Hi Rick,
Do your experts have any recommendations for me ?
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RE: finding a motor driver to 0308 FAULHABER's motor
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finding a motor driver to 0308 FAULHABER's motor
hello,
I am trying to find a motor driver to the FAULHABER 0308 sensor-less BLDC motor that i am using.
[View:/cfs-file/__key/communityserver-discussions-components-files/38/0308_5F00_B_5F00_DFF.pdf:1230:0]
i want to be able to spin the motor in 40000 rpm with a motor voltage of 5.5V
i have already purchased your DRV10963 motor driver , but it didn't spin the motor well.
i tried all the parameters there but it didn't reached even close to my desired RPM. i think that the problem was that the driver was not able to pass from open loop to closed loop because the BEMF in low RPM was hard to read.
do you have any recommendations for another motor driver that will be to handle that motor ?
thanks - SAM
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RE: DRV8701: DRV8791 Evaluation GUI Software won't run
Hello Kevin,
GUI Composer Runtime is a standalone yes. I gave you the CCS link by mistake, I apologize. It might have been the version of the download (v6.2.0). I am glad is it now working correctly for you. Thanks
GUI Composer Runtime is a standalone yes. I gave you the CCS link by mistake, I apologize. It might have been the version of the download (v6.2.0). I am glad is it now working correctly for you. Thanks
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RE: DRV8801: VPROPI Output current
Hi Sheldon,
The output of VPROPI is not a standard X5 op amp. It is expected to drive a high impedance input and no more than approximately 110uA.
Think of the VPROPI output as a current mirror driving an internal load. At the SENSE pin, the voltage is converted into current using a typical 4.6k resistor. This current then drives an internal load resistor of typically 23k (5X) to create the VPROPI voltage. Adding external resistance to ground creates a parallel resistance path and affects the gain of VPROPI.
To avoid or minimize the effects on the output, there are several options:
1) Add an external amplifer to reduce the voltage into your ADC.
2) Use the voltage on the SENSE pin as the input to your ADC. The full scale voltage at the ADC would be reduced.
3) Change the resistor divider values. Using 3M/2M (or 300k/200k depending on accuracy desired) should reduce the effect of the external load. This could create issues with system noise.
4) Recognize this parallel resistance in the calculation and adjust according. For you, an external load of 15.33k to ground on VPROPI should work.
The gain can be modified by the equation G = (23k||Rext)/4.6k.
The output of VPROPI is not a standard X5 op amp. It is expected to drive a high impedance input and no more than approximately 110uA.
Think of the VPROPI output as a current mirror driving an internal load. At the SENSE pin, the voltage is converted into current using a typical 4.6k resistor. This current then drives an internal load resistor of typically 23k (5X) to create the VPROPI voltage. Adding external resistance to ground creates a parallel resistance path and affects the gain of VPROPI.
To avoid or minimize the effects on the output, there are several options:
1) Add an external amplifer to reduce the voltage into your ADC.
2) Use the voltage on the SENSE pin as the input to your ADC. The full scale voltage at the ADC would be reduced.
3) Change the resistor divider values. Using 3M/2M (or 300k/200k depending on accuracy desired) should reduce the effect of the external load. This could create issues with system noise.
4) Recognize this parallel resistance in the calculation and adjust according. For you, an external load of 15.33k to ground on VPROPI should work.
The gain can be modified by the equation G = (23k||Rext)/4.6k.
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RE: BOOST-DRV8711: SPI MISO Not Functioning
The SPI pin locations comply with the BOOST-DRV8711 interface. I have reason to believe that the registers are never being written through the SPI interface:
I attempted to write the enable bit (register 0, bit 0), and I sent pulses on the STEP line. The outputs to the motors remained inactive.
What is the polarity of SCS? I have it coded as active high, according to the datasheet, but it is worth a sanity check.
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BOOST-DRV8711: SPI MISO Not Functioning
Part Number: BOOST-DRV8711
I am working to configure the DRV8711 BoosterPack using the SPI register interface on the DRV8711 IC. The MCU I am using is the MSP-EXP432P401R LaunchPad. My code uses the most recent version of MSP432Ware's DriverLib. I use CCS v6.1.
I have been unable to read the registers because the SDO line on the BoosterPack is always logic high. I suspect that the SPI interface on the IC is broken (the SDO pin is perhaps stuck in a high-z state, defaulting to its pull-up value), or I am missing something in my code setup. Below are a couple of screen captures: the first is a write to the CTRL register, and the second is a read from that register. My timing meets the datasheet requirements, and I have tried both clock phase modes with the same results. The SDO line remains high at all times.
For reference, the signals are, from top to bottom, CS, CLK, SDI, and SDO.
Write:
![]()
Read:
I am at a loss on this. All of the appropriate pins are configured according to the IC's datasheet and the pinout on the BoosterPack. My code is attached. It starts with a single write to the CTRL register, followed by repeated reads in an endless loop. I have tried this with other registers; all have ended with the same results. What other debugging steps can I try?[View:/cfs-file/__key/communityserver-discussions-components-files/38/main.c:1230:0][View:/cfs-file/__key/communityserver-discussions-components-files/38/BoosterPackInterface.h:1230:0]
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RE: DRV8312: Integrated FET body diode ratings
Hi Aaron,
Our designers have been notified and we will reply as soon as possible.
Our designers have been notified and we will reply as soon as possible.
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DRV8312: Integrated FET body diode ratings
Part Number: DRV8312
What are the current and voltage ratings of the body diodes in the DRV8312 half bridge circuits? I have seen comments for other driver ICs (e.g. DRV8813) stating that the body diodes are rated to the same operating conditions as the rest of the device, but I didn't want to just assume this was the same for the DRV83x2 family.
Would these diodes provide sufficient protection if the PVDD power supply was reversed? That assumes that the VDD and GVDD were still correct. Ideally there would be additional protection circuitry outside the DRV8312. I'm just wondering how the device would perform in the absence of additional protection circuitry on PVDD.
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RE: DRV8702-Q1: SH1 sleep mode has voltage 0.8V
Hi Luis, thanks for your response. If the voltage of SH1 under Hi-Z is not 2.2V, what is the status of SH1 in Hi-Z mode? How about the voltage of SH1 under Hi-Z mode? Could you give me more detailed information about the circuit inside the SH1.
Thanks.
Sammi
Thanks.
Sammi
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RE: DRV8834: need help with DRV8834
hello sir,
i am running my pwm at 572z,with 50% dutycycle.after that i am varying my frequency like 600hz,300hz,400hz,and 800hz. i have checked this with oscilloscope.but still i am not able to vary the speed.i have made config pin to HIGH.i am running motor in indexer mode,
which other factors should i care?where may be the problem?
please help.
thanks
i am running my pwm at 572z,with 50% dutycycle.after that i am varying my frequency like 600hz,300hz,400hz,and 800hz. i have checked this with oscilloscope.but still i am not able to vary the speed.i have made config pin to HIGH.i am running motor in indexer mode,
which other factors should i care?where may be the problem?
please help.
thanks
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RE: Solution for diesel engine, throttle and solenoid control
Hello Vladimir,
The DRV8844 and DRV8412 are not automotive rated hence would not be suitable. We have automotive rated devices that can better fit your customer's application. Please take a look at these options: Brushed DC Gate drivers and Brushed DC Drivers w/Integrated FETs. Please let us know if you have questions about a particular device. Thank you
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Solution for diesel engine, throttle and solenoid control
Hello,
my customer started develop diesel engine controller (12V power domain) about month ago.
Now they looking for solution for throttle and solenoid control.
They choose NXP MC33926 and MC33816 as main competitors in this application.
I want to offer solution on TI components. I found 2 variants from TI DRV8844 and DRV8412 looks good in this application. But I'm not sure that it's a best solution.
Can anybody approve that my solution are best from TI? Or may be anybody offer something better?
My customer told me that solutions for this application typical is not a catalogue products, because it's automotive segment.
So I'm asking there - Do TI have a special solution for diesel solution.
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RE: DRV8702-Q1: SH1 sleep mode has voltage 0.8V
Hello Sammi,
The voltage of SH1 in Hi-Z mode should be about 0.7V. Section 7 in datasheet shows circuit inside of SH1 there is a large resistor in parallel of a diode which drives to ground in Hi-Z mode. Therefore, 0.7V from diode is expected. Thank you.
The voltage of SH1 in Hi-Z mode should be about 0.7V. Section 7 in datasheet shows circuit inside of SH1 there is a large resistor in parallel of a diode which drives to ground in Hi-Z mode. Therefore, 0.7V from diode is expected. Thank you.
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DRV8702-Q1: SH1 sleep mode has voltage 0.8V
Part Number: DRV8702-Q1
Hi, I have a question about the voltage of SH1. If nSLEEP=0, the output of SH1 is not in high-Z, the voltage measured is 0.8V,but it should be 2.2V(high-Z). Thanks.
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RE: DRV8312: Integrated FET body diode ratings
Hello Aaron,
I have confirmed that the body diodes are rated to the same operating conditions as the rest of the device.
For you second question, so we are in the same page. What do you mean by PVDD reversed? Please read section 7.1 of datasheet, Absolute maximum ratings for PVDD. Thank you.
I have confirmed that the body diodes are rated to the same operating conditions as the rest of the device.
For you second question, so we are in the same page. What do you mean by PVDD reversed? Please read section 7.1 of datasheet, Absolute maximum ratings for PVDD. Thank you.
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RE: Selection of launchpad,driver and motor
Hello Kaustubh,
We have multiple options for this. You can start looking at www.ti.com/.../tools-software.page
Also, another option for a complete package is: www.ti.com/.../DRV8312-C2-KIT
I hope this helps. Thank you.
We have multiple options for this. You can start looking at www.ti.com/.../tools-software.page
Also, another option for a complete package is: www.ti.com/.../DRV8312-C2-KIT
I hope this helps. Thank you.
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Selection of launchpad,driver and motor
Dear all,
A student is asking for a complete set (Launchpad + driver + Motor + Software ) for linear motor.
Could anyone suggest me these things please?
Thank you.
Kaustubh
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DRV8871: How to get EMK value of BDC-Motor
Part Number: DRV8871
HI,
I like to integrate the device DRV8871 into our new product generation. Up to now we use a H-bridge with our CPU. To get a feed back of the rotation speed of the motor we set one N-FET on and all the other of. In this case we kann measure the EMK which is proportinal to the rotation speed. So we have some time making our PWM signal and speed up the motor and we have a little time with now PWM but wih grounding the BDC and after that measering the EMK. This value goes into a regulation loop for controlling the speed of our BDC.
If we use the DRV8871 I don't have an idea how to get the EMK value? Is there anyone to help me?
Best regards
FG
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RE: DRV8834: need help with DRV8834
Hi Rakesh,
What is the state of the other inputs when CONFIG is high?
What is the resistance value of the sense resistors?
What are the motor specifications?
If the indexer mode is used, the motor should spin twice as fast with 800Hz than at 400Hz at the STEP input.
What is the state of the other inputs when CONFIG is high?
What is the resistance value of the sense resistors?
What are the motor specifications?
If the indexer mode is used, the motor should spin twice as fast with 800Hz than at 400Hz at the STEP input.
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DRV8832: VSET voltage dead band
Part Number: DRV8832
Hello support team,
My customer is trying to use DRV8832 to drive the VCM by changing the VSET voltage from 0V to 800mV. But, it seems there is some dead band of the VSET voltage form 0V to 150mV. In this range, the VCM does not work since the output of DRV8832 is no change.
Is this normal operation for DRV8832? Could you please give me any advice to solve the issue?
Best regards,
Kaizawa
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