Hi ,
I would like to know how is the control scheme for the MOTOR or where can i get the block diagram for this refference design.(DRV8353RH)
Thanks
Rohit
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DRV8353Rx-EVM kit Refference design files
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UCC2626: : Thermal Resistance to Air
Part Number: UCC2626
Hello , I am performing stress analysis on a circuit and I am looking for Thermal Resistance to Air for the Part UCC2626 used in the circuit. I couldn't get the thermal resistance to air in the datasheet provided by TI. Can anyone help me out here. The package used in the board is TSSOP28.
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DRV8704: DRV8704-EVM
Part Number: DRV8704
Hello
· Can we connect DRV8704 Evaluation Module to Delfino TMS320F28379D LaunchPad?
· What is the maximum volt that can be applied to the motor using DRV8704 Evaluation Module? The DRV8704 Evaluation Module manual does not seem to state that.
· What is the maximum continuous current that can be applied to the motor using DRV8704 Evaluation Module? The DRV8704 Evaluation Module manual does not seem to state that.
Regards
Sam
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DRV8323: Diagnosing a failure mode to confirm the problem was overvoltage
Part Number: DRV8323
Hey forum,
I've designed a BLDC motor driver board using the DRV8323SR three phase motor driver and the CSD88599Q5DC half-bridge MOSFET module.
Generally, it works well, here is a section of the schematic, which was based on the reference design of the BOOSTXL-DRV8323RH.
Image may be NSFW.
Clik here to view.
However, we occasionally see the DRV8323 die, usually the VM and some of the gate drive pins are shorted to ground. I removed one of the dead DRV8323 from a board and tested each pin with a multimeter, here is what I saw.
Every pin circled in red is shorted to ground.
Every pin circled in blue has a low resistance path (less than 20Ohm) to ground.
Every pin circled in black has a high resistance (1kOhm to 2MOhm) path to ground.
Image may be NSFW.
Clik here to view.
Vbus runs at 48V and we don't have any dissipative braking onboard, which leads to my questions.
1) Are the shorts seen on this dead DRV8323 consistent with an overvoltage condition (due to motor regeneration current?)
I am aware that the max voltage rating of the DRV8323 is 65V, hence running at 48V without dissipative braking could mean we see more than 65V on the DRV.
2) After seeing this dead DRV8323 on the board, we also see dead pins on the microcontroller connected over SPI to the DRV. Is this expected? Can an overvoltage fault on the DRV8323 cause problems with the SPI pins as well (and therefore damage the connected microcontroller)? I need to ascertain if the issue is entirely related to overvoltage of if the dead microcontroller pin are something else.
Thanks for your help.
Josh
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RE: DRV8846EVM: Can’t trigger the GUI V1_0 program for DRV8846EVM on Windows7 PC
Hi Yamauchi-san,
The location of the files can prevent the GUI starting. Please make sure the files are located as recommended in the appendix of the DRV8846EVM User Guide.
If you still have a problem, please provide the location of the launcher.exe file on the customer's PC.
The location of the files can prevent the GUI starting. Please make sure the files are located as recommended in the appendix of the DRV8846EVM User Guide.
If you still have a problem, please provide the location of the launcher.exe file on the customer's PC.
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RE: DRV8848: DC Motor Controllers
Hi Sam,
In using Brushed Motor Controllers DRV 88xx (such as DRV8801, 8840...DRV8848....etc);
(1) None of these DRV88** can report the actual value of the current to the MCU. Correct?
>> The DR8412 with amplifier and sense resistors on each ground, or a INA1xx current sense amplifier in series with each winding, can provide the actual currents.
>> The DRV8873 can report the current during Drive and High side slow decay, but not during fast decay or low side slow decay.
>> The DRV8801 can report the current during Drive, but not during decay.
>> With external amplifiers, other devices like the DRV8840, DRV8848, etc can do the same.
(2) We cannot control the current of the motor all the time. Correct?
>> If you add the ability to monitor the current as described in the DRV8412 in (1), you can.
(3) At best we can set the current level to 1 one of 32 values (as happens in DRV8843. A feature that is not available in every DRV88**). Correct?
>> Many of the devices have a VREF pin that allows the current level to be adjusted.
(4) Even if we PWM the enable pin we still cannot control the current accurately because the MCU does not get current feedback and hence has no way to accurately control that PWMed signal to generate accurate current control.
>> Correct. You will need external circuitry as described above
(5) The only exception to all the above is DRV 887*. Correct?
>> Even the DRV8873 has limitations, as mentioned in (1)
(6) Is there any other DRV88** in the family that provides current feedback to the MCU?
>> Please refer to (1)
(7) Is there any DRV88** in the family that provides can adjust the current level continuously (rather than to 32 levels)?
>> Any DRV88xx device with a VREF input has this ability. Adjusting the VREF can be achieved by using a DAC, PWM, or other method.
(8) If we use one of the evaluation board (say EVM DRV8848)….it has MCU on-board….what is the easiest way to get access to one of the analog pins of that MCU…we would like to provide current sensor feedback to that pin ?
>> The EVM were not designed for this. You can solder a small wire to the pin of the mcu.
In using Brushed Motor Controllers DRV 88xx (such as DRV8801, 8840...DRV8848....etc);
(1) None of these DRV88** can report the actual value of the current to the MCU. Correct?
>> The DR8412 with amplifier and sense resistors on each ground, or a INA1xx current sense amplifier in series with each winding, can provide the actual currents.
>> The DRV8873 can report the current during Drive and High side slow decay, but not during fast decay or low side slow decay.
>> The DRV8801 can report the current during Drive, but not during decay.
>> With external amplifiers, other devices like the DRV8840, DRV8848, etc can do the same.
(2) We cannot control the current of the motor all the time. Correct?
>> If you add the ability to monitor the current as described in the DRV8412 in (1), you can.
(3) At best we can set the current level to 1 one of 32 values (as happens in DRV8843. A feature that is not available in every DRV88**). Correct?
>> Many of the devices have a VREF pin that allows the current level to be adjusted.
(4) Even if we PWM the enable pin we still cannot control the current accurately because the MCU does not get current feedback and hence has no way to accurately control that PWMed signal to generate accurate current control.
>> Correct. You will need external circuitry as described above
(5) The only exception to all the above is DRV 887*. Correct?
>> Even the DRV8873 has limitations, as mentioned in (1)
(6) Is there any other DRV88** in the family that provides current feedback to the MCU?
>> Please refer to (1)
(7) Is there any DRV88** in the family that provides can adjust the current level continuously (rather than to 32 levels)?
>> Any DRV88xx device with a VREF input has this ability. Adjusting the VREF can be achieved by using a DAC, PWM, or other method.
(8) If we use one of the evaluation board (say EVM DRV8848)….it has MCU on-board….what is the easiest way to get access to one of the analog pins of that MCU…we would like to provide current sensor feedback to that pin ?
>> The EVM were not designed for this. You can solder a small wire to the pin of the mcu.
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RE: DRV8704: DRV8704-EVM
Hi Sam,
(1)· Can we connect DRV8704 Evaluation Module to Delfino TMS320F28379D LaunchPad?
>> The DRV8704EVM was tested with the MSP-EXP430G2 LaunchPad. The BOOST-DRV8711 is a similar EVM. Using the BoosterPack compatibility ( dev.ti.com/.../ ) shows the Delfino TMS320F28379D LaunchPad should work, but has not been confirmed.
(2)· What is the maximum volt that can be applied to the motor using DRV8704 Evaluation Module? The DRV8704 Evaluation Module manual does not seem to state that.
>> The DRV8704 was designed to operate across the recommended operating voltage range.
(3)· What is the maximum continuous current that can be applied to the motor using DRV8704 Evaluation Module? The DRV8704 Evaluation Module manual does not seem to state that.
>> Maximum continuous current is approximately 10A.
(1)· Can we connect DRV8704 Evaluation Module to Delfino TMS320F28379D LaunchPad?
>> The DRV8704EVM was tested with the MSP-EXP430G2 LaunchPad. The BOOST-DRV8711 is a similar EVM. Using the BoosterPack compatibility ( dev.ti.com/.../ ) shows the Delfino TMS320F28379D LaunchPad should work, but has not been confirmed.
(2)· What is the maximum volt that can be applied to the motor using DRV8704 Evaluation Module? The DRV8704 Evaluation Module manual does not seem to state that.
>> The DRV8704 was designed to operate across the recommended operating voltage range.
(3)· What is the maximum continuous current that can be applied to the motor using DRV8704 Evaluation Module? The DRV8704 Evaluation Module manual does not seem to state that.
>> Maximum continuous current is approximately 10A.
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RE: DRV8353Rx-EVM kit Refference design files
Rohit,
As mentioned in the error message, you will need to install controlSUITE to receive access. You can download it here:
www.ti.com/.../controlsuite
Regards,
-Adam
As mentioned in the error message, you will need to install controlSUITE to receive access. You can download it here:
www.ti.com/.../controlsuite
Regards,
-Adam
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RE: DRV8323R: DRV** + CSD**
Sam,
1. Yes this should be fine.
2. We have not used this configuration but that doesn't mean it cannot be done. I would still make sure to take into account our device's fault monitoring and error handling as things like VGS fault can occur if you're differing from the usual device layout or configfuration.
Regards,
-Adam
1. Yes this should be fine.
2. We have not used this configuration but that doesn't mean it cannot be done. I would still make sure to take into account our device's fault monitoring and error handling as things like VGS fault can occur if you're differing from the usual device layout or configfuration.
Regards,
-Adam
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DRV8323R: DRV** + CSD**
Part Number: DRV8323R
5 questions if I may;
1. Is there anything that would stop us using DRV** (for example DRV8232) + CSD** (for example CSD88584Q5DC) in high-end sinusoidal inverter applications?
2. I understand that a resistor (Rsense) can be connected as per the attached document and voltage across this resistor expresses the phase current. This voltage is fed through the Gate Driver amplifier and can be used for accurate current feedback in a high-end inverter application. Is that correct?
3. The Gate Driver provides the isolation needed in that case. Correct?
4. VDS expresses well the phase current. Can we have access to VDS for accurate current feedback in high-end inverter applications or is it only for over current monitoring
5. How can I know the physical size of a DRV** evaluation board. For example DRV8306EVM
Regards
Sam[View:/cfs-file/__key/communityserver-discussions-components-files/38/Drv-Current-Sense.docx:1230:0]
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DRV8305: 48V solution & 1-PWM Mode
Part Number: DRV8305
I understand the DRV8305 has operational voltage ranging from 4V to 45 V. For our application, we need a solution that provides operational voltages up to 48V. Would you recommend the DRV8313 instead of the DRV8305?
2) the DRV8305 can be run in 6-PWM, 3-PWM and 1-PWM mode. For the 6-PWM and 3 PWM modes use of microcontroller is optional. Correct?
For 1-PWM mode is an MCU necessary or optional?
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RE: DRV10970: motor speed & torque
Can you provide a little more information?
What are the characteristics of the motor (motor resistance, Kt, inductance)?
Does the motor always restart after 5 seconds?
Does the RD signal go high when the motor stops?
Can you provide the current waveform for phase U?
Thanks,
Brian
What are the characteristics of the motor (motor resistance, Kt, inductance)?
Does the motor always restart after 5 seconds?
Does the RD signal go high when the motor stops?
Can you provide the current waveform for phase U?
Thanks,
Brian
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RE: UCC2626: : Thermal Resistance to Air
Manish,
Junction to ambient for other devices in this package are in the 70-80 deg C/watt range.
Since this is an older device and datasheet, we will need to request a thermal model of the device and package. This can take a couple of weeks to complete.
Thanks,
Brian
Junction to ambient for other devices in this package are in the 70-80 deg C/watt range.
Since this is an older device and datasheet, we will need to request a thermal model of the device and package. This can take a couple of weeks to complete.
Thanks,
Brian
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RE: DRV10970: Extended break mode
Brian,
So there's always twake after the device enters sleep mode, even on gate drivers such as DRV8306 - I saw that it had 1ms twake. if there's no products that we have that can accommodate their request its ok, I just need to let them know.
Regards,
Dmitry
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DRV10970: Extended break mode
Part Number: DRV10970
Team,
One of my customers has a mechanism in their system that they’d like to remain locked using the BLDC motor – they were hoping to keep the DRV10970 in Brake Mode (Shorting all Phases to GND)
From what it looks like this Motor driver enters sleep mode after approximately 1.2 ms of PWM hitting 0. They have no control over this timing and would like to know if we have any suggestions to solve this condition or if there're other BLDC motor drivers that don't have this timing scheme.
Regards,
Dmitry
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DRV8303: Applying external 5V to AVDD
Part Number: DRV8303
Hi,
My customer has a question regarding the DRV8303 and its internal 6V analog supply on AVDD pin: Can I apply an external 5V to this pin through a Schottky diode so that when PVDD is missing, the two amplifiers can still work?
The gains could switch back to the default value or stay at whatever was programmed in prior to the PVDD loss. When the PVDD is restored, the internal 6V will come back up and turn off the diode. The maximum voltage at the input of these two amps will be around 1.5V at all times.
Thanks,
Chuchen
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RE: DRV8848: DC Motor Controllers
Hi
Thank you for your clear answers.
I would like to follow up on one of the questions.
Is there any DRV88** in the family that provides can adjust the current level continuously (rather than to 32 levels)?
>> Any DRV88xx device with a VREF input has this ability. Adjusting the VREF can be achieved by using a DAC, PWM, or other method.
- Can we supply VREF with PWMed signal? ...does this mean DRV88** (8848 for example) will filter this signal or do we have to filter that PWMed signal ourselves?
- In case of DRV8848 (Dual Motor) VREF will control both motors (or the Chopping limit of both motors). Correct? The motors are not independent anymore. Correct?
- Without connecting this sense resistor DRV8848 will run in an open loop manner. Correct? and in that case if Vref changes all the time the value of the current will be struggling to follow. Correct?
- If we connect the current sense resistor is there anything that would stop us supplying square wave to VREF at a frequency close to 1KHz?
- If we are not running in closed loop mode (current is not regulated).Ain1 & Ain2 can be supplied with PWMed signal and hence they vary the motor current. Correct?
- The only way to have independent current of both motors independently is by closing the current loop inside an MCU and supplying the DRV8848 with PWMed based on that external close loop. Correct?
Regards
Sam
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RE: DRV8848: DC Motor Controllers
Hi Sam,
Can we supply VREF with PWMed signal? ...does this mean DRV88** (8848 for example) will filter this signal or do we have to filter that PWMed signal ourselves?
>> You will need to filter the PWM externally to create a stable VREF voltage
In case of DRV8848 (Dual Motor) VREF will control both motors (or the Chopping limit of both motors). Correct? The motors are not independent anymore. Correct?
>> Correct, The DRV8848 VREF controls both motors. The DRV8881 has two VREFs inputs to allow separate control.
Without connecting this sense resistor DRV8848 will run in an open loop manner. Correct? and in that case if Vref changes all the time the value of the current will be struggling to follow. Correct?
>> If the xISEN pins are connected to GND directly, VREF no longer controls the current. The current is controlled by the inputs.
If we connect the current sense resistor is there anything that would stop us supplying square wave to VREF at a frequency close to 1KHz?
>> It might work in some cases, but is not recommended. At low VREF voltages, there could still be some current flowing through the load due when the outputs are enabled during the blanking time.
If we are not running in closed loop mode (current is not regulated).Ain1 & Ain2 can be supplied with PWMed signal and hence they vary the motor current. Correct?
>> Correct.
The only way to have independent current of both motors independently is by closing the current loop inside an MCU and supplying the DRV8848 with PWMed based on that external close loop. Correct?
>> Correct for the DRV8848. As mentioned above there are other devices like the DRV8881 with two VREF inputs.
Can we supply VREF with PWMed signal? ...does this mean DRV88** (8848 for example) will filter this signal or do we have to filter that PWMed signal ourselves?
>> You will need to filter the PWM externally to create a stable VREF voltage
In case of DRV8848 (Dual Motor) VREF will control both motors (or the Chopping limit of both motors). Correct? The motors are not independent anymore. Correct?
>> Correct, The DRV8848 VREF controls both motors. The DRV8881 has two VREFs inputs to allow separate control.
Without connecting this sense resistor DRV8848 will run in an open loop manner. Correct? and in that case if Vref changes all the time the value of the current will be struggling to follow. Correct?
>> If the xISEN pins are connected to GND directly, VREF no longer controls the current. The current is controlled by the inputs.
If we connect the current sense resistor is there anything that would stop us supplying square wave to VREF at a frequency close to 1KHz?
>> It might work in some cases, but is not recommended. At low VREF voltages, there could still be some current flowing through the load due when the outputs are enabled during the blanking time.
If we are not running in closed loop mode (current is not regulated).Ain1 & Ain2 can be supplied with PWMed signal and hence they vary the motor current. Correct?
>> Correct.
The only way to have independent current of both motors independently is by closing the current loop inside an MCU and supplying the DRV8848 with PWMed based on that external close loop. Correct?
>> Correct for the DRV8848. As mentioned above there are other devices like the DRV8881 with two VREF inputs.
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RE: DRV8837DSGR thermal pad condition
Hello Mr.Rick.
I confirm it.
Thank you very mutch.
Best regards.
I confirm it.
Thank you very mutch.
Best regards.
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DRV8601: HELP: We are developing a gaming product, controller/handheld, and are aware of Immersion Corporation's deep patent portfolio and have questions?
Part Number: DRV8601
It seems that that patent trolls are alive and strong and the company https://www.immersion.com/ has over 3000 patents in the use of haptics that seem to cover every possible scenario. No one can go thru 3000 patents, but the first couple seem to be so broad that anyone that puts a vibrator motor in ANYTHING (especially game controllers, phones, wearables, etc.) are covered by their patents.
They have NEVER made a product and simply sue large companies AFTER they have installed vibrators in their product (sony, microsoft, lg, samsung and others), all of which have lost in court and had to pay royalties.
My question to TI is simple, if we use one of your driver ICs to control a vibrator motor in our product, do YOU have any deal in place with Immersion that stipulates that the license fee is baked into the motor driver IC? OR we can go thru a program via TI to get a discounted license fee per unit?
Basically, many technologies like USB, MP3, etc. have licensing fees, and many ICs have these baked into the cost, so if you use the IC, the manufacture has already paid this fee for a large volume and thus got a discount, and everyone is happy.
We are investigating this, do not want to be sued, but again, don't want to pay for something we don't need to, and of course don't want to waste a lot of money to have attorneys pour thru 1000's of pages of patents to see if our application is covered or not by Immersion IF this is MOOT due to TI having some kind of deal in place.
Does anyone from TI have any intel about this or can put me in touch with someone that can speak to this?
Thanks,
Andre' LaMothe
ceo@nurve.net
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