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DRV11873: If the motor has a low-speed reversal, the current will generally be larger (basically around 700ma), the chip is a little hot
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DRV8701: DRV8701P Delay issue
Part Number:DRV8701
Dear TI:
Waveform and SCH.(Please visit the site to view this file)
Ver .A the circuit works normal.
Ver B. Change MCU(p2p but more flash.) But the circuit can't work. the motor stop work.
Note: the sch and pcb layout are all the same.
from the waveform, it seems the decay time become longer.
how can i do to optimize the waveform ,and make the motor move smoothly. thanks
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back emf commutation/ sensor less commutation of bldc
sir, i need to commutate the bldc motor without sensors.i have back emf from terminals R Y B .but how would i take that emf to the controller.Because which has a 20khz switching frequency noise.from that how i detect zero crossings. can u help me..
thanks in advance
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DRV2510-Q1: Failure every 2 seconds
Part Number:DRV2510-Q1
Dear TI friends,
Using drv2510 to drive a little dc motor I get a failure interrupt exactly every two seconds, and the output power is cutted off.
I read the registers through I2C, and I get the fault bit at bit 4 address 0x02, but there is not fault details at address 0x01 (all bits are 0).
Could you give me a clue of what is happening?
Regards
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DRV8301: Overcurrent protection and VDS register settings
Part Number:DRV8301
Dear Engineers,
I am currenly busy with a redesign of a existing motor controller. The original design was based on a NXP/DRV8301 evaluation kit.
So most settings are same as this kit.
For my redesign I used another NFET: IPB083N10N3. Original we used NFET AOB290L.
In the end product, at first it seemed to work, but sometimes the motor stopped spinning. After looking into the issue; changing the VDS from default setting 0,06V to 20V seemed to solve the issue.
But are we really solving the issue? Since the connected motor doesn't draw that much current?
I try to get better understanding of this issue. Is it possible that the fet is not yet fully switched on? Or is it possible that a wrong dead time setting results in too high current flow?
Any advice how to test this further? Looking forward to your ideas.
Regards,
Richard
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DRV8303: I can not find file: Filter calculator.xls
Part Number:DRV8303
Hello. I can not find file: Filter calculator.xls in the slvc552f.zip software package to work with DRV3808EVM.
Tell me where you can download this file Filter calculator.xls. After installing the software package it is not.
Thanks for the help me.
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DRV8885: MIN and MAX Value of Internal Pulldown Resistance of EN Pin
Part Number:DRV8885
Hi, Team
My communication customer is using DRV8824 to drive stepper motor in RCU of Antenna. They want to upgrade DRV8824 to DRV8885. DRV8824 EN is active low, but DRV8885 EN is active high. As customer do not want to modify the software of current MCU platform, customer add a transistor circuit to invert the signal.
Customer want to get the MIN and MAX value of Internal Pulldown Resistance of EN pin. So they can select a suitable value of R1. But there is only typical value in datasheet.
Could you share the MIN and MAX Value of Internal Pulldown Resistance of EN Pin?
Thanks
Kevin
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DRV8308: I can not find file: Filter calculator.xls
Part Number:DRV8308
Hello. I can not find file: Filter calculator.xls in the slvc552f.zip software package to work with DRV3808EVM.
Tell me where you can download this file Filter calculator.xls. After installing the software package it is not this file.
Thanks for the help me.
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DRV8301: Low Inductance Motor Issues
Part Number:DRV8301
Hello,
I have a Maxon EC, 2 pole, BLDC Motor - Model Number 399263.
Some of the relevant parameters, as listed in the data sheet are:
Nominal Voltage [V] 24
No Load Speed [rpm] 55200
Max Continuous Torque [mNm] 14.2
Speed Constant [rpm/V] 2310
Rs (phase to phase) [ohm] 0.491
Ls (phase to phase) [uH] 29.1
I'm currently using the DRV8301-HC-EVM evaluation kit.
This is obviously a Low Inductance motor, so I've been trying to characterize it using lab02c.
It starts off just humming, while lab02c is evaluating Rs. Then it stops. Then it runs pretty
smoothly for a little while. During this period I can see the Flux value getting updated.
Finally, it goes through an interval where it's running extremely rough. I can see Ls_d
and Ls_q getting updated during this phase.
The numbers I'm getting for Rs are relatively close to what I'd expect (0.4xxx), but the Ls
values vary wildly from one run to the next. Flux usually shows up as around 0.006 V/Hz.
I can't get the motor to run at all in any of the subsequent labs. Maybe I've got some
crazy values somewhere. I've attached the user.h file.
Could you please help?
Thanks,
Dave Reagan
(Please visit the site to view this file)
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DRV8816: Driver output not being pulled low
Part Number:DRV8816
Hello,
I am using the DRV8816 Motor Driver to control a 24V Brushed DC Motor (inside of a linear actuator). I am noticing issues with low side not being pulled low all the time.
In the first case, I have both EN lines pulled HIGH (3.3V). I have IN1 LOW (GND) and IN2 HIGH (3.3V), so I expect OUT1 to be LOW (0V) and OUT2 to be HIGH (24V). However, I notice that OUT1 will pulse HIGH at times. See first picture and second picture for a zoomed in view of the pulse. OUT1 is yellow and OUT2 is green. The motor will still drive, but I am wondering why is this happening? And is there anything I can do to get rid of this effect?
As a followup, I also tried to PWM the inputs and the behavior is even more noticeable. Again I have both EN lines pulled HIGH (3.3V). In the first picture, I have IN1 LOW (GND) and IN2 being PWM (0V to 3.3V) at a 50% duty cycle and 10kHz frequency. You can see OUT2 is being PWMed as expected, but OUT1 is pulsing HIGH at the same time OUT2 goes HIGH. In the second picture, I have IN1 being PWM (0V to 3.3V) at a 50% duty cycle and 10kHz frequency and OUT2 LOW (GND). Again, OUT1 is being PWMed as expected, but OUT2 is pulsing HIGH. Additionally, if I increase the frequency of the PWM signal that seems to increase the period the time the outputs pulse high for.
Can anyone explain to me what is happening and how to solve this issues?
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DRV2510-Q1: Overtemperatur fault @ 300mA load
Part Number:DRV2510-Q1
Dear team,
could you help me with the following issue?
Using the DRV2510 with a load below 200mA everything works as expected.
When the DRV2510 is set to drive around 200-300mA into the coil (or more), it works for close to 1 second, detects and reports an over-temperature and enters load diagnostics mode, and resumes to working around 1 second later, and so on. When touching the chip it feels almost cold.
Some additional information:
VDD =15.4V.
The logic is at 3.3V (EN pin for instance).
Between the coil terminals is a simple coil used as an actuator in series with a negligible sense resistor.
Using less input decoupling than what the DS recommends, but a test were it was increased did not solve the issue.
Attached below is the a shot of the schematic and PCB the DRV2510 is used in.
Looking forward to your feedback.
BR, Nico
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DRV8662: May we have process input 3.3V 500KHz sinwave and output boost to 65V 500KHz sinewave?
Part Number:DRV8662
Hi Sir
May we have process input 3.3V 500KHz sin-wave and output boost to 65V 500KHz sine-wave?
Bogey
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Calrification about DRV88XX product line
Hi TI,
I'm trying to understand why is there a separate DRV880X family for unipolar stepper motors?
Aren't DRV882/3/4X families for bipolar stepper motors also work with unipolar?
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DRV8323: VGS Ring Problem of MOS Tube in DRV8323S Motor Driving Circuit
Part Number:DRV8323
Hello everyone:
When my DRV8323s motor drive circuit accelerated to over-current protection, VGS of MOS tube had a series of ringing after PWM control drop edge. I don't know what happened. This problem has led to errors in chip gate drive and motor shutdown.
TI's demo board also rings with the same configuration, but it's not as big as mine.
My register configuration is overcurrent protection 10A, MOS tube pull current 1A, fill current 2A, using NMOS CSD18533, current sampling resistance 50mR;
The waveforms before acceleration are clean, and there will be rings in several PWM cycles just after acceleration, until DRV8323 detects the grid drive voltage error and stops the motor control.
The internal waveform of the image is the VGS grabbed from the tube on the A bridge.
Here is the waveform captured by the oscilloscope
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DRV8350H-EVM: running this board from a raspberry pi
Part Number:DRV8350H-EVM
How do I run this board from a raspberry pi? I can use software like "device monitoring studio" to capture the commands going back and forth, but all I see are hex and I would need to decode these. Is there a way to run this board via python commands? how do I figure out what exact commands are being sent via usb?
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DRV10987: Over Temperature Warning Action Failure
Part Number:DRV10987
I am using DRV10987 for 12V DC Fan application.
And operating at 2+ A current most of the time.
DRV gets heated because of the high current.
There is a feature in DRV10987 regarding 'Over Temperature Warning'.
One can take action after over temperature warning has occurred.
Thus I have set the Current Limit to 1A on warning.
But current is not getting limited to 1A despite Over Temperature Warning Bit has set.
What might be going wrong in this case?
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DRV8313: Question about EN and IN pin issue
Part Number:DRV8313
Hi team,
When my customer use DRV8313 device in sleep mode, EN and IN pin could receive the input logic signal normally. However when use in normal mode (pull up sleep pin), the IN and EN pin could be always low voltage and PWM control signal could not be generated. NFault pin is always low voltage. And customer tried to reset and release reset through RESET pin, but the issue didn't go away. Could you please help to provide any other debug ways? Thanks a lot!
Best Regards
Zhengquan Lu
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DRV8320: About the concern, if it use for brushed DC motor.
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DRV8818: About the motor noise
Part Number:DRV8818
Dear Expert,
My customer have application problem about DRV8818, please kindly help.
They are using DRV8818 to drive a step motor, the spec of motor as below:
The circuit as below:
Software set to 7000pps, the motor rotate form position A to position B need 1200 pules. The problem is the motor has making acoustic noise, even the motor not running.
The current curve of one phase as below:
When the motor not running, it still making noise, the voltage curve as below:
They have tunning the VREF, but doesn’t have any improvement. Please help, Thanks!
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DRV8873: Capacitor between CPH and CPL
Part Number:DRV8873
Hello,
Our customer use the DRV8873H.
The customer worry about poor supply of capacitor parts. Especially, the parts that its size as larger than 0603 are rare.
They use the DRV8873H with 24V VM. So, they are looking for over 35V tolerant parts.
The capacitor of 35V tolerant and 47nF, there is only large size parts.
Do you have any idea?
Best Regards,
Naoki Aoyama
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