Part Number: DRV8821
Hello,
Attached is a picture with the design of the DRV8821. It is connected to a microcontroller. J4 and J7 connect to 2 bipolar stepper motors.
The signals provided by the microcontroller are as follows:
STEP=pulse
DIR=0
ENBL=0
USM0=0
USM1=0
DECAY=1
RESET=1
0=logical level low; 1= logical level high. Pulses are applied but the motors do not react. It looks to me like the device is in disabled mode.
Part Number: DRV8353RH-EVM
Tool/software: Code Composer Studio
We are using 32V - 15A e-cycle motor (comes with 3 hall sensor) with Instaspin. I have updated user.h parameters as per motor specs.
Is there any way to increase torque per ampere in sensorless? In lab4 it becomes torque control drive. Thus is it possible to merge speed control as well torque control in any instaspin lab.
Do suggest some ways to increase current limit. Is it like , in sensorless we cannot achieve maximum torque per ampere?
Part Number: DRV8343H-Q1EVM
Hello TI team,
i have detected EMC abnormalities in the DVDD Linear Regulator area. RF-Emissions - Measurements at the artificial network (AN) is failed.
We do not used external DVDD 3.3V, so I ask. Can I install a resistorin series with the capacitor 1µF, to reduce emissions? If so, what value?
I would be very grateful for the possible solutions.
Part Number: BOOSTXL-DRV8323RS
I am trying to prove that TI reference designs are viable for my company and am having difficulty commutating the BLDC motors we have on hand. What motor(s) are reecommended or have been proven to work with the BOOSTXL-DRV8323RS and MSP-EXP430F5529LP?
Part Number: DRV8308EVM
Hi Team, We need to measure the Back EMF of the 8 pole, 3-phase BLDC Motor. We have the DRV8308EVM board and would like to measure the Back EMF of the Motor. Kindly let me know what are the best means/circuit to find it. I have attached the phase output waveform of 120 degree standard Trapezoidal and 180 degree Sinusoidal commutation of the Motor.
Motor Supply voltage: 24V
Part Number: BOOSTXL-DRV8323RS
What are the highest power motor(s) that are recommended or have been proven to work with the BOOSTXL-DRV8323RS and MSP-EXP430F5529LP?
Part Number: DRV8872
Hello,
I am using the DRV8872 motor driver to drive a brushed DC motor. Although the motor driver is driving the motor, I am observing bad signals on the motor output line and want to know what is causing this in case it is indicative of an underlying issue.
Here is a scope image of what I am seeing. Blue is one of the motor output lines and pink is the corresponding motor input line (It is the same for the other set of input/output). The motor input is being PWM driven at 20kHz frequency and 25% duty cycle.
If you zoom in, you can see the motor output line exhibits many weird behavior on rising and falling edge.
Is there any explanation for what is causing the motor output signal to look like this? Or suggestion for improvements to correct the behavior.
Thank you.
Part Number: DRV8837
Hi team,
Does DRV8837 have installed dead-time control in brake mode ? It seems to cause a short circuit by putting high levels into both IN1 and IN2
Thank you!
Part Number: DRV8353
Hi Team,
my customer need drv8353 to drive mutiple MOS on each phase to get large output current, is this workable for drv8353? Do you have some document or guideline on this?
Thansk very much.
Regards, Sunny
Part Number: DRV8305-Q1
Hi Adam,
We are currently using the DRV8305NEPHPRQ1 in BLDC automotive application. We need a response ASAP. Please respond in a timely manner.
It appears Pins 29-32 are damaged internally on the chip. FETs for both the High side and Low side of the MOSFET Bridge circuit that connect to the pins seemed to be OK when isolated tests are performed for this phase of the motor.
Are there are any electrical measurement checks we can do, from our end, on these pins to verify the pins are functioning properly as we measure low resistance for that phase of the leg of the 3 phase motor. We would like to send over the DRV8305 to TI to analyze. If there is anyone at TI we can reach out directly to that would be great.
These tests were performed when running a high temp soak test (at 150C) with the load changing in a step wise pattern for the Motor. Our unit is failing now and everything is pointing towards these pins even after the unit is power cycled at room temperature. We are looking at all the possibilities where the DRV8305 maybe malfunctioning or the pins 29-32 are failing. The DRV8305 is being used in all our current units.
We are speculating that the charge pump on the DRV8305 may have been damaged in the process as well. The datasheet specifies the caps as 0.047micro Farad. Could you specify what the tolerance range for the charge pumps caps are?
Kindly provide any supporting information or what this error seems to suggest.
Best regards
Mohammad
Part Number: DRV8860
Hi,
I'm trying to identify a low-side relay/solenoid driver suitable for new designs. Our requirements for the entire solution are listed below. Based on the required number of loads, it's OK to use multiple devices in daisy-chain configuration.
1. Maximum load voltage - 32V dc;
2. Maximum continuous load current - 300mA;
3. Number of loads - 16;
4. Device interface - SPI;
5. Product availability - 10 years minimum.
So far we've identified several products that may or may not be good candidates and mostly focused on DRV8860 and DRV8804. With all of their Yay's and Nay's they are reasonably acceptable options for us in general, provided that they meet requirement #5 above. Unfortunately, we couldn't find any information about product longevity program on TI's website (please note that some other manufacturers do have such info publicly available). Our questions are as follows.
Q1. Are DRV8860 and DRV8804 recommended for new designs?
Q2. What is expected longevity of DRV8860 and DRV8804 based on current demand for these products?
Q3. Could you please recommend some other devices that would fit our design profile based on requirements 1 through 5 above?
Q4. As a possible future option, it would be desirable that suggested devices are capable of providing control for proportional solenoids. What TI devices would be able to offer that functionality? Please note that these parts would have to meet the longevity requirement as well.
Thank you for you support.
Regards, Michael
Part Number: DRV8880
I am driving a simple stepper motor in my application at 100% torque. To reduce heat and wear, I dial back TRQ to 25% between motor movements.
When I drive the motor normally, everything seems fine. However, if I attempt to issue a single pulse to the driver (in any step/microstep mode) the motor doesn't step! I did notice though, that if I issue 2 pulses, the motor successfully moves each time. (This is true in each step mode) Furthermore, when I completely remove the code that sets the 25% holding torque, single-pulse movements work as expected.
Finally, I probed my STEP pin and triggered a capture on the falling edge of TRQ0 (setting torque from 25% to 100%). I measured 10µs between the falling-edge of TRQ0 and the rising-edge of STEP. There are no timing requirements in the datasheet regarding the TRQ pins, however. But perhaps TRQ isn't meant to be used like this or there is actually a setup time required before stepping?
I actually have three motors in my system, all driven with 8880s, using almost identical code (so I know it's not a firmware issue). The other two motors are set to TRQ 25% for 100% of the time and the issue does not arise at all. They are able to move using single pulses.
Has anyone seen anything like this?
Part Number: DRV8885
Hi App
DRV8885 and DRV8886 are pin compatible?
Does it move as usual just by replacing DRV8885 to DRV8886 on the board?
Thanks
Yuki
Part Number: DRV8834
Hi team.
If I don't use Vint pin , could you tell me how to processing for Vint pin ?
Sincerely.
Kengo.
Part Number: BOOSTXL-DRV8305EVM
Tool/software: Code Composer Studio
Dear all,
I'm using 28069m launchpad with drv8305 boosterpack and motorware. In the project lab source code, I cannot find any code snippet that assigns the value of dead time for the drv8305 boosterpack explicitly. So I assume that the drv8305 boosterpack is operating with the default dead time value specified in the datasheet as 52 ns. Is this correct ? Note that I change the value of HAL_PWM_DBFED_CNT and HAL_PWM_DBRED_CNT to 90.
Regards,
Nantawat.
Part Number: DRV8343H-Q1EVM
Hello,
I am trying to understand from the datasheet and the user guides, is it possible for me to spin a three phase sensored motor with sinusoidal commutation instead of trapezoidal commutation?
Additionally, I would like to understand how the trapezoidal commutation is created and what creates it (firmware on the MSP430F5529 or the DRV8343-Q1). I see the trapezoidal commutation first when I connect with a scope to one of the GHx outputs but I did not understand how it is created and why I see a different wave on GLx outputs.
Please feel free to elaborate.
Thank you!
Eli
Part Number: DRV10983
Dear colleague,
Our customer is evaluating DRV10983, below is their schematic, but after powering up, DRV10983 VREG is no output.
Could you please help us to solve this issue?
Best Regards,
Rock Su
Part Number: DRV8837
hello,
i'm new in hardware development and i have some problems with the datasheet, so there we go
i'm designing a latching relay driver using DRV8837 and a single coil 3V latching relay, but the logic voltages mentioned in datasheet for IN1 and IN2 confuses me.
How can i find the maximum low voltage and the minimum high voltage for IN1 and IN2?
thanks for your help
ps. google translate helps me with this question, so ignore the mistakes
Part Number: DRV8704
Hello,
I am seeing some odd behavior with bridge A of my DRV8704. When firing coil A at the same chopping current in the "on" direction the high and low gates PWM frantically. As a result I get a slightly lower average current to my load. Firing in the "off" direction, all four gates are completely on as expected and current is limited by the load resistance. My circuit is current limited by the resistance of the coil well below the commanded chopping current. I only write to the torque register and leave the 4 data MSBs set as 0's. I still noticed this issue when commenting out the code writing the Torque register. All other registers are left as the default values. I do not see this issue using the same load on coil B in either firing direction.
/cfs-file/__key/communityserver-components-mult/cfs-file/__key/communityserver-discussions-components-files/38/Coil-Controller-Rev-1.brd
My scope plots have 3 channels captured in them. Ch1 is a trigger signal from the controller's MCU to trigger the oscope. Channel 2 is a current probe clamped to the load coil. Channel 3 is the gate signal.
On Pulse A1HS gate signal.
On Pulse A1LS
On Pulse A2HS
On Pulse A2LS
And an image of the off pulse for A2LS to show it isn't toggling and the difference in delivered current to the load.
Any suggestions? In my application, I need the maximum current in order to get the actuator to fully travel. That slight degradation in the on-pulse is enough to make the actuator unreliable. Any suggestions hardware or software would be greatly appreciated. This hardware has already been delivered to my customer, I'm hoping a quick software change will fix it.
Part Number: DRV8305-Q1
Can someone from TI list the most likely causes for AVDD to read 0V when DRV-83055 is installed on a circuit board whose schematic matches the DRV-8305EVM boosterpack in the vicinity of the gate driver chip, e.g. AVDD, VDRAIN, etc passives are all the same values (some caps have higher voltage ratings but same capacitance)?
Thanks,
Bob
