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BOOSTXL-DRV8320S: Is it "normal" that a DRV8320H chip is soldered on a BOOSTXL-DRV8320S board?

April 1, 2019, 6:45 am
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Part Number:BOOSTXL-DRV8320S

Hello!

I've ordered 3x "BOOSTXL-DRV8320S" from Mouser, and (after the issues written below) 2x "BOOSTXL-DRV8320S" from DigiKey.

- All packages contain a valid DRV8320S label on the outside, and all seals were/are okay.

- I opened two of them for evaluation.

- As the SPI connection "didn't work" (no data transfer from DRV back to µC), we looked over code, investigated conections, etc.

- Finally we looked at chip markings on the eval-board and we've seen "DRV8320H" on the boards - therefore no communication.

My questions are now:

- Is there always a "H" chip version on the boards (for both BOOSTXL-DRV8320S and H)?

- Should I solder the "S" chip version onto the boards?

- Should I notify Mouser and DigiKey for sending me the wrong boards? The labels are okay, they say "DRV8320S" but the chip is "DRV8320H". I doubt a bit that both of them giving out wrong boards - independently from each other. That's the reason I ordered the second two of them from DigiKey, just to be sure...

PS: If this is "normal" I would like to know which spec/datasheet I should read, e.g. where is this documented. I've read multiple times the manual of DRV832x and BOOSTXL manuals (both H and S, seems they are the same), but I must have missed this then.

Thank you in advance for trying to answer my questions,

kind ragards,

Stefan Schmid

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DRV8873: DRV8873: Is DVDD generated in SLEEP?

April 1, 2019, 6:52 am
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Part Number:DRV8873

Hi,

Asi in topic: Is 5V on DVDD pin generated in SLEEP mode?

It seems that it is not but I want to be sure.

BTW Would be good to have this information in datasheet.

Regards,

Pawel

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BOOSTXL-DRV8320RS: How to order/sample -

April 1, 2019, 7:59 pm
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Part Number:BOOSTXL-DRV8320RS

new BoosterPack BOOSTXL-DRV8320RS shows available through the TI site. But Every time i try to click the button, it creates a request and that request gets rejected. How do I buy them? Will they be available through distributors?

thanks

Subrat

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DRV8308EVM: can not run close loop frequency mode

April 1, 2019, 9:01 pm
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Part Number:DRV8308EVM

Hello experts,

I have just picked up a DRV8308EWM to evaluate my motor with Hall sensors. Following the turning guide "http://www.ti.com/lit/ug/slvua41f/slvua41f.pdf", I can spin my motor very well. the application DRV8308 EWM 0.1.0 help me to spin motor.

1. The PWM is working properly. I can adjust speed by change PWM duty cycle.

2. Switch to Clock Frequency Mode. It seem does not work. Even I turn on/ turn off ENABLE and Reset many time each evaluation. Even I tried to increase SPDGAIN, LOOPGAIN, SPEED, AG_SETPT ... as what showed in turning guide document, but nothing are improve.

the video record my process: https://youtu.be/cdJH0whW0Dk

I have some questions:

1. I used clock from MSP430 MCU, the clock output from MCU seem to be high frequency, approximately 24 KHz. While the DRV8308 support Hall frequency only up to 6.7 Khz (file drv8308.pdf, item 7.4.1). I am afraid there are too much difference between clock input and clock feedback will make system does not work properly. Is that Right?

2. How to make frequency come out from MPS430 slower from the GUI app?

3. In frequency close loop mode, does driver care about duty cycle?

4. Are there anything wrong on my process? Please tell me

Best regards,

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DRV8305-Q1: DRV8305-Q1 dead time

April 1, 2019, 11:28 pm
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Part Number:DRV8305-Q1

Hello,

My customer is using DRV8305-Q1 , they found that the dead time of the half bridge is different when rising edge and falling edge. The Td_min=280ns，and Tdtp=35ns. Thanks!

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DRV2604-2605_DESIGN_TOOL: DRV2604

April 1, 2019, 11:42 pm
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Part Number: DRV2604-2605_DESIGN_TOOL

Hi:

I'm using DRV2604 to drive an ERM vibrator. Please provide me the detailed explanation of each field in Design Tool.

Thanks

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DRV8702-Q1: Reverse Battery Protection Circuit

April 1, 2019, 11:45 pm
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Part Number:DRV8702-Q1

Dear, Sir.

I would like to make sute the behavior of Reverse battery protection circuit which

is described on DS page 37, figure 45.

I am guessing;

1. Under reverse battery condion, DRV8702-Q1 will start to work, so VCP voltage

    will go up from VM pin voltage. 10kOHM resistor, Transistor & diode is for dischaging

    VCP voltage goes down to turn OFF the external NMOS FET.

    I wonder my understaning is correct?

2. Under Reverse battery condition, the real VM voltage is GND.

    If the voltage is floating, Above protection could be worked correctly?

    Can expect the correct discharging?

Please give your advice.

Best Regards,

H. Sakai

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DRV10987: DRV10987 no motor Reliability test

April 1, 2019, 11:58 pm
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Part Number:DRV10987

Hi

I have a project use DRV10987 now we need to do reliability test, but surroundings we can't put many motors how can I add load.

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DRV8320: DRV8320 nfault PIN problem

April 2, 2019, 1:34 am
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Part Number:DRV8320

When I use the  DRV8320H , the  Supply voltage above 30 V , the  nfault Pin will be set to low .  In the datasheet   the Supply voltage is 6V~60V. What's the situation about the  nfault Pin ?

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DRV10987: Abnormal Kt problem

April 2, 2019, 2:17 am
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Part Number:DRV10987

Hi,Support team!!

I am using the DRV10987 with a fan with four pole pair, Kt =  9.2mV/Hz, Rph = 1.08 Ohm, Imax = 1.6A, RPM max = 30000.

"DRV10987 0x90 0xC33E"
"DRV10987 0x91 0xA3A"
"DRV10987 0x92 0x20F1"
"DRV10987 0x93 0x2AF8"
"DRV10987 0x94 0x3F8F"
"DRV10987 0x95 0x703F"
"DRV10987 0x96 0x47"

Q1)BEMF constant(Kt)(mV/Hz) value in display tab of GUI should be not changed,but it is changing according to frequency.

      does it mean the Ktc is displayed?

Q2)in my application,As frequency increases ,the BEMF constant(Kt)(mV/Hz) value in display tab of GUI decreases.

     if the rotation speed increase more than 10000rpm ,the BEMF constant(Kt)(mV/Hz) value became less than 0mV/Hz and the motor was stopped because Abnormal Kt is detected.

     I would like to know how to calculate the value and whether this behavior is correct or not.

    in the datasheet,   the "motorKt" is integrated periodically while motor is spinning

                                  Ktc (V/Hz) = ({MotorKt} / 2) / 1090

Q3) the datasheet recommends maximum operating closed loop speed is 1000Hz.(electrical frequency)

     as I wrote before, I would like to use DRV10987 under 30000rpm,4pole pairs BLDC. 

    is it Out of scope of specification?
Thanks and best regards.
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CCS/BOOSTXL-DRV8301: Inertia and Friction value is not loaded from 'user.h' InstaSPIN Projects and Labs 5d

April 2, 2019, 2:21 am
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Part Number:BOOSTXL-DRV8301

Tool/software: Code Composer Studio

After estimating Inertia (106.6666717) and friction (-106.6666717) from lab 5c, those values were added to 'user.h'. Then while running lab 5d as per the instructions in InstaSPIN Projects and Labs User’s Guide, watching the variables in watch window, Inertia and Friction values are not loaded automatically. But getting the error ID 1012 in 'gMotorVars.SpinTAC.VelIdErrorID' while setting the variable “gMotorVars.Flag_Run_Identify” equal to 1. What should I do?

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can DRV8308 lock a BLDC actively?

April 2, 2019, 2:22 am
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can DRV8308 lock a BLDC like a stepper? ie, active two half bridge, so motor can be lock

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DRV8701: DRV8701P Affect output current capability factors

April 2, 2019, 6:34 am
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Part Number:DRV8701

Dear :

Setting: the frequency=20K,  Rsense=0.01Ω  Vref=2V
So Ichop=2v/20k*0.01=10A.  Rdriver=100K  connect to AVDD.

 I found  when Duty=50%,  I block the motor, and the output current reach 5~6A ,The motor will easily stop .
change the duty to 100%,  I block the motor , the motor will not be easily stop.
Actually, I hope the output current can reach 10A, even the duty reach to 50%, so i think, there maybe something wrong on the sch.
Pls help to confirm this ,thanks

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DRV8886: DRV8886 Bulk Capacitor

April 2, 2019, 7:49 am
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Part Number:DRV8886

Hello,

I have the following questions related to the right performance of the bulk capacitor and the suitability of this capacitor in small PCBs.

- Is it necessary to use an electrolytic capacitor? Could I use one or several ceramic/tantalum capacitors instead?

- Is there an estimate value of the bulk capacitor according to the current changes of the driver? Could this capacitor be shared by 4 drivers, or each driver needs its own bulk capacitor?

Thanks in advance

J.R.

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DRV8834: Single channel driver with 2 ch

April 2, 2019, 7:55 am
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Part Number:DRV8834

Dear Support team,

Is it possible to operate as single channel driver by connecting AOUT1 and BOUT1, AOUT2 and BOUT2 with DRV8834?

Best Regards,
Hirokazu Takahashi

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UC2625-EP: UC2625-EP Application

April 2, 2019, 9:16 am
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Part Number:UC2625-EP

Reviewing a legacy product with UC2625-EP.

New to motor control and currently have no hardware to verify the following which is why I am requesting verification of the interpretation of Data Sheet and U-115 app note.

BLDC Motor running 100% duty cycle( No PWM switching) using just Hall Sensors for commutation, 120degree Hall Sensor

Referencing the standard 6 step commutation model with 2 electrical cycle per 1 mechanical cycle

motor rpm =16K (61.5uS/ rotation), 1 electrical cycle = 31.25uS,  6.25uS per each of the six commutation periods

When driven the Power switches are on for two consecutive commutation periods, with appropriate sequencing,  in this case, for a period of 12.5uS.

Q1) Are the above relationships correct?

One of the Power Switch is on for two commutation steps while while 2 Power Switches will change state over that time period, standard six step model.

The RC oscillator is set to 181KHZ (nominal, tolerances excluded for this example), clk period = 5.52uS => dead time period, Controller injects 1-2 clk period results in a dead time of 5.52uS up to 10.5uS

Q2) Is the following correct?

Two commutation period  =   dead time + Power Switch on time

Power Switch on period = 12.5uS - (n*5.25us) with n=1 or 2 results in a Power Switch on period ranging from 7.25uS  to low of  2uS.

Q3) What Power Switch(s) is the dead time applied too; 1) both transiting devices or 2) just delay the Power Switch turning on?

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CCS/BOOSTXL-DRV8305EVM: C2000 F28379D delfino launchpad unable to accurately sense voltage and current outputs from DRV8305EVM

April 2, 2019, 9:06 am
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Part Number:BOOSTXL-DRV8305EVM

Tool/software: Code Composer Studio

I'm using the C2000 launchpad F28379D with the DRV8305EVM, and I want to read the values of the currents and voltages : ISEN_A, ISEN_B and ISEN_C and eventually VSEN_A, VSEN_B and VSEN_C.

unfortunately, when i run my code in CCS, All the values of voltages and currents are equal to 4095.

For the pwm i configured PWM1A and PWM1B for the phaseA leg, and PWM3A and PWM3B for the phaseC leg. the PWM2 i'm just using it as interrupt for the ADC.

so I don't know what causing this problem, is it the PWM ? or maybe i didn't configure my ADC module well ?

hope someone can help.

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DRV8886AT: How to reduce hold(stop) current of stepper motor

April 2, 2019, 5:46 pm
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Part Number:DRV8886AT

Hi,

Does TI have a DRV with the function to reduce the hold current of a stepper motor?

Our customers use the ONSEMI : STK672-632A-E. This hybrid product has two excitation current modes, which can reduce the current while the motor is stopped.
According to the DRV8886AT data sheet, is the description in the section “7.3.5 Controlling RREF With an MCU DAC” a function that meets the customer's request?
Customers will use both bipolar and unipolar stepper motors.
Best regards,
Hiroshi
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DRV8353R: INC setting at 1x PWM mode

April 2, 2019, 6:12 pm
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Part Number:DRV8353R

In  the Figure 22, I am confused why INHC is high.

According to the 8.3.1.1.3, 1 xPWM Mode (PWM MODE =10b)

The INHC input conrols the direction throguh the 6 step commutation table which is used to change the direction of the motor when hall sensors are directly controlling the INLA, INHB, and INLB state inputs. Tie the INHC pin low if this feature is not required.

Then when I don't have hall sensor which measure the rotor position, shall I set INHC high or low?

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Setting of Current Limiting Protection for DRV8873-Q1

April 2, 2019, 7:45 pm
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With regard to current limiting protection, IPROPI pins are designed to reach the ground through a resistance of 1680 ohms. At this time, Io current is 3.274A, so the overcurrent protection is 3.274A? Is that correct?

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