Hi,
I am trying to use UC2625 in a design. Planning to drive N-channel MOSFETs on high and low-sides.
UC2625 PU outputs are in open-drain configuration, PD outputs are something like push-pull or totem-pole. (PU active low, PD active high)
Are there any gate drivers, to accept these two inputs? Or what kind of gate driver should I implement?
Thanks!
Part Number:DRV8312
Hi Team,
The customer would like to use DRV8312. The customer would like to use one output channel of DRV8312 device to control the coil voltage through PWM
The customer's application is the Automotive Magnetorheological Semi - active Suspension System. He needs to control the coil current in the magnetorheological
damper to control the strength of the magnetic field.
Can DRV8312 be used to control the coil voltage? If DRV8312 cannot be used to control the coil voltage, would you recommend a suitable IC or a good
solution?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
Part Number:DRV8701
Hello,
I was curious about using this chip to run a 90V DC motor even though it's max voltage is 47V. Would I be able to set the ground voltage for the chip to about 70-80VDC and run the motor (given that VM is @ 110VDC)? I'm under the assumption if I were to do this that the Rsense (and other features) wouldn't work properly, is this a correct assumption?
Thank you,
Mat
Hi,
I am exploring the products for asymmetric bridge circuit for Switched reluctance motor control. I want to know about the products related to p channel n channel dual MOSFETs rated at 60 V and 5 A current. Also is there availability of integrated driver for the above module. Also can be the p channel and n channel Mosfets of the same IC be connected in seriec with load winding? Gate voltage supply range 15V
Part Number:DRV8701
Hi,
I have a product that is to use the DRV8701E for many different applications and different motor ratings. I have a fixed sense resistor of 0.005 Ohms that I calculated for the maximum Ichop of 50 A.
Ichop = (Vref-Voff) / (Av x Rsense) assuming I want a 50A max, 5V microcontroller, Av is 20 and Voff is about 10mV, I find that Rsense is 0.005 Ω (@ 5 Watts).
I have 3 different motors I’m using this design on @ 31 Volts (Bridge rectified AC), with a software adjustable Vref.
So I was under the assumption I could use the Vref to limit the maximum current of the motor and prevent damage to the MOSFETs.
I made a table and graph of all the different software to voltage values that I’ve included with this data.
If I use the 588W Motor @ 31V I should expect a max current of 18.9A. This gives me a Vref of 1.91 & a PWM setting of 96/255. This motor runs fine and has a slight increase as it should. The 115 watt motor runs fine as well when set to the correct Vref.
The problem is the 160 Watt Motor I’m using should have a Vref of 0.54 V. This gives me a PWM setting of 26/255. The motor is in a screw drive reducer but fails to run, being limited at this value of Vref. Even if I set Vref to 96/255 like the large motor it still fails to run. If I set it around 150/255 ~ 3 volts I can just get it to run!
So what I’m gathering is that Vref doesn’t seem to be an Average current cutoff but it’s only an instantaneous value, is this correct? This makes me afraid of the 588 W motor under load as well (but it will draw 10A with the correct Vref Setting)
Any additional information you would like I will happily provide.
Thank you,
Mat
Part Number:DRV10983
Hi all
Would you mind if we ask DRV10983?
<Question1>
On the I2C speed control, Maximum Velocity is 51Hz.
-MotorSpeed1 = 0x01;
-MotorSpeed2 = 0xFF;
-Velocity = 512 (0x01FF) / 10 = 51 Hz
-SpeedCtrl1 : 0xFF, SpeedCtrl2 : 0xX1
In case of speed control between Analog input and PWM, is Maximum Speed Command the same value 51Hz?
<Question2>
If our customer would like to use RPM=4500 with pole=4, we guess that it is impossible, isn't it?
Kind regards,
Hirotaka Matsumoto
Hi!
I've two dunkermotoren (3-phase) BG31 with hall sensors and one mvl BG3612.
My question is now which motor drivers I need to drive the motors. I'd like to use it with my Raspberry Pi.
I'll attach all the information I have.
(Please visit the site to view this file)
Part Number:DRV8842
Hi Team,
The customer is using DRV8842. When OCP occurs, the nFAULT outputs a low level. The customer would like to use this low level signal as a detection
signal in his design when the motor stalls. But he sets the ICHOP value. He made the mistake of ICHOP as the overcurrent value.
When he set ICHOP is 3.3A, then the motor stall current is test 2A. When he set ICHOP is 0.66A, then the motor stall current is test 0.5A.
I would like to confirm the following information:
Q1: The OCP value is 6A. This value cannot be changed. Is my understanding correct?
Q2: What is ICHOP? Is ICHOP the output current for DRV8842?
Q3: Is the customer's idea correct? I don't think the customer use this low level signal as a detection signal.
Q4: Why is the motor stall current less than the ICHOP set value?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
Part Number:DRV8881
Hi,
I do not understand clearly the specification of PWM offtime in the datasheet and specifically the logic low/logic high numbers that are typically 20usec/30usec.
How can they be consistent with an application that uses the driver at 100Khz(10usec period)?
Thanks
Umberto
Part Number:DRV8871
Hello there!
I'm currently working on a battle robot's motors control and I was thinking of using the DRV8871. But, since the motor we chose for the robot (a beetleweight, 1.36kg) has a stall current of 5.6A and probably peak currents that far exceed such value, the DRV8871 isn't able to properly supply it.
Therefore, I'd like to know: is there any equivalent IC to the DRV8871 that supplies higher currents or should I amplify my current signal?
Thank you all in advance!
Part Number:DRV8432
Hi,
I intend to use DRV8432 chip to run stepper motor in microstepping mode. I've reviewed DRV8432 data sheet but found no information on how to set up a microstepping mode. It's my understading that in order to do so I have to set up the chip for cycle-by-cycle (CBC) current limiting mode and be able to adjust OC threshold externally by using voltage DAC or otherwise. I looked up through this forum and found reference to DRV8412-C2-KIT that is capable of microstepping mode. I've then checked the schematic diagram of the driver board included with the kit and found that the circuit contains PWM DACs and allows for external OC threshold control. However, it's not clear so far as to how to choose the DAC's output voltage and OC_ADJ pin's resistor value for a given desired OC threshold value. The description of current limiting function in the DRV8432 datasheet is very limited and skimpy and it's insufficient to gain full understanding of circuit's functionality. So my questions are as follows.
1. Would you please provide a more in-depth explanation of current sensing and OC protection functionality, perhaps, with detailed block diagram of the circuitry involved?
2. Would you please provide a formula that accurately describes functional relationship between DAC output voltage, external OC_ADJ resistor's value, and desired OC CBC protection threshold?
3. What is the typical response time of the DRV8412 to the changes on the OC_ADJ pin?
Michael
Part Number:DRV8880
Hi,
I want to use the AutoTune feature of DRV8880 with a stepper motor with 5 A current(RMS). Is it possible to use external MOSFETs driver with DRV8880 for use with higher stepper motor currents as the internal driver is limited to a maximum current of 2 A ?
Also is it possible to set the micro stepping to 1/256 instead of 1/16th, in firmware just like DRV8711 ?
As per my understanding, DRV8711 does not have the AutoTune feature which is available in DRV8880. How can I get both features, AutoTune and 256 microsteps, for 5 A stepper motor drive ?
Please advice.
Best Regards.
Part Number:DRV8711
Hi,
One of my customer willing to use DRV8711, but they do not want SPI control.
I'm afraid the DRV8711 can enable and work normally without SPI line.
But only related thread I found from E2E is below.
( https://e2e.ti.com/support/applications/motor_drivers/f/38/p/573994/2105671#2105671 )
the result of above thread is use SPI1.
Is it possible for DRV8711 with only Optional STEP/DIR Pins?
If then, how can I disable SPI controls? just make low pin 16?
thanks,
TS
Part Number:DRV8825
I am designing a custom controller board for controlling steppers on a telescope mount. For my initial prototype (Rev A) I used two Pololu DRV8825 Stepper Motor Driver Carrier boards plugged into a custom board design. This prototype drives two 1.5A NEMA 17 bipolar steppers and works very well.
I designed a second board (Rev B) using three DRV8825 devices mounted directly on the board and I am experiencing erratic motion on all three motors and see some serious irregularities on the current waveform as shown below. This trace was captured while in full step mode with a step rate of 40Hz. to a single NEMA 17 stepper. The corresponding trace of the Rev A system looks good.
In looking further into the problem I also see serious irregularities in the PWM waveforms for both A and B outputs as shown below. Again, the corresponding traces from the Rev A system look normal.
Details of the Rev B design are:
The board as tested differs from this schematic as follows:
I realize that much of the layout is not according to recommendations. After reading most of the DRV8825-releated posts on this forum I realize that much needs to change here. Previously I had not seen the EVM so I will use it as a model for the next rev.
I have tested all three DRV8825's on the board and they all show this behavior. Has anyone seen anything like this in the past? Is there anything in the information here that would point to a possible cause? I will be redesigning the board in any case but I would like to have an idea of what caused this before I do that. My only theory at this point is that my solder reflow method resulted in the devices getting too hot and being damaged. It seems unlikely to me that all three devices would be damaged in the same exact way however.
Part Number:DRV8801
I am using the DRV8801 with a total of 50K load resistance on the VPROPI output pin, with the resistance the voltage is reading 1.31V ( this is not 5X the current) if i remove the resistance I am getting 2.0V ( this is the 5X coil current). It seems that the pin has an output impedance I am exceeding but I can not find anything in the datasheet. What is the max load that this pin can drive accurately?
Thank you,
Sheldon
(8801_VPROPI_OUT is connected to an ADC)
Part Number:DRV8871
Hello,
Regarding to IN1/2(logic input) on DRV8871, my customer is asking a question.
(Question)
･How is rise time and fall time in IN1/2?
I am understanding that generally, the maximum rise time and fall time of CMOS logic(Vcc5V) are approximately 20ns/V.
Is it same as above value?
They use very slow rise time and fall time(20us~) signal as IN1/2 and they are facing the anomalous oscillation on this device output.
Regards,
Tao2199
Part Number:DRV8332
There appears to be no evaluation module available for mounting and testing of the DRV8332. We are interested in interfacing it to a brushless DC motor and performing some rudimentary tests. Your suggestions on alternative ways to accomplish this desired task would be greatly appreciated. Thank you.
Part Number:DRV8308EVM
Is it possible to use Back EMF instead of Hall sensors on the DRV8308? Perhaps a biasing circuit and comparator on each phase?
The DRV8308 seems perfect for our design, but most low-cost BLDC motors do not have Hall sensors built-in. Retrofitting Hall sensors (DRV5813) is a possibility, but not ideal.
hello,
I am trying to find a motor driver to the FAULHABER 0308 sensor-less BLDC motor that i am using.
(Please visit the site to view this file)
i want to be able to spin the motor in 40000 rpm with a motor voltage of 5.5V
i have already purchased your DRV10963 motor driver , but it didn't spin the motor well.
i tried all the parameters there but it didn't reached even close to my desired RPM. i think that the problem was that the driver was not able to pass from open loop to closed loop because the BEMF in low RPM was hard to read.
do you have any recommendations for another motor driver that will be to handle that motor ?
thanks - SAM