Part Number:DRV8837
Hi
I am currently using DRV8837 to drive one motor. Is there any cost effective solutions to drive four motors. But all the four motor need not be driven at same time ?
1.Is there any way to connect only one Motor Driver IC to drive all four motors parallel.
2. I have limited no of IO to drive Motor Drive IC.
Regards
Pavaman. P
Part Number:DRV8301
Hi Team:
My customer is using DRV8301 in their project. And some chip will show GVDD_UV ERROR. And test find the GVDD volatge is only 3.3V. And we verify the pin impedance and find that the GVDD to GND is only 10ohm. Could you help to analysis what will casue the GVDD_UV. After repalce the new one, the board can work again. If the chip is failure, it should be failure at the first time.
Hi Everyone,
I have a question related with Encoder speed measurement. I have a quadrature encoder in my system and I read the speed successfully. But there are only 60 teeth on motor side. Therefore I have little problem while reading low speeds and this problem affect my motor control at low speeds.
I am using f28377d in my control card and I am trying to control Induction Machine with v/f control. Does anyone have any suggestion to improve the control at low speeds?
To read the low speeds successfully, I tried to make register change in my control loop i.e. I set the QCAPCTL.UPPS register to 2 at start , and then change it to 4 when it goes over 120rpm. But in c2000 forum it is said that it is a bad idea that change the register dynamically.
Any comment would be appreciated.
Thank You
Part Number:DRV8829
Hi Sir
May we know I0-I4 pin function?
if we depend I0~I4 to set output chopping current.
if we set full-scale (100%) is 2A. I I0-I4 set 0x02h(10%). then output current will cut off when output current over 0.2A.
Is it rught?
Bogey
Part Number:DRV8803
Dear Support Team,
I have some question regarding DRV8803PWP.
Best regards,
Hiro Takahashi
Part Number:DRV8301
Hi, I have DRV 8301 designed with circuitry same as given in reference design of its datasheet.
I have not connected 22 uH inductor to the circuitry as it was causing high current issue for microcontroller as %v from microcontroller was connected to Vcc end of inductor.
Rest of the circuitry is same except inductor is removed. The I applied PWM to all the 6 pins of DRV8301 then I observed that no PWM out at any GH_X and GL_X is working. While debugging I found that GVDD pin has 0V always. And nFault pin is low and OCTW is high.
And PWRGD is low, nFault pin is low and OCTW is high. This indicates that there is shutdown due to low voltage as GVDD low status indicates the same. Also no MOSFET related circuitry is connected to DRV8301.
Why is GVDD low all the time? I have just connected 2.2uF to GVDD to ground. Also IC gets heated ver quickly to temperature of 100 C. I don't understand why this is happening, Any ideas!!
Part Number:DRV8305-Q1
Hi Sir,
My customer uses DRV83055-Q1 in water pump, two question need to be answered, thank you.
1. Operational temperature
In customer's board, the DRV83055-Q1 shows ~70 ℃ at the top surface in below condition, and it means the operational maximum ambient temperature is absolutely limited to ~80 ℃? Could you give me the maximum ambient temperature our EVM can work with? EVM's DRV8305N show ~60 ℃ in the same condition.
Condition: 1) Room temp; 2) Connected to MOSFET, but without motor; 3)12V input; 4) LDO load ~7mA
2. Current sense amp
Could we use one of the current sense amplifier to sense the low side total current as below?
Best regards
Hi team,
The customer needs to select the stepper motor driver IC to drive the unipolar and bipolar stepper motors for the printer domain.
The power supply is 12Vor24V. The output current is needed to reach 3A.
Can you recommend one or two suitable IC?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
We are using Fairchild Semiconductor KA3100D IC SOP-16 SMD Package in our medical products with annual consumption of 1000. Currently this IC is EOL now (Year 2008)
But since it is used in regular production, we need 1:1 pin compatible TI equivalent for same.
Kindly let us know for alternative.
Link for KA3100D: http://pdf.datasheetcatalog.com/datasheet/fairchild/KA3100D.pdf
Thank you in advance.
Vaibhav
Part Number:DRV8303
We are using theTMS320F28069MPZT and the DRV8303 and have a problem with the GLx (lower gate output drive) spiking up when there is a transition on the GHx signal (high side gate output) the result is high currents (3V/0.025 ohms = 120A!) flowing through. The Rsense in this circuit is 0.025ohms. Increasing the dead time has no effect on the GLx output drive spiking high. We had the boards x-rayed to confirm that the exposed pad of the DRV8303 was properly connected to the ground plane.
We then set up the BOOSTXL-DRV8301 board and it behaved similarly; high current spikes on the edges of the high side gate drive. We are very careful with our scope grounds and confirmed that what we are measuring is truly present.
For the following images, the FOC software was set in the RS Recalibration mode for Motor Identification. The motor isn’t spinning. However when the motor is spinning, these spike are still present.
DRV8303 GH Falling and GL Rising
DRV8303 GH Rising and GL Falling
DRV8303 GL Falling and Voltage on RSense
DRV8303 GL Rising and Voltage on RSense
Part Number:DRV8835
Hi, I have to control 2 brushed DC motor using DRV8835DSSR.
According to the datasheet, I don't see diodes inside except the diode mark at each NFET and PFET.
As far as I know, the DC motor causes inductive spikes.
Currently, I've configured my schematic like this. I use the CC3200 QFN MCU.
The DC motor draws 1A when 9V full duty PWM is inserted.
So, should I add diodes to the AOUT1/2 and BOUT1/2?
Part Number:DRV8711
Hey E2E,
I recently got a DRV8711 stepper driver board up and running. Today I hooked the stepper motor up to a scope with a current probe, because I was noticing some bad vibration at pretty much all speeds and microstepping modes.
I found that the motor's current waveform has a strange double peak, kinda like the microstepping indexer gets reset to a previous value after topping the peak. I'm sure that's not what's actually happening, but that's what it looks like.
This waveform was taken with 1/64th microstepping. The double peaks are present all the way down to 1/2 microstepping, as shown in the next waveform.
With microstepping disabled, I get a good square wave, as expected.
During this testing, I was reading through the 'DRV8711 Decay Mode Setting Optimization' app note. I was able to detune the driver to reproduce most of the issues listed, and then adjust it back to fix the issues, but through all this testing the only way I was able to get rid of the double peak was by bending the waveform so far out of shape that the motor squealed.
Has anybody experienced this before?
Part Number:DRV11873
Dear,
Our customers use DRV11873 to drive brushless motor. But they encounter problems: the motor can rotate with the current below 0.3A, but the motor shakes severely. When the current exceeds 0.3A, the motor stop rotating, the current displays as 0.7A. So please help check if the circuit or the parameters have problems, thanks.
Part Number:BOOSTXL-DRV8301
I am working with DRV8301 IC, I would like to create the simulation model of DRV8301 IC such as in simulink or PSIM etc. Is there any available information about this. Thanks.
Part Number:DRV8302
Drv8302 is limited to 60v is there a variant that will do higher voltages
iam trying to mod a 60v design to do higher voltages by changing out the mosfet. but the 8302 is a problem.
I can do a switcher to bring the 100v downto 24 but the sense voltages going into the drv8302 are still an issue. can I do a resistive divider to bring the sense voltages down to 24v?
what about the 24v vin going to internal switcher.
is there a better variation of drv802 with say external power supply that might be best solution
I use the DRV8711 for diving stepper motor,use the CSD88537ND for pre-drivers .The motor cann't work and the voltage in the stall is low .I considered configuration of the registers.But how can I do?
my stepper motor features :
2.8v , 1.68A , 1.8degree , r = 1.65 ohm , l = 4.1mH
Part Number:DRV8871
Hi ,
I was wondering if it is possible to monitor the H bridge current if I also connect a high impedance OP AMP (in series with the limit resistor ILIM pin) ??
Regards
Michael
Part Number:DRV8301-69M-KIT
Tool/software: Code Composer Studio
Hi all,
No real rush on this topic post, just really looking for some clarification as I'm pretty new to C.
I've followed the HAL tutorial and have the potentiometer on the board reading and then that value being used for iq_ IQRef so it controls current to the motor.
I also have SW1 and SW2 values being read in the Expressions Watch Window.
That is all working fine but to get the board to work independent of my laptop I would really like to make it that SW1 and SW2 latch, so that when you push the button it holds that state. I can do this in arduino where I learnt to code but struggling to implement in CCS.
Additionally, once latching, I'd like to make it that SW1 and SW2 toggle gMotorVars.Flag_Run_Identify and gMotorVars.Flag_enableSys on and off.
Any help provided would be greatly appreciated.
Part Number:DRV8301
We have deveolped our own hardware in a compact form. Basicly it includes all of the DRV8301-HC-EVM development kit. Including two USB ports, FTDI-chip and it works great out of the box with the laborations supplied by TI and CCS-studio. The size is however more humble. Our pcb, being a 6 layer design and two stacked pcb:s measures just 80x40x30mm, and weight is 122g including an Aluminium cooling block. The powerstage is dimensioned for up to 40V and 50A. Efficient cooling could further increase current capabilities. This now makes this design a viable choice for the RC community. For a model sail aircraft, one could skip the aliminium block, keeping the current below 15A and the weight is 75g.
However, we still have a few questions and issues, most likely related to our design which is based on the schematics of your dev.-kit completely. The only major change is Using IRF7004 mosfets in our design and the pcb layout of course.
1. We are using a small hobby RC motor with low inductance. In difference from your advices, we acheive best results using 10-15kHz pwm and the identification fails totally if we get over 25kHz, where it gets stuck in the beginning of the test with hum. This makes us suspect interferance in some way. We can also notice that the Rs value is drifting quite alot during different conditions. It can go from 0.008 Ohms to 0.038 Ohms. Is this to be expected as normal? When running the motor with Lab7 the Rs drift can lead to instability and the driver speeds up erraticly, at least thats how it seems. This happens when Rs suddenly starts to increase. Any idea what could be the reason for the drift in Rs? It is not happening all the time though. Sometimes it keeps very stable on Rs 0.018 Ohms no matter what we throw at it, stalling the rotor and so on.
2. I guess we could increase stability, if we have interferance, by incresing the current a bit through the voltage divider feeding the op-amps? As it is now it is using 95.3k and 4.99k. We could also increase the current sensing resistor values from 0.002 Ohms I guess, but this is done by decreasing efficiency, which we really don't want to do.
We really love this piece of software and FOC. We see huge benefits in our applications with this kind of drive. We just need to walk that last mile.
Best regards,
Mikael