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RE: DRV110EVM: Application Suitability

February 6, 2018, 8:41 am
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Hey Lewis,

Happy to help here!

I believe it may be well-suited for your application. It sound like you are looking for a voltage control method but the DRV110 is a current controller. It sources a PWM to a FET, allowing current to flow through the solenoid/relay/etc. A current sense resistor is used on the low-side to measure current through the solenoid. You set a peak and hold current using separate resistors and a hold time using a capacitor. The parameters you mentioned are certainly achievable with the DRV110.

You shouldn't need any protection between the driver and coil because the DRV110 controls the FET, no current actually flows through the DRV110. My only question would be is the same voltage for driving the pick what would be used for VIN?

If you are wanting to test with the DRV110EVM you will need to replace the FET on the EVM with a higher current FET, or test with shorter peak
and hold current. It is rated for 1A continuous current. At 2.9A it could only take a pulse of around 1-10ms. Besides replacing that FET the EVM is a good preliminary test tool. There are also transient simulation models for TINA in the product folder (www.ti.com/.../toolssoftware).

Regards,
Kevin
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RE: DRV110: Ripple on Input Voltage

February 6, 2018, 8:56 am
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Hi Merlin,

Thanks for providing those screenshots. If possible, can you send your DRV110 schematic portion?

You may have caught that your Rhold was off, based off your second message, but just in case I wanted to point out that for an Ihold of 0.1A your Rhold should be around 100kohm. With 606kohm the Ihold is around .017A. That may have been the problem because it does look noticeably better once you shorted HOLD to gnd, Ihold = 0.05A. It still isn't up to 0.1A but it's closer than before.

Regards,

Kevin

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RE: DRV8701: How to get EMK Voltage from a DC Motor

February 6, 2018, 10:06 am
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DRV8701: How to get EMK Voltage from a DC Motor

February 6, 2018, 8:44 am
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Part Number: DRV8701

Ladies and gentlemen,
we would like to use the DRV8701P for our serial products. We want to control different DC motors and keep them constant over their entire speed range with regard to the speed. For this purpose, we measure the returned EMF voltage and give it to a SW controller, which in turn sets the PWM ratio. Unfortunately, however, it is the case that the DRV8701P chip sends back approx. 0.7V EMF voltage even at standstill and we cannot distinguish this voltage level from a low speed. In earlier discrete designs, we grounded an N-channel MOSFET so that the EMF voltage was always positive. The DRV chip does not allow this. Is there a standard application for measuring the EMC voltage?
Thank you for an answer that decides whether we can use the DRV chip.

Translated with www.DeepL.com/Translator

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RE: DRV8323R: I think I found major defect on DRV8323RS.

February 6, 2018, 10:16 am
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Hi David,

Can you provide a schematic of the DRV8323RS connections to and from the motor and mcu?
Do you plan to use the align and stop states available in the 1x PWM mode?
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DRV8323R: I think I found major defect on DRV8323RS.

February 1, 2018, 11:56 pm
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Part Number: DRV8323R

Hi this is David!

I am currently developing motor driver board with ti's drv8323rs chip(btw, I love this chip xD)

Anyways, I am using 1x PWM mode and there's a problem with this.

Whenever I put ENABLE to high it goes back to the initial value which is 6x PWM mode.(which is normal operation)

The problem here I think here is that the hall sensor line goes directly into INLA, INHB, INLB and do something with 6x PWM mode(might short since hall sensor INHB, INLB can get high on the same time)

So the motor makes some quite a loud noise before I turn into 1x PWM mode through SPI.(sometimes so large amount of current go through even the battery BMS cut the power)..

is it a defect?

if not, how can I solve this problem

Thank you for your help

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RE: DRV8703-Q1: The driver is not starting to "drive"

February 6, 2018, 10:43 am
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I've mounted 1uF on Vcp
I've tested it with a scope and i saw pwm, but little 'sawteeth-y' 0 to VM on the motor outputs.
But with motor connected it only buzz a little.
VM = 7.6, DVDD = 3.3, AVDD = 5.0, VCP = 14.1, CPL = 3.7, CPH = 10.7
I use it with Toshiba TPWR8503NL mosfets, they don't have much Qg.
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RE: DRV8703-Q1: The driver is not starting to "drive"

February 6, 2018, 11:32 am
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Hi Mateusz,

What PWM frequency are you using?
What duty cycle? 
What is the MODE pin setting?  << Sorry I forgot your schematic showed this pin is set to 0
How are driving the two inputs (IN1/EN and IN2/PH)?

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RE: DRV10987EVM: Not able to set parameters in EVM GUI

February 6, 2018, 11:51 am
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Hello Oliver,

The GUI should be able to accept decimals and units (u and m) in each of the text boxes. Please download and install the LabView 2014 Runtime Engine and try it again, note you may have to reinstall the GUI to make it work: www.ni.com/.../

When you do eventually hook up the EVM, a quick check is to click the manual refresh button in the top right to ensure the spots were correctly populated. They will update and display the value that was successfully inserted into the GUI. If the numbers show the incorrect value, then the write command to our device was not successful.

Best,
-Cole
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DRV10987EVM: Not able to set parameters in EVM GUI

February 6, 2018, 10:08 am
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Part Number: DRV10987EVM

Hello all,

i need your help concerning configuring the DRV10987 EVM using the Getting Started Guide.

I Installed the EVM GUI and started it in Demo Mode(same happens when EvalBoard is attached) to get you some Screencaps.

When i try to set Phase resistance to below 1 using decimal dot, input is refused, when i use comma it gets reverted back to 0.

When i use prefixes (m for milli, u for micro) the numbers also get reverted.

Do you have any idea what i could do to fix this?

The installer was asking me to download NI Runtime 2014, which i did by the link provided in the installer.

do i need to update this?

See attached screencaps for expanation.

Selecting another Eval Board from Dropdown on start makes the T Control Advance work as expected.

Do you have any hints for me?

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RE: DRV8703-Q1: The driver is not starting to "drive"

February 6, 2018, 11:54 am
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I was using 10.8kHz PWM, i also tried 1.08kHz.

Duty 0, 10%, 50% and 100% controlled from MCU. Hi level is 3.3V

IN1 is PH, i set it constant to 3.3V

IN2 is PWM, i know it works, because on my meter the rms voltage is right..
This is exact schematic, it's 2 PWMs on schematic but i left it for optional setting Mode to Hi-Z. Bulk HV caps are also there, not shown on this part of schematic.

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RE: DRV8703-Q1: The driver is not starting to "drive"

February 6, 2018, 12:39 pm
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After changes in the circuit i got IC little lifted up. So after changing the VCP caps, which definitely helped i made some soldering issues - i redid the joints with the soldering iron (it was put first with a hot-air), so i can't tell what was exactly wrong, but i suspect 1 or 2 gates were floating. It's now fully working, so the setup is right, it was my mistake to not check the soldering properly.. Those QFNs are quite hard to check with angles i could get and loupe i had.
Thanks very much for help. You'd led me to troubleshoot the problem.

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RE: DRV8703-Q1: The driver is not starting to "drive"

February 6, 2018, 1:17 pm
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Hi Mateusz,

We are glad to hear you found the problem. Please let us know if you need further assistance.
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RE: DRV8844: DRV8844 nRESET pulse width

February 6, 2018, 2:25 pm
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Recommended nRESET pulse width is 10us. Thanks.
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DRV8801-Q1: about PHASE control

February 6, 2018, 5:34 pm
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Part Number: DRV8801-Q1

Hi all,
I have questions about the PHASE control of DV8801-Q1 as below;

(1) If CW / CCW switching is performed by PHASE signal while ENABLE = "H",  
     Is there a problem with the drive stage or IC?

(2) Is it necessary to change CW / CCW while ENABLE = "L"?
     If yes,
      Is it necessary to confirm the motor stop?
      Under what conditions can you change PHASE even if you keep ENABLE = "1"?

【Motor specification】: DC brush motor
· Rated voltage: 24 VDC
· Rated load: 9.8 mNm
· Rated power consumption: 1.4 W
* Actually, it is used at DC 20 V, and the steady current value is 250 ~ 350 mA.

Best regards,
Toshi

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RE: DRV for reversing motor design

February 6, 2018, 9:24 pm
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Christian,

Sorry for my delayed response. Yes you can change the motor spinning direction on the fly using the FR pin. The motor will first coast down to a certain low speed level and then the device will start driving the motor in the opposite direction.

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DRV for reversing motor design

December 24, 2017, 10:06 pm
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What is the recommend minimal configuration for a 12V 0.5A BLDC Fan Motor that with variable speed control and the possibility to change rotation direction.

Can this be achieved without direct MCU control for example with PWM input to the DRV. For example duty < 50% = cw , duty>50% = ccw.

I would prefer  a sensor-less design because of the ease of the motor.

If MCU is needed, please suggest a configuration and design example.

Production will be about 10k unit per year. (no over-spec. suggestions please. )

Do you have motor control examples for CC1350? If possible I want to control the motor directly via Sub-Giga band.

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RE: DRV8844: DRV8844 nRESET pulse width

February 6, 2018, 9:34 pm
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Please add this info into the datasheet.

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DRV8844: DRV8844 nRESET pulse width

February 5, 2018, 3:38 am
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Part Number: DRV8844

What is the minimum nRESET pulse width to reset nFAULT status after overcurrent ?

It isn't described at datasheet, ~200nS is too low to do this :-(

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RE: DRV110: Ripple on Input Voltage

February 6, 2018, 11:52 pm
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It looks like I had a wrong factor in the formula for R hold.

I'll test it this afternoon.

Schematic

R5,R4 = 0 Ohm

on the sense line there is a 10k series resistor.

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