Hello,
I am using DRV8811 to control a motor. I am applying 3.3V to STEP pin for 50us and 0V for 9ms. After some revolutions of motor the DRV getting too hot, it stops the motor like glitches. I have copied the schematic from DRV8811's datasheet. I am revolving motor in full step mode. With such slow rotating speed there is a more heating problem.
Some details are mentioned below-:
Motor type-:bipolar
step angle-:1.8 degree.
current rating-: 1.5A
Vm is 11.57v
Vref=1.65V
VDecay=1.65V,
SRn=0V
Hello support team,
I have built a 3-phase buck converter based upon DRV8332 driver. Each channel drives the output capacitor through a 47 uH inductor. It works fine.
Now that I have it working, I need to test its overcurrent and overtemperature protection features.
Do you have a standard procedure for these tests? I mean, a procedure that brings the driver to a fault condition without damaging it.
Thanks in advance,
Michael
Hi,
I have been working on this IC. My query regarding this device is that how does maximum value of chopping current is set? according to functional block diagram in datasheet the Rsense connected between ISENA/ISENB and Ground must be playing role in setting value of 100% value of chopping current resulting into proportional change current values in each step in Microstepping. but What I observed is totally different because even if I change value of resistor connected to between ISENx & Ground, value of current is not affected. please solve my query.
Dear Support team,
DRV8701 can separate VBAT of driver power from VM of motor power according to p.27 in datasheet.
Is it possible to separate VM of DRV8704 from the external motor power like DRV8701?
We wants to supply 12V as driver power and 6~8V as motor power.
Is it acceptable for DRV8704?
Best regards,
Hiro Takahashi
Works well, but motor rotates in only the counterclockwise direction regardless of the direction pin voltage level. has anyone encountered this, am I missing something, or do I have a defective part?
Hi All
I did buy DRV8701EVM board. I would like save installed firmware before I will start developing my SW. How to do it? Thank you.
I am working on DRV8302.I have a problem that my GVDD pin sometimes have proper working voltage (10.8V) and sometimes it get to 0V.I don't know why it is happening.I connected a 2.2uF electrolyte capacitor to GVDD pin because i did't got ceramic capacitor from the stores.But i don't think that capacitor is a problem because sometimes it work.please help me
Hi! I readed that topic: e2e.ti.com/.../439141
and datasheet for DRV10975 and can't clearly understand what RPM range can I expect
from that IC? I wondering can I use this IC for use in my diy quadcopter control system?
There is will be lightweight quadcopter (200-400 gr) so I don't need powerful brushless
motors? Can I use that IC instead of commonly used ESC's? If not exactly that IC, maybe
others?
sorry to trouble you to check my design.
Hello,
Our customer is using the MC33887 and is thinking of using the DRV8873 and DRV884 for two different applications. What advantages do our devices have over the MC33887?
Thanks,
Josh
When using DRV8812 to drive a stepper, in some cases, step loss can be identified during power OFF -> ON.
In this application, stepper VM will be cut when it is not used and power up when it is required to operate.
Is there any specific requirement on the power up sequence between VM and logic control inputs?
Thank you.
Dear Sir.
I am using the EVM DRV8823EVM.
I do manage to drive a dc motor with the Software supplied by TI .
How is it possible to drive a Step Motor with this EVM and the TI's demo software.
How the DRV8823"knows" which motor is connected ?.
Please Advise.
Ephraim Oved.
A customer is having an issue:
We have been struggling to find an answer to a tolerance issue related to the DRV8301 driver chip that we use in a lot of our products now. Occasionally, we are finding that the voltages we measure on SO1 and SO2 current amplifier output pins are not within the tolerance range specified on the DRV8301 datasheet with zero current flow to the current amplifier inputs. The datasheet says that these outputs should have an output bias voltage of:
Output Bias with zero input current = (0.5 * Vref) ±0.5%.
However, occasionally we will have a DRV8301 not meet the specified tolerance. For example, one of our controllers had these readings:
REF Pin 24: 4.952V
SO1 Pin 25: 2.573V
SO2 Pin 26: 2.568V
SO1 and SO2 should be in the range of 2.464 – 2.488 to be within +/-0.5% of REF voltage. However, they are out of range by as much as 3.2%.
We need to know from TI if the +/-0.5% tolerance is correct, and if so, why would some DRV8301 chips not meet this specification. Moreover, if these current amplifier outputs are not within spec, is there concern that the DRV8301 may not function reliably in the future? We can account for the tolerance through calibration of our controller, but we do not want to ship these controllers to customers if the DRV8301’s are prone to premature failure.
Thank You.
Hi Team,
Can you help review the DRV8818 schematic for the FA case and provide your comment for the fail case?
Customer did the FA analysis and found the fail is on the DRV8818.
Thank you and Best regards,
SHH
Hi Team,
For DRV8837, we can see the motor power supply voltage is from 0 to 11V and the chip power supply voltage is form 1.8V to 7V from the data sheet.
For DRV8432, I need to confirm whether the motor power supply voltage is PVDD and the chip power supply voltage is VDD? If so, what GVDD is?
For DRV8800, the motor power supply voltage is VBB, but which pin is the chip power supply voltage?
Thanks,
Best Regards,
Good evening.
This is regarding TI-Motor Driver 'DRV8834PWP' ,humming sound of motor and Operating & holding current through it.
We have updated circuit to resolve issue of jerk as per our previous mail communication.
Please refer attached block diagram for updated motor driver connections with motor and Motor datasheet.
We are operating motors with following general steps :
Here we are keeping all motors enabled till operations on all motors get done.
Observations:
If we start operating any single motor,there is no hummimg sound coming from that motor,but remaining 5 enabled motors still produce humming sound.
Motor Current Calculations | ||||
Itrip =180mA/winding (set current) | Theoretical Calculations | Practical calculations | ||
Description | Max. Current /winding (with Itrip =180mA/winding) | Max. Current /winding (with Itrip =180mA/winding) as per Motor Driver IC datasheet Table 5. Current and Step Directions | Winding A |
|
Motor Rated current /Phase | 0.180A | 0.128A (71% at winding A) | 0.152A (Winding A) | 0.52A (Winding B) |
Motor Rated current /2-Phases | 0.360A | 0.256A | 0.204A | |
Total Motor current /simulator (6motors) | Total current =0.516@9VDC | |||
Queries:
Which current should we take for motor power supply design?or Is any parameter missing in theoretical calculations?
Dear Motor Drive Team.
I have a question related to overcurrent protection feature in DRV8871: can it be assimilated to the one implemented on DRV8842 (on each fet) or is it monitored on the entire HB?
here below from DRV8842 DS
An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this
analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled and the
nFAULT pin will be driven low. The device will remain disabled until either nRESET pin is applied, or VM is
removed and re-applied.
Overcurrent conditions on both high and low side devices; i.e., a short to ground, supply, or across the motor
winding will all result in an overcurrent shutdown. Overcurrent protection does not use the current sense circuitry
used for PWM current control, and is independent of the ISENSE resistor value or VREF voltage.
Furthermore is there any difference between the two DRV in terms of overcurrent protection in case of phase short condition?
Thanks for your inputs
Kind Regards
Nicola
What is the difference betwen DRV8833CPWP and DRV8833CPWPR?
Is the difference only in cost?
From the DRV595 system block diagram it is clear that the return of the switch transistors are separated from to the other GND pins.
There are however three GND pins on the ringht side of the chip.
Are all three floating from the rest of the chip?
How are the three pins on the right side related to each other?
Is there an internal connection on the chip afterall?
From the blockdiagram it does not seem logical with an uneven number of separate GND pins.
My plan is to measure the current through the TEC by grounding the return through a resistor.
My interpretation of the block diagam is that if the thermal pad is going to be referenced to the GND plane of the board. Then from the block diagram I understand that It needs to be connected to the GND pins not associated with the switch transistors return current.
Is this correct understood?
Regards Anders
