Hi Rick,
Could you explain how the back EMF can assist? I don't understand.
Thanks,
Tim
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RE: DRV8711: Optimizing DRV8711
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DRV8711: Optimizing DRV8711
Part Number: DRV8711
We are using the DRV8711-EVM to drive a motor that is fairly inductive (200 step/rev, 6.5mH, 2.1 ohms). For accuracy, we need to use microstepping of 64, and for speed, we need pps =100kHz. Our power supply is 28V, though we could use a 48V supply. We set the torque register to get 1A through the motor. As we try to increase the speed, our current waveform deviates from a sinusoid and becomes triangular. We are using the forced fast decay mode. Increasing the supply from 28 to 48V helps, but doesn't quite get us to where we need to be. TBLANK = 1.5us, TOFF = 5us, ISGAIN=40.
Any insights as to how we could improve things?
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RE: DRV8812: The output is absent
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RE: DRV8812: The output is absent
Sorry, the driver il DRV8412
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RE: DRV8812: The output is absent
Hi Serafino,
I see you have posted a new thread. We will close this thread and work on the new one.
I see you have posted a new thread. We will close this thread and work on the new one.
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RE: DRV8812: The output is absent
Ok
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DRV8812: The output is absent
Part Number: DRV8812
Hi to all, I'm using this driver to drive a DC motor.
I shorted to gorund M!, M2 and M3. I powered the IC with +12Vdc and I provided a complementary PWM at the input (PWM_A and PWM_B) but the OUT_A and OUT_B are also 0V.
I checked that the RESET pin are high and there are no fault.
What an I wrong?
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RE: DRV8412: The output is absent
Hi Serafino,
What is the voltage on the other pins?
VREG
VDD
GVDD_x
What is the OC_ADJ resistor?
Are the outputs loaded?
How are you measuring the outputs (with a scope or with a DMM)?
Assuming you are using a DMM, please try using a scope.
What is the voltage on the other pins?
VREG
VDD
GVDD_x
What is the OC_ADJ resistor?
Are the outputs loaded?
How are you measuring the outputs (with a scope or with a DMM)?
Assuming you are using a DMM, please try using a scope.
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DRV8412: The output is absent
Part Number: DRV8412
Hi to all, I'm using this driver to drive a DC motor.
I shorted to gorund M!, M2 and M3. I powered the IC with +12Vdc and I provided a complementary PWM at the input (PWM_A and PWM_B) but the OUT_A and OUT_B are also 0V.
I checked that the RESET pin are high and there are no fault.
What an I wrong?
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RE: DRV8332: need help estimating power usage
So the current through the body diodes....Is that just the current delivered to each motor winding?
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RE: DRV8332: need help estimating power usage
Hi Rob,
Yes it is. Please refer to Figures 6 and 7. If you are using cycle by cycle and high current, the power could be significant.
Yes it is. Please refer to Figures 6 and 7. If you are using cycle by cycle and high current, the power could be significant.
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RE: DRV8332: need help estimating power usage
From reading through that section of the datasheet and looking at the figures, it looks like figure 6/7 are only applicable to an over current event. I am not experiencing an over current event while running. For example, my 3 phase BLDC motor draws 2.5A under load. My current limit is set to 8A currently. Does this mean figure 6/7 are not applicable to my specific situation?
Why are the body diodes conducting during normal operation? I thought the diodes would be effectively shorted out when the FETs are on/enabled.
Why are the body diodes conducting during normal operation? I thought the diodes would be effectively shorted out when the FETs are on/enabled.
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RE: Stepper Motor Driver DRV8835 Voltage Problem
Hi Rick
I ordered another PCB to try. Could you let me know what is the series of codes we need to send to Ain1:Ain2:Bin1:Bin2 to run a 4-wire stepper motor?
John
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RE: DRV8332: need help estimating power usage
Hi Rob,
That is applicable to normal operation also if you are using M3=1, and M2=M1=0 (cycle by cycle current limit). In this case, if the current reaches the current limit set by the OC_ADJ resistor, the outputs will be disabled until the next PWM cycle.
A more detailed description of cycle by cycle operation can be found in section 8.3.2.1.1 of the datasheet.
That is applicable to normal operation also if you are using M3=1, and M2=M1=0 (cycle by cycle current limit). In this case, if the current reaches the current limit set by the OC_ADJ resistor, the outputs will be disabled until the next PWM cycle.
A more detailed description of cycle by cycle operation can be found in section 8.3.2.1.1 of the datasheet.
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RE: Stepper Motor Driver DRV8835 Voltage Problem
Hi John,
Before I answer your question, have you considered using PH/EN mode instead of IN/IN mode? This can save at least one GPIO, and perhaps two if you tie VCC to the two ENABLE pins.
Before I answer your question, have you considered using PH/EN mode instead of IN/IN mode? This can save at least one GPIO, and perhaps two if you tie VCC to the two ENABLE pins.
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RE: Stepper Motor Driver DRV8835 Voltage Problem
Hi Rick,
If Ph/EN is a better option, we will use that. Is it like Direction/Step? Does this have Sleep and Enable for power saving? (Phase and Enable is confusing for me).
If Ph/EN is a better option, we will use that. Is it like Direction/Step? Does this have Sleep and Enable for power saving? (Phase and Enable is confusing for me).
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Stepper Motor Driver DRV8835 Voltage Problem
I am using a stepper motor DRV8835. I have put in the function as the IN/IN mode (MODE =0), For AIN1, AIN2, BIN1 and BIN2 we gave signal as 0101 and the output voltage I was expecting as 0V, 5V, 0V, 5V. But the output voltage showed up as 5V, 0V, 2V, 2V. Does anyone know how to fix this problem?
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RE: DRV10963AEVM: Concurred with problems while using DRV10963 EVM GUI
Hi Alan,
Can you please check hardware connection, please refer EVM user guide for guidance, section 5.2, 5.3 and 5.4 http://www.ti.com/lit/ug/slau643/slau643.pdf
What flavor of DRV10963 are you using for this project?
Regards,
Krushal
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DRV10963AEVM: Concurred with problems while using DRV10963 EVM GUI
Part Number: DRV10963AEVM
Hi everyone, when I'm trying to get my motor driver work, some weird problems just occurred. In order to use the GUI, I followed the instructions from the user's guide of the EVM. However, when I clicked the button"set default register values" as it says, the GUI alerted me that errors came across, which specifically is:
Error -2 occurred at Error Converter (ErrCode or Status).vi
Possible reasons:
Receive Buffer is empty
Can anyone offer me some possible solutions? Thanks a lot!
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RE: DRV8332: need help estimating power usage
So would it be accurate to say the power dissipated in the body diodes (with a 2.5A load) are: Pd = (Vf*I) = 1V * 2.5A = 2.5W?
I could then add that to the power calculated using Rds_on to get a reasonable power number?
I could then add that to the power calculated using Rds_on to get a reasonable power number?
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