Hi Cole-san,
Thank you for your prompt reply.
I understood and will contact you if I get additional questions from our customer.
Best regards,
Kato
Hello James,
our customer would like to ask another question about that driver.
Is there any “OC Latch Mode” In the “1PFB” configuration (Mode Pins set as 0 1 0) which could be adjusted by “’OC_adj” resistor?
Best Regards.
Vitali
Part Number: DRV8432
Hello,
I've got a question about "FAULT_N" Pin from DRV8432. When the driver is in the cycle by cycle mode (18.7A, two DRV8432 in parallel mode), we see some fine "Low" peaks on the "FAULT_N" output while that pin remaning "High". Radj=24K. Is that behaviour from "FAULT_N correct?
Best Regards.
Vitali Lach
Part Number: DRV8703-Q1
Dear, Sir.
The design at my customer side using DRV8703-Q1 is proceeding well.
So they have started the reviewing of functiions which DRV8703-Q1 has.
The question is /FAULT & /WDFLT state during Sleep mode.
I suppose it will be OPEN(Hi-Z) state because open-drain structure, but
I would like to double-confirm that.
Sorry to ask about this kind of matter, but please give your advice.
Best Regards,
H. Sakai
Part Number: DRV8814
HI DRV team,
My customer have a question.
They want to control the decay mode with synchronizing AENBL. (It have a few delay time. )
DECAY = L (Slow decay mode), At AENBL=L
DECAY = H (Fast decay mode), At AENBL=H
(Background)
At AENBL=H, they want to set low current limit(under 0.35A). If the decay mode is slow decay, motor current didn't decrease to current limit..
Also, They want to use brake mode at AENBL=L(stop motor).
Part Number: DRV8313
Hello,
If we want to pass EFT/Burst tests do we need to put extra TVS diodes on the motor phases(Outputs of DRV8313)?
What is the proper TVS diode then? I can't find proper TVS diode suitable for 48V motor and clamps 65V.
Do we need to pass this standard tests when motor and driver are close to each other with short cables ? which protections should be considered with this chip?
Thanks in advance.
Part Number: DRV8313
HI,
I have been successful driving a DRV8313 with multi wheel robotics using Gimbal motors like the small ones found on quad copters. Currently I use an ESP32 and a table array to create the waveforms needed for the drv8313. This works ok but I would like to try and improve the smoothness of the drive and increase speed and torque.
The esp32 datasheet
https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
I guess I am looking to measure some BACK EMF of the motor coils and use it to adjust the phase skew in an attempt to reduce some cogging.
Im looking for advice suggestions for components to have some sensor feedback to a Microcontroller.
I could probably write the software if I had a general idea of how to also setup the hardware. I have a number of free input GPOI0 pins to read voltages.
Any how i have looked through most of the internet for quite some time to get to this point but I am stuck
Any help greatly appreciated also if you ask questions I will try to be quick to respond.
Cheers
Adam
Part Number: DRV8308
Hello,
We are trying to use the drv8308 with closed loop operation. After a few days of testing we were able to get the drive to work with different voltage and motors to simulate manufacture variance. Now we need to be able to determine how 'loaded' is the system so we can report that our product is not within the predefined production tolerance.
It is possible to read the resultant gain when working with Clock Frequency Mode trough SPI? If not, what is the alternative? Or it is not possible?
Thanks
Part Number: DRV8308
We are having trouble limiting the startup current with Clock Frequency Mode.
Our startup can peak as up as 24A depending on motor and input voltage configuration (24V+-10%)
According to the data sheet, the SPEED register should adjust the open loop gain before Lock, but in our tests it actuality apply a gain in CLKIN resulting in a lower speed after LOCKn, and do not affect to the start current.
Our Risense is 0,02 ohms
Here follow a 17A peak example, best result reached so far:
Our register configuration:
drive,speed_mode=<0>; /* closed loop mode*/
drive,pwmf = <2>; /* external FET Pwm frequency 100Khz*/
drive,fgsel= <1>; /* xor all 3 hall sensor */
drive,aa_setpt = <5>; /* ~95Hz */
drive,ag_setpt = <7>; /* ~382Hz */
drive,advance = <43>; /* ADVANCE */
drive,minspd = <5>; /* Minimal speed for lock */
drive,spdrevs = <20>; /* Hall Us required for lock */
drive,mod120 = <3970>; /* fixed for closed loop mode */
drive,intclk = <5>; /* Integrator clock */
drive,spdgain = <11>; /* closed loop gain */
drive,filk1 = <1200>; /* FILK1 */
drive,filk2 = <950>; /* FILK2 */
drive,cmpk1 = <280>; /* CMPK1 */
drive,cmpk2 = <560>; /* CMPK2 */
drive,loop_gain = <240>; /* closed loop gain */
drive,speed = <2000>; /* open loop gain ???*/
SPI write debug to confirm the data:
reg00 = [71] [84]
reg01 = [00] [2b]
reg02 = [14] [05]
reg03 = [6f] [82]
reg04 = [01] [43]
reg05 = [50] [0b]
reg06 = [04] [b0]
reg07 = [03] [b6]
reg08 = [01] [18]
reg09 = [52] [30]
reg0a = [f0] [f0]
reg0b = [07] [d0]
reg2a = [00] [00]
Any Idea to what
I am designing a moving magnet actuator for nano positioning application and need a linear servo driver that could operate it in the current mode. My requirements are - Current driver that could run a 400 mH and 21 ohms coil in the actuator at a current closed loop bandwidth of 1000 Hz and has a noise floor of 10 nV/sqrt(Hz) or 10 micro volts rms till 1 MHz or lower noise floor. I am also want the driver to give at least 2-3 A continuous current. Does TI have any current driver that meets these specifications.
Part Number: DRV201
Hi,
I just run into some trouble using the DRV201 driver to drive a VCM for a research project.
With the DRV201 evaluation board, it worked completely fine through the full range, However, once I switched to my own DRV201 adapter board, the driver fails at ~400 normalized VCM current. Beyond that current, when I update the current output, the driver will try to raise the current and rapidly drop to 0. No error is reported from the registry.
I have tried quite a few different things to solve the problem (soldering technique, PCB spec and capacitor location), but the error kept happening. The board is extremely simple and almost identical to the evaluation board. I have not clue how to troubleshoot. At this point, any insight or suggestions will be helpful.
Some additional comments:
I just figured that above ~400 normalized current, the driver actually reset it self whenever I setup an output current. PWM/Freq settings are all reset to default. Without any VCM connected, the device reports a no connection error at any voltage output, which indicates no short connection.