Part Number: DRV8662
Hi everyone,
I tried so simulate the DRV8662 using Tina-TI (DRV8662 was already provided via the find component feature). However, I always get output voltages around 3V instead of the expected 100V.
I'm pretty sure that my wiring is correct since it is similar to the design guide document. Any ideas and suggestions?
Regards
Felix
Part Number: DRV8873-Q1
Hello,
I've been looking for the DRV8873-Q1 SPICE model for my simulation in LTSPICE but I haven't been able to find one on TI's website. Would you kindly point me to it's location?
Thanks,
John
Part Number: DRV8850
Dear TI experts~
There are 2 problems about DRV8850
1. When we tested in the lab, the chip performed normally; after the prototype was handed over to the customer, there was no output of the chip, and it returned to normal after replacing the chip.
2. During the previous test, the entire circuit was short-circuited; the current was too large after power-on, and the LDO did not work.
If you can leave a email，I can send you the Schematic~
Thanks,
Robin
Part Number: DRV8302
Hallo,
we working on a Design with the DRV8302 chip on it. In the file you can see an abstract of our schematic.
The motor is a BLDC with 250W and a battery voltage of about 36V. It work well in the normal operating condtion of the BLDC-motor - current under 10Amps.
But we have a problem in the overload condition of the motor as well as the startup of the motor. In this condition we get the Fault Pin of the DRV8302 chip - the current in this cases is round about 20A.
The over current detection is switch off. We have already checked the PVDD, DVDD und GVDD Pins in case of undervoltage with no results. Then we increase the decoupling capacitors of this voltages, also with no results. Also the decoupling of the PVDD pin from the load with an inductor brings no result.
Is there any other Fault source in the DRV8302 chip? Do you have any other idea to fix the Problem?
Part Number: DRV8874
Hi all,
Could you tell me the schedule of production release to market?
Thanks in advance.
Best regards,
Toshi
Part Number: DRV8842
Hello,
I would like you to confirm whether following input is allowable or not.
* Input "HIGH" level(100% duty) to both IN1 and IN2 for DRV8842.
According to datasheet of DRV8842, min "Externally applied PWM frequency" is defined as "0 kHz". It seems that user can input 100% duty signal to IN1 and IN2.
On the other hand, I found DRV8840. Input interface of this device is defined "PH/EN". (I'm not sure what is different between DRV8842. Because DRV8842 also allow 100 duty cycle.)
I confirmed logic table of H-Bridge.
According to above, DRV8842 have both output High state. (In this case, If user use 100 duty cycle as PWM, I think there is no chance to reduce current.)
So, the question is below.
* Does DRV8842 actually allow 100% duty for high level to IN1 and IN2 pins ?
Thanks in advance,
Part Number: DRV8301
Hi,
I am looking into some gate drive control register, about the gate current setting, how will if affect our design if we choose different driver current?
Thanks
Part Number: DRV8353
Hi,
We are working on the DRV8353RS Custom board. We are able to run the motor by 1x PWM Mode.
The motor smoothly run on clockwise but it not smoothly runs on anti-clockwise
So now we move to 3x PWM Mode for that We install motorware SDK by following this document http://www.ti.com/lit/ug/slvubh8b/slvubh8b.pdf
But I can't find any DRV8353 related examples as mentioned on document.
SDK Used: motorware_1_01_00_18
Questions:
1. Why motor not running smoothly in one direction?
2. Where can I find DRIVER and 3x PWM Mode Example for DRV8353RS?
Regards,
Ravi
Part Number: DRV8323
DRV8323, shunt amplifier, RC filter design
I’m trying to figure out how can I calculate the output RC circuit of Shunt amplifier / ADC frontend.
My settings are
- Gain=40
- Bidirectinoal 3phase current meaurements via 1mOhm shunt resisistance . Current +-37,5A -> +-20A work area
- Vref = 3V
- ADC input capacitance – 4pF – STM32H750.
- Tasq – 41ns
- ADC resolution 16bit . target ENOB 10..12bits
Available info from DRV8323 datasheet
Output current – 0..5mA – recommended condition
Gain 5,10,20,40
Slew Rate = 10V/usec @60pF load
Unity gain BW =1MHz
My question is how can I calculate the output RC filter from provided data?
https://e2e.ti.com/support/motor-drivers/f/38/t/838906
Even more it becomes more confusing. It seems the R6 is datasheet does not exist. I knew that similar drawing is shown in DR8301 datasheet and R6=100Ohm
Up until now I found the following solution. Use TI TIDA values of 100ohm, 3n3 as reference. Via trial and error find the best value. I’m sure that this is not the right way.
Can you please provide me with solution , document reference etc.?
Thanks in advance
Mirtcho Maglijanov
Part Number: DRV8832
The FAULTn signal is asserted after leaving the SLEEP mode,
but can we assume from the data sheet that FAULTn is not asserted when entering FORWARD/REVERSE modes from BRAKE mode and vice-versa?
Before committing to a PCB please can this be verified by TI?
many thanks
Tim
Part Number: DRV8353R
Dear Team,
We are testing our motor controller based on DRV8353RH in 1x mode. Motor has 27 Poles and hall sensor placed 120 degrees apart.
We could observe noise and oscillations while the motor is running. Also, the noise is more in while rotating in one of the directions when compared to the other direction.
We have tried with 25kHz and 40 kHz PWM with 20%. Board consumes around 1 Amp @ 48V, Motor RPM is around 210.
When we increase the dulty cycle to 40%, the current consumption is increased to 2.4 Amp and the noise is high
Please support us on to resolve this for the smooth motor operation.
With Best Regards,
B.Saravana Vikram.
Part Number: DRV10866
Hi Team,
My customer has the DRV10866 running in an early prototype but they are finding that they need to reduce the jitter.
While currently spinning at 1800 RPM (30Hz) and the once around jitter is about 18us peak-to-peak based on an optical measurement. This is strongly driven from the random jitter on the bemf signal Fg of about 40us peak-to-peak. Can you tell me how the Fg signal is generated? Is the analog bemf signal synchronized to an internal clock frequency or is Fg the digital representation of the purely analog bemf?
Have any users of this device employed RC filters on the winding voltage and neutral point to reduce jitter? If we can’t dramatically reduce the jitter then we will need to find an alternate device.
Any feedback you can provide would be helpful.
Thanks,
Mitchell
Part Number: DRV8701
Hi all,
My customer is seeking a motor driver solution from TI. I only found the DRV870x solution from ti.com ,but the PWM frequency is fixed. (100kHz)
He would like to operate in 20 kHz to reduce switching loss and heat. Below information is the application background. Could anyone recommend the corresponding solution including motor drivers and external MOSFET ? Thank you for your help.
Background:
Application : Automotive (PTG motor driver)
Topology : H-Bridge
Maximum load current : 15A/30A
switching frequency : 20 kHz
input voltage : 9-16V
test condition : Vin=18V / an hour / 85 Celsius degree
Vin=26V/2 min / 85 Celsius degree
ISO7637 pulse5b 40V/400ms/0.5Ω
Part Number: DRV8702-Q1
To cut costs in our controller design, I am thinking of re-using the digital voltage regulator in the DRV8702.
Our initial design will include an assembly option to include either the internal regulator for our external logic, or to use the regulator in the DRV8702.
The maximum power usage at the logic voltage will be approx 39mA (however this is worst case, with a MCU which will use less than estimated). The DRV8702-Q1 can output 30mA (under the assumption that the max dissipated power of the package also allows this), and we have 2 DRV8702-Q1`s in our design.
Can I safely connect the LDO ouputs together to get a higher max output current (does the internal design allow this?)?
Externally balancing the current using resistors will give too much voltage drop to allow for the wide range of DVDD (2.9 .. 3.5V).
Part Number: DRV8701
Hi team,
my customer would like to know what is the lowest frequency our device could drive an external coil if not a solenoid. Ideally they would like to go as low as 80Hz to 1kHz with Iout 0-5A, do you believe this is doable with this device?
Also, do we have anything similar to this device but with integrated FETs? High current would be nice, in the order of 50A.
Thank you in advance,
Best regards,
Adrian
Part Number: DRV8844
The datasheet specifies max continuous current of 1.75A and peak current of 2.5A, but only at 24V. I can't seem to find any information on how those max values should be derated if I'm operating at, a higher voltage (48V - 56V in my case). Is there a way to calculate it?
Part Number: DRV2605L
Hi,
Greetings.
Our customer is using DRV2605L in their design. However they want to know if they can use a 2.2-uF capacitor on the REG pin instead of the recommended 1-uF capacitor. Could there be any stability or other problems if this were increased to 2.2uF? This is for the sake of reducing Bill of Materials variants.
Looking forward to your response.
Regards,
Cedrick
Part Number: DRV8343-Q1
Hi Team,
Could you tell me how to set PWM frequency in 1XPWM mode?
Is output PWM frequency same as input PWM frequency to INHA?
Regards,
Takashi Onawa
Part Number: DRV8701
Hello..
i need information regarding what input i need to provide for the DRV8701 and how to drive the motor .
could you please send any waveforms regarding this motor driver.
How i am sending pwm wave form is IN1 i make as 1 and IN2 as 0 and sleep as 1 for forward direction for reverse direction i make IN1 as 0 and IN2 as 1 and sleep as 1
Part Number: DRV8711
We developed motor driver with the DRV8711 driver and CSD88537ND mosfet almost similar to the design in the following blog:
e2e.ti.com/.../spin-it-designing-your-own-motor-drive-and-control-system-part-4
We have added gate resistors because we use a 2.8A motor. During EMI testing we discovered the following:
120R Gate resistors at low side only will not pass the EMI test.
120R Gate resistors at low and high side will not pass the EMI test
240R Gate resistors at low and high side will just pass the EMI test
We used the following settings: IdriveP = 50mA, IdriveN = 100mA and Tdrive = 250ns (larger drive currents gave worse results)
My questions:
1)
In the datasheet there is mentioned only place 47R to 120R gate resistors at the low side. With these resistor values we will not pass the EMI test.
Can we use the 240R resistors (or even higher) so we can pass the EMI test?
2)
Are there settings (besides Idrive and Tdrive) which we can check to improve EMI?
3)
Are there any other options to improve EMI (based on the design from the blog)?