Part Number:DRV8320
Hi
When Changing PWM frequency 10KHz to 20KHz with setting motor speed as 100% motor speed will change as to be increased.
Regarding to GUI parameter :
Set Motor Speed : 100%
PWM switching frequency : 10KHz -> 20KHz
Current Motor Speed : 1605 rpm -> 3225 rpm
Is it normal operation?
BestRegards
Part Number:DRV8872-Q1
What would the minimum PWM rise and fall time of the device be operating at 20kHz?
Part Number:DRV10987
Hi,
If I want to overwrite the EEPROM register, do I have to follow any procedure.
-Archana
Part Number:DRV8703-Q1
My customer is asking the following questions concerning the DRV8703-Q1:
We will be using SPI to program the gains and thresholds. But initially we thought to make sure we drive the motor through hardwired signals.
So, the SPI pins are left open. The chip select is not used, and this is only used if we want to do the SPI comm.
The Vref pin we currently have it connected to 3.3V. Yes, we are operating in default mode.
With nSLEEP low, the voltage seen on SH1 and SH2 are 0V (mv range) as expected. But when nSLEEP is HIGH, the SH1 and SH2 are 0.747V. Same voltages observed at GH1 and GH2. But GL1 and GL2 are in mV range. When in Hi-Z, the voltages should be all 0V.
The data sheet does not provide details on how SH1/SH2 are used within the chip. Is the driver IC sourcing any voltage on these 2 pins, which in turn might feed back to GH1/GH2 ? The above voltages are seen when SH1/SH2 are not connected to our controller.
Now, if we connect our controller, then the voltages are little different because we have a ladder network for detecting off state faults on the load. This ladder network is pulled up with 12v, and if SH1/SH2 are Hi-Z, then I expect a voltage based on ladder network. But as the driver chip is sourcing some voltage we see much lower voltages.
What does TI's recommendation for off state diagnostics? I understand that the driver IC can detect the over current/temperature, but this could happen only if we drive the motor. We need to detect the faults before to inhibit driving the motor if there is fault detected (STG, STB or Open circuit). The ladder network helps doing this.
Can the customer use the ladder network that he is referring to? Is it normal to see voltages on SH1/SH2? This seems like a diode drop, but I cannot tell. This is the main reason for the questions.
Thanks for your help with this!
Richard Elmquist
Part Number:BOOSTXL-DRV8301
Respected Sir/Madam,
Is it safe to drive a BLDC motor with following specifications using the DRV8301 Booster pack (BOOSTXL-DRV8301) and C2000 F28069M piccolo launchpad (LAUNCHXL-F28069M)
PEAK CURRENT : 18A
RATED CURRENT : 10A
VOLTAGE : 24V
Thank you
Regards,
Vignesh.J
Part Number:DRV8432
Hello,
I am using a DRV8432 to drive a 24V DC motor.
For safety reasons, the 24V is externally switched so that I can guarantee there is no power delivered when it is not required.
I use the same switch control for the G_VDD rail (12V).
We ran some endurance tests and the 12V rail eventually when shorted to ground. When disconnecting the G_VDD pins from the 12V rail, the 12V came back to normal so the conclusion is that the DRV8432 is burnt.
Is this a bad idea to switch the G_VDD off ?
Would it be better not to switch the G_VDD (keep it to 12V all the time even when the P_VDD if off) ?
Thanks,
Nicolas
Part Number:DRV8871-Q1
Hi team,
Greetings. I have a question about the VM bulk cap of DRV8871-Q1.
The parameter is that VM=12V coming from automotive battery, normal working current=1A, stall current=2.5A.
Duty cycle is 100% only using high or low voltage level to controll.
Can I just use a 1uF ceramic cap here? Is there any drawback?
What if I use 10uF ceramic cap or a bulk cap? Any problems?
Customer said they used 0.1uF cap on VM pin when they used two half bridge chips before, there was no problem.
Look forward to your reply.
Thank you.
Best Regards
Jack Chen
Part Number:DRV8323
Hallo,
It concerns the CAL input of the DRV8323.
I designed the layout so that I can apply the DRV8323RH or the DRV8323RS
It is ferry difficult to add to the CAL signal in the design, also I do not yet understand how the CAL signal works.
The question is : can you advice my about CAL signal for the DR8323RH and the DRV8323RS.
Thanks in advance.
L.v. Rijn
Part Number:DRV8323
Motor gurus:
On the DRV8323S - does the DRV8323S use any of the current sense input/outputs for internal use? In other words - if one does not connect them up (and uses an external sensing scheme) - would it cause issues in the DRV8323 operation?
There does not appear to be any internal (i.e. to the control/fault scheme) connection... but I wanted to check to make sure.
The alternative would be to simply change to the DRV8320RS version.
Thanks!
Part Number:DRV8870
Hi team,
The customer uses DRV8870. The customer's schematic is in the attach.
ISEN pin is shorted to GND. But VREF is connected to 5V power supply.
Would you check if the customer's schematic is correct? If ISEN pin is shorted to GND, is VREF pin keeping floating
or connected to a power supply?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
Part Number:DRV8308
Hi,
1.
My server FAN max speed is 620Hz ,2A, VM=12V at 120° Commutation PWM mode,
When I use Clock Frequency Mode to implement speed closed.
Fclkin=100Hz start up is ok, then increase to 600Hz ok.
But setup Fclkin>=300Hz start up always fail.
When speed increases/decreases not smooth and Speed oscillation is obvious.
Any suggestion?
My setting as below:
2.
The 2nd question is that the VM (12V) has a very high regenerated-voltage as below picture when FAN's speed decreased (ex: 300Hz to 200Hz).
Why? how to avoid it happen?
best regards,
Simen
Hello,
I have read spru485a (page 201) SVGEN_DQ part and I couldnt understand the idea below information. Because, according the below information when my phase A voltage is sin(wt), my reference voltage is cos(wt). Is there any specific reason why this transformation projects the quadrature or β component, Ubeta, into Vref1.
In other words if I apply the conventional inverse clarke transformation, is it problem for my motor control?
Part Number:DRV8842
Hello All,
I am working on a new product using the DRV8842 driver. My application is driver a brushed DC motor at 24V. I have my current chop threshold set at 4.7A. The application is very low duty cycle.
As in most applications, the startup exceeds the design current, and hence the DRV8842 is going into current chopping, which is fine. However, the current chopping is causing 12A spikes, which I believe is the cause of my frequent driver faults. I have verified the ringing is real by using three different methods of capturing the current waveform. I believe the 3uS fault blanking time is too short to avoid faulting on the spikes.
I would appreciate any suggestions.
Thanks,
Kevin
Part Number:DRV8843
Hello
We wish to driver the AIN0/1 of the DRV8843 with a 200KHz 50% duty cycle signal.
The AIN0/1 are complantery (180 degress out of phase with respect to each other).
The same the BIN0/1.
Output current is no more than 300mA for each channel.
The datasheet specify no more than 100KHz pwm freqency.
Can we work with 200KHz under there conditions of low current and 50% duty cycle.
regards
Oded
Part Number:DRV8303
No load connected with proper threshold settings and yet over current faults chatter at the digital output. Increased the threshold but had minimal effect. Dead time is large and increasing it is not helping much either. What could be wrong? When the function is only disabled, it works fine. There are 10Ohm gate resistors.
Thanks.
Part Number:DRV8832-Q1
Hi Team,
My customer asked following questions about DRV8832-Q1 Datasheet.
(1)OCP time
In 7.3.6.1, datasheet says “If this analog current limit persist for longer than the OCP time, …” but it seems no description for OCP time. Could you provide OCP time?
(2) 8.2.2.2 Motor Current Trip Point
In this section, there is a description as below.
"To set IILIMIT to 0.5 A, RISENSE = 0.2 V / 0.9 A = 0.22 Ω."
For the part of "To set ILIMIT to 0.5A", is it typo and should be corrected to "To set ILIMIT to 0.9A"?
Best regards,
Nobuo Fujihara
Part Number:DRV595
Hello,
I am using drv595 to drive a peltier 12V/7A. I have used the standard schematic given by ti. Fault and SDZ pin is shorted and pulled up.
Freq =500KHz (FS0= high, FS1= LOW, FS2=LOW)
MODSEL PIN = LOW, Master Mode selected, Gain selected is 26dB. Input voltage given to IN+ pin is 2.2v.
Supply voltage PVCC is varied from 5 to 12V but there is no output on the outp and outn.
For fault detection voltage on fault is high that means is is working in normal mode.
Why the DRV595 is not giving output in the following condition? Please suggest some solution.
Part Number:DRV8703-Q1
Dear Sir.
My customer is evalating DRV8703-Q1 as brushed motor pre-driver for their system.
At this time, OEM pointing out the GND level difference between DRV8703-Q1 GND
and Motor GND. It may be around 1 ~ 1.5V.
DRV8703-Q1 GND is a kind of ECU GND. Motor GND is a kind of vehicle Chassis GND.
Both case will be happened, ECU GND > Chassis GNG, ECU GND < Chassis GND.
(I guess it affect negative surge protection diode, etc).
They will not put low side Rsense for current measuring.
Now, They are asking about the influence of such GND level difference on DRV8703-Q1.
Sorry to disturb your job suddenly. Please give your advice.
1. I suppose no influence on DRV8703-Q1 basic function because these are based on
ECU GND. I wonder my guess is correct?
2. I suppose no influence on DRV8703-Q1 protection function because VDS monitor is
executed by voltage difference, not absolute voltage level from GND.
I wonder my guess is correct?
3. I suppose there was an influence on Gate charge because VDS would be shifted.
I wonder my guess is correct?
4. This is related to above #3.
I wonder VGS(th) would get the influence? Is there a possibility FET turn-on or
turn-off was obstruced due to such influence?
Best Regards,
H. Sakai
Part Number:DRV8703-Q1
Dear Sir.
My customer is evalating DRV8703-Q1 as brushed motor pre-driver for their system.
At this time, OEM pointing out the GND level difference between DRV8703-Q1 GND
and Motor GND. It may be around 1 ~ 1.5V.
DRV8703-Q1 GND is a kind of ECU GND. Motor GND is a kind of vehicle Chassis GND.
Both case will be happened, ECU GND > Chassis GNG, ECU GND < Chassis GND.
(I guess it affect negative surge protection diode, etc).
They will not put low side Rsense for current measuring.
Now, They are asking about the influence of such GND level difference on DRV8703-Q1.
Sorry to disturb your job suddenly. Please give your advice.
1. I suppose no influence on DRV8703-Q1 basic function because these are based on
ECU GND. I wonder my guess is correct?
2. I suppose no influence on DRV8703-Q1 protection function because VDS monitor is
executed by voltage difference, not absolute voltage level from GND.
I wonder my guess is correct?
3. I suppose there was an influence on Gate charge because VDS would be shifted.
I wonder my guess is correct?
4. This is related to above #3.
I wonder VGS(th) would get the influence? Is there a possibility FET turn-on or
turn-off was obstruced due to such influence?
Best Regards,
H. Sakai
Part Number:DRV8703-Q1
Dear Sir.
My customer is evalating DRV8703-Q1 as brushed motor pre-driver for their system.
At this time, OEM pointing out the GND level difference between DRV8703-Q1 GND
and Motor GND. It may be around 1 ~ 1.5V.
DRV8703-Q1 GND is a kind of ECU GND. Motor GND is a kind of vehicle Chassis GND.
Both case will be happened, ECU GND > Chassis GNG, ECU GND < Chassis GND.
(I guess it affect negative surge protection diode, etc).
They will not put low side Rsense for current measuring.
Now, They are asking about the influence of such GND level difference on DRV8703-Q1.
Sorry to disturb your job suddenly. Please give your advice.
1. I suppose no influence on DRV8703-Q1 basic function because these are based on
ECU GND. I wonder my guess is correct?
2. I suppose no influence on DRV8703-Q1 protection function because VDS monitor is
executed by voltage difference, not absolute voltage level from GND.
I wonder my guess is correct?
3. I suppose there was an influence on Gate charge because VDS would be shifted.
I wonder my guess is correct?
4. This is related to above #3.
I wonder VGS(th) would get the influence? Is there a possibility FET turn-on or
turn-off was obstruced due to such influence?
Best Regards,
H. Sakai