - SHOWS FAULTn ON CODE START

November 27, 2017, 10:21 am
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Hi Jesal,

Have you change anything on the code? that might be causing an issue. The GVDD normal operation is about 11V, your scope shows less than two volts. When GVDD is less than 8V, the device will go into undervoltage protection and latch nFAULT low.
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DRV8301: DRV8301 - SHOWS FAULTn ON CODE START

October 28, 2017, 3:27 am
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Part Number: DRV8301

Hi there,

I have developed the Drive circuit for BLDC motor based on BOOSTXL -DRV8301.

I have successfully tested it and ran the motor identification lab2b and also lab11-lab11e(hall to fast).

Everything worked well, but suddenly it showed FAULTn .

I trapped the status register 1 which shows GVDDUV error - GVDD = 2.7V.

I had the same problem a few weeks before. Had to change the IC DRV8301.

But I would like to know why the fault occurs?

What could have possibly generated the fault of GVDD in IC?

In a bit time bound , Hope to get a response soon as possible.

Regards,

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RE: DRV8301: question about DRV8301 charge pump regulator and gate output source/sink current spec

November 27, 2017, 10:34 am
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Hi Subrat,
Datasheet recommends a 22nF cap between CP1 and CP2. Please use this values. Thank you.
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DRV8301: question about DRV8301 charge pump regulator and gate output source/sink current spec

October 24, 2017, 3:23 pm
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Part Number: DRV8301

How do we decide what value of Charge Pump Capacitor should be added between pins CP1 and CP2?  I see 0.022uF ( at the voltage rating of PVDD) used in the sample schematic in the datasheet. But I also see places where the datasheet mentions 0.22uF for Ccp 
Does this relate to the current capacity of the charge pump dc-dc used to power the gate drive circuity GVDD? 
Also, i see it says GVDD can deliver 30mA ( but is it total 30mA or 30mA can be drawn out on the GVDD pin), does that number depend on the value of Cap between CP1 and CP2? 
Also, is there a way to change the GVDD value?
I also have a question about the peak current source and sink capability, I can set the peak current capability in the registers through SPI. I see the below in the data sheet. Let's say I am operating at setting 1, then the Isource ( peak) should be 1.7A and Isink(peak) should be 2.3A. is that right? But then how does the number get affected by gate resistance? Is there already some gate resistance inside the DRV8301 on the gate drive output pins that sets these numbers or is it dependant on external gate resistance put in series between the gate drive output pins  and the mosfet gate? 
Also, its little confusing that the Vgs = 2v for source specs and Vgs = 8v for sink specs in the datasheet. How is the peak current ( source / sink) affected by the Vgs of the Mosfet. 
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RE: DRV11873: Maximum FG frequency

November 27, 2017, 1:05 pm
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Hi Na nda,

DRV11873's output PWM frequency is 125KHz. At minimum, we need 36 PWMs per electrical cycle.

125K/36 = 3.5KHz. I would not recommend applications where FG> 3.5KHz

Thanks,

Seil

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DRV11873: Maximum FG frequency

November 21, 2017, 2:10 am
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Part Number: DRV11873

Hi

According to datasheet, RPM is obtained by (FG x 60) / pole pairs.

Is there maximum FG defined?

If pole pairs are 12 and RPM = 10000 is required, is it capable of spinning motor for DRV11873?

BestRegards

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RE: DRV8841: Why DRV8871 is not suitable for solenoid driving

November 27, 2017, 1:39 pm
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Hi kpk,

Assuming the voltage and current requirements can be met with the DRV8871/2, it should be able to control a bistable latching solenoid.

We are still investigating why the selection guide say no for Solenoids.
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RE: BOOSTXL-DRV8320H: EVM GUI gives strange error for BLDC Control

November 27, 2017, 1:55 pm
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Hi Mitchel,

Do you have the Launchpad connected to the GUI? There are configuration resistors to identify the BOOSTXL-DRV8320H board. If these are not seen (due to no connection, a misaligned connection between the Launchpad and EVM, or the EVM being left unpowered), you could receive this message.

Also, please be sure to click the Launch button to the right of the DRV8320H. I have mistakenly clicked the Launch button to the left; that is for the DRV8320S.
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BOOSTXL-DRV8320H: EVM GUI gives strange error for BLDC Control

November 27, 2017, 1:28 pm
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Part Number: BOOSTXL-DRV8320H

 I am trying to drive BLDC Motor using Sensored Control. The following error is popping up when I connect my device using the GUI. I have flashed the firmware using CCS, then closed out of CCS and opened up the GUI. It says "connected", but device "not found". TI FAE Lenio Caçula has been helping me, but when he downloaded the software and followed the steps, he got the same error.

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RE: DRV8711: is BEMF pin optional?

November 27, 2017, 3:30 pm
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Hi Mert,

Could there be a problem with a solder bridge or a FET causing the overcurrent event. Would you please check the impedance of all four sets of FETs, comparing the A side with the B side?

Once the fault is asserted, all outputs are disabled in the event of overcurrent. The power supply current should be small after the fault.
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RE: DRV3205EVM: Need help to use the EVM with TMS570lc43 launchpad

November 27, 2017, 4:21 pm
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Hi Saurabh,

The DRV3205EVM GUI/firmware are designed for use with the TMS570LS12X launchpad, not the TMS570LC43. Do you have a TMS570LS12X launchpad available? The User's Guide should cover all additional set-up needed to use the EVM.

Thanks,

Garrett

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RE: DRV3205EVM: Need the schematic and the PCB file for DRV3205EVM

November 27, 2017, 6:10 pm
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Hi Rick,

OK. Thanks for your reply. I will wait for our experts's reply.
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DRV3205EVM: Need the schematic and the PCB file for DRV3205EVM

November 26, 2017, 11:59 pm
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Part Number: DRV3205EVM

Hi team,

The customer is using DRV3205EVM.

Q1: He needs the the schematic and the PCB file for DRV3205EVM.

Q2: Is the DRV3205-Q1 datasheet that is on our website the full datasheet? If it is not the full datasheet, the customer

also needs the full datasheet. 

Q3: The customer uses DRV3205EVM+ TMS320F28035EVM. But the BLDC cannot be run.

 For DRV3205EVM , EN=3.3V,DRVOFF=GND,VDDIO=3.3V,ADREF=3.3V, ERR_N pin does not have any error output.

 If the customer uses DRV8305EVM+ TMS320F28035EVM, the BLDC can be worked well.

 Would you support this issue?

If you need the customer's application information, I will send the e-mail to you.

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

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