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DRV8886: Connecting to a motor

August 8, 2019, 5:38 pm
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Part Number: DRV8886

Hello,

Our customer have a plan to use the DRV8886 for the new project.

The customer used the DRV8818 for last project.

They check the Figure 26 on the datasheet of the DRV8886 and have a question.

The xOUT1 is connected to minus pin of the motor and the xOUT2 is connected to

plus pin of the motor. Is it correct?

I checked the indexer of the DRV8818 and the DRV8886.

The DRV8818 and the DRV8886 rotate in opposite direction with same DIR setting.

Do you want to rotate in same direction with above connection?

Best Regards,

Naoki Aoyama

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BOOSTXL-DRV8301: location to sense the motor phase current

August 8, 2019, 6:00 pm
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Part Number: BOOSTXL-DRV8301

i notice there are 3 ways to sense the motor phase current: low-side current sensing, hign-side current sensing and in-line phase current sensing just like the figure. and  the BOOSTXL-DRV8301 use the low-side current sensing. but i don't know whether the software of insta-spin FOC  support all these these ways? if i design a board which use the in-line phase current sensing? what should i change about the software? 

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DRV8825: Setting DECAY for DRV8825

August 8, 2019, 11:29 pm
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Part Number: DRV8825

Hi,

We are using stepper motor driver DRV8825 in our project.

Stepper motor type we are using in our project is 4 lead bipolar type.

When DECAY is set to Lo (low speed) and the reference voltage is gradually increased to reach a specific voltage (about 180 mV),

the holding force (motor drive current) during excitation immediately increases.

After that, even if the reference voltage is changed, the excitation holding force does not change.

In order to make the holding power of excitation variable, it is necessary to once set the voltage to 0V and set DECAY to Hi (high speed).

We have probed DIR, STEP, FAULT pin of driver IC but no issues were observed.

When DECAY is set to Hi, the holding power changes as the Ref level changes as expected.

Are there any restrictions on when to set DECAY?

Please let us know what is causing the DRV8825 to behave like this. 

Thanks,

Seiya

Hi,
We are using stepper motor driver DRV8825 in our project.
Stepper motor type we are using in our project is 4 lead bipolar type.
　
When DECAY is set to Lo (low speed) and the reference voltage is gradually increased to reach a specific voltage (about 180 mV), the holding force (motor drive current) during excitation immediately increases.
After that, even if the reference voltage is changed, the excitation holding force does not change.
In order to make the holding power of excitation variable, it is necessary to once set the voltage to 0V and set DECAY to Hi (high speed).
We have probed DIR, STEP, FAULT pin of driver IC but no issues were observed.
　
When DECAY is set to Hi, the holding power changes as the Ref level changes as expected.
Are there any restrictions on when to set DECAY?
Please let us know what is causing the DRV8825 to behave like this. 
　
Thanks,
Seiya
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DRV8871: Flyback Diode

August 9, 2019, 2:22 am
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Part Number: DRV8871

Hi,

We are designing a DC-Motor controller using DRV8871. Our DC Motor is rated 12V 150mA.

Our questions are,
1) Is it recommend to add external flyback diodes between the Motor Driving OUT1 & OUT2 pins of DRV8871? Or DRV8871's integrated flyback diodes sufficient?

(We checked DRV8871EVM schematics and no external flyback diodes are used)

2) Can DRV8871's Logic-Level Inputs be directly connected to MCU GPIO pins (3.3V) or is it recommended to add a series resistance to limit current drawn by DRV8871 during logic high (3.3V) from MCU GPIO pins?

(The MCU is battery powered, so power consumption by any external components connected through MCU GPIO pins is of utmost concern) 

Regards,
Ashok

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DRV8872EVM: Different range of duty cycle between DRV8872-Q1 and DRV8872EVM

August 9, 2019, 3:29 am
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Part Number: DRV8872EVM

Hello supporting team,

Could you tell me why duty cycle range of DRV8872EVM is different from that of DRV8872-Q1?

I saw [It is capable of an approximately 25-kHz output that can be adjusted from 5% to
95% duty cycle. This square output signal will switch from 0 V to V5P0.] in datasheet of DRV8872EVM

On the other hand, datasheet of DRV8872-Q1 says [The IN1 and IN2 pins can be set high and low for 100% duty cycle drive, and ITRIP can be used to control the
current, speed, and torque capability of the motor].

DRV8872EVM could not operate when duty cycle is <5% or >95%, is it correct?

Best regards,

Ochi

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DRV8889-Q1EVM: How to install GUI composer Runtime locally?

August 9, 2019, 7:01 pm
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Part Number: DRV8889-Q1EVM

Hi,

My customer has no internet access according to their company's policy, so they can only install the composer run time from local file, but I cannot find the file correctly, I extracted the .zip also but cannot find it, could you please help to identify the steps? Thanks. 

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DRV2605L: What are maximum output voltage and output current supported by DRV2605L IC and DRV2603 IC?

August 9, 2019, 11:22 pm
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Part Number: DRV2605L

Hello, 

I am planning to use either DRV2605L or DRV2603 in an application. I couldn't find the maximum output voltage and output current values supported by the ICs in the corresponding datasheets. Please answer the below queries inline.

1) What are the maximum output voltage and output current supported by DRV2605L?

2) What are the maximum output voltage and output current supported by DRV2603?

3) Also please tell the approach to figure out the maximum output voltage and output current.

These details help to select an appropriate haptic actuator.

For your reference - 

Datasheet of DRV2605L: http://www.ti.com/lit/ds/symlink/drv2605l.pdf

Datasheet of DRV2603: http://www.ti.com/lit/ds/symlink/drv2603.pdf

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DRV8323: The failure of chip initialization results in motor burnout.

August 11, 2019, 8:02 pm
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Part Number: DRV8323

Hello, TI engineers，

When I used DRV8323s as motor driver, I chose 1X mode, and the DIR foot of the chip was pulled up to 3.3V by default.

Circuit power sequence, first the main control system power on, and then the motor drive circuit power on;

When we forget to add the necessary delay in the initialization of DRV8323S circuit, the 1x mode of DRV8323S configuration will fail and the chip will work in the default mode.

Then the problem arises: DRV8323 works in the default mode (6x), DIR (INHC) foot pull, when one of the Hall signals (INLA LINLB) is at a low level, a phase of the motor will always be on, the current is very large, the motor is burnt out;

DRV8323S works in the default mode, and the overcurrent protection threshold is about 30A.

Finally, my question is, is this kind of mistake a problem with my circuit design? How can it be avoided?

Thank you!

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DRV8847: DRV8847S OLD operation waveform

August 11, 2019, 11:30 pm
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Part Number: DRV8847

Hi,

DRV8847S is set as 2 pin interface and IN1 to IN4 is zero. So OUT1/3 output low and OUT2/4 output high. VM is 12V.

Below is the OLD operation waveform(yellow-OUT1, blue-OUT2):

Could you please help to explain the OLD operation? Why OUT1 goes up to higher than VM and OUT2 goes down to lower than zero?

Thanks!

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DRV8842EVM: DRV8842 OCP recovery by nSleep signal..

August 12, 2019, 7:00 am
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Part Number: DRV8842EVM

Hi.

Customer has tested DR8842EVM and found out, that OCP condition can be removed by nRESET signal and also by nSLEEP signal.

Based on datasheet OCP recovery can be done only by power cycle and nRESET signal.

Can you please advice if this behaviour is intended and how this can be avoided?

 

Thank you and best regards

Stefan

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DRV8876: DRV8876 - Independent Half-Bridge

August 12, 2019, 8:46 am
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Part Number: DRV8876

I'm having a problem with the circuit attached.

The datasheet specifies the current capability as 3.5A of Peak, but when I test my circuit with a valve of 12V/0,5A , the fault pin goes to LOW and the voltage on valve fall to 0.4V.

I'd like to know if there is something wrong with my circuit? Any suggestion to resolve the problem.

Thanks

 

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DRV110: EN pin maximum voltage

August 12, 2019, 8:57 am
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Part Number: DRV110

Hi,

What is the maximum voltage we can apply on the EN pin of the DRV110?

I blew one IC after using 24VDC to toggle ON/OFF. Then I used the evaluation board DRV110EVM and measured 5 Votls on the EN pin.

I could go with 5 Volts but I would like to know the limitation of this input.

thank you.

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DRV8876: DVR8876 vs DRV8872 What are the diferences?

August 12, 2019, 2:50 pm
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Part Number: DRV8876

Hi.

I've been looking over both the DRV8872's and the DRV8876's datasheets and I can't figure out what major differences are there between them.

They both allow for current regulation and sensing, fault reporting, etc. The 76 has CPUV reporting...

I'm trying to decide between them for usage with a brushed DC motor.

Also, is there a driver that I am not seeing that has these features, allows for current limiting in the 1 to 2A range, but also a fault reporting system similar to the DRV8873's? I coudn't find one, so I just settled for the 72 or 76.

Thanks in advance.

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CCS/DRV8704EVM: DRV8704EVM

August 12, 2019, 4:18 pm
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Part Number: DRV8704EVM

Tool/software: Code Composer Studio

Tthis is a extract from DrV8704 datasheet :

"A simple PWM interface allows easy interfacing to
controller circuits. A SPI serial interface is used to
program the device operation. Output current
(torque), gate drive settings, and decay mode are all
programmable through a SPI serial interface."

Can you control motors without the PWMs pins just using SPI interface?

Or the SPI interface is only used to configure? I see there is a DRIVE register but I am not sure.

Thanks in advance,

Mikias Mekonnen

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DRV8840: Question for DRV8840

August 12, 2019, 11:46 pm
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Part Number: DRV8840

Hi Team,

The customer is experiencing below issue and needs your help.

PIN3 VCP should be configured as shown in the manual.

But the design is wrong, but it works. What is the reason? Is there a risk?

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DRV8837: DRV8837 goes into sleep mode

August 13, 2019, 12:32 am
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Part Number: DRV8837

PIN.7 is nSLEEP.Logic low puts the device in low-power sleep mode,but we need GPIO to control nSLEEP. We don't have any extra GPIO to use. Is there any other way to enter sleep mode?For example, IN1 and IN2  are logic low at the same time

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DRV8323R: Arduino DUE library

August 13, 2019, 2:52 am
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Part Number: DRV8323R

Hallo,

We have are own design with the SAM3X8E and the DRV8323R, and we use the ARUINO IDE

 We can use both the DRV8323RH and the DRV8323RS depending on the placement of the resistors .

We first tested the system with the DRV8323RH and now we want to test the system with the DRV8323RS.

The question is: can you give an advice about the SPI library I can use.     ( Arduino DUE )

Thanks in advance,

Leen

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DRV8323: High current consumption while operating without load

August 13, 2019, 4:04 am
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Part Number: DRV8323

Hi, I'm driving totally 18 MOSFET's with DRV8323RSRG used with MCU TMS320F28069. Total gate charge of single mosfet is 91nC. When I apply 45KHz pwm with 50% duty cycle (VDD 12V), supply current is approximately 170mA. Output voltages are always OK. But when the power supply voltage increases, the current consumption increases too and DRV starts heating. 

Measured values in various power supply voltage with no load: 

when DRV disabled:  12V:  50mA,

20V:  30mA

30V:  20mA

DRV enabled(without pwms): 12V: 70mA

     20V: 40mA

     30V: 30mA

all 3 phases active(18x active MOSFET) :  12V:170mA

20V: 210mA

30V: 230mA

only one phase active(any)(6x active MOSFET) : 12V: 100mA

     20V: 90mA

     30V: 90mA

I tried to adjust IDRIVE, TDRIVE, and also check deadbands on the scope if pwms don't cross, but that has no effect on curent consumption. 

Screenshots of VGS when supply was 12V:

high side VGS:

low side VGS: 

Please help if anybody knows what may cause this problem.

Thanks a lot. 

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DRV8343-Q1: DRV8343 - When does overcurrent deglitch time Tocp_deg start?

August 13, 2019, 5:20 am
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Part Number: DRV8343-Q1

Hello everybody,

i have a question regarding the Vds overcurrent monitoring. The DRV8343 doesn't have a blanking time, like the DRV8305.

So when is the starting point of the Vds deglich time at this device? After the dead time? after tdrive ? or at any other time?.

I couldn't find this information in the datasheet.

Best regards 

Thomas

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BOOSTXL-DRV8305EVM: Is there any high voltage motor driver other than TMDSHVMTRPFCKIT?

August 13, 2019, 1:34 pm
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Part Number: BOOSTXL-DRV8305EVM

Hello,

I want to get a motor driver from TI. Is there any less expensive high voltage motor drivers other than TMDSHVMTRPFCKIT? I saw that there are boostxl-drv8301 or boostxl-DRV8305 but these are for low voltages, I need a driver with higher input voltage range (less than 150 V).

Regards,

Ata

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