Tool/software:
Hello，
DRV8860PWP drives stepper motor. During the testing process, it was found that the waveform of the output pin was abnormal, as shown in the following figure. Please help analyze the cause.
The schematic diagram is shown in the following figure：
Thanks！
Tool/software:
Hi TI engineer,
The DRV8873S-Q1EVM is used to drive the motor, and the current is measured by an external ammeter.
When we prepared 2 configurations of controller →DRV8873S-Q1EVM and measured the current of the same motor, there was a difference in the current waveform, and when we investigated, one of DRV8873S-Q1EVM was MD006A and the other was MD006B.
From the above, I would like to ask the following two questions.
・MD006A and MD006B Changes
・Is there a possibility that the motor current waveform changes between MD006A and MD006B?
(Supplementary Explanation)
The PWM signal of the controller is connected to the pin near the center of the DRV8873S-Q1EVM and driven by PWM control.
The power supply is set to 7V/3A.
Tool/software:
Hello,
The results of our efficiency measurements are shown in the graph above. I have a question that has been puzzling me, I want to test the efficiency of the motor, according to the theory should be the output power divided by the input power, but when the power supply is 18.6V, the motor is subjected to a voltage of 13V at 3600 rpm, our power tester is the DC regulator source is connected to the power supply of the MCF8316A EVM, so the input voltage and current recorded is also the power supply this The input voltage and current recorded is also the voltage and current of the power supply. Based on the above description, I have the following questions.
1. I would like to know if the efficiency measured this way is accurate?
2. I would like to know the internal structure of the MCF8316A chip.
3. can I know the real time current of the motor? If so, please tell me how to do it.
I would appreciate if you could reply as soon as possible.
Tool/software:
Hi
Question on the device safety function. We have been running the application for some time and normaly runs fine. But we have some instances seen what seems to be one halv bridge side being turn on "both top and bottom".
We are running the device MODE = Hi-Z and havinng PWM on IN1 and IN2 depending on the direction. We are not using the chopper function. The issue have under light load.
If there is an SW "bug" that drive both IN1 and IN2 at the same time, should the driver not prohibit that senario ?
If this is normaly prohibit, what can make this issue occur.?
Tool/software:
Hi everone,
i have a question regarding the DRV8301 im trying to communicatie with the drive to put it in 3 pwm mode only i dont get any response.
my MCU is a STM32G431CBU at which the SPI port are connected.
if this is the wrong place for it im sorry in advanced
kind regarts,
Ruben Konings
Tool/software:
Hi,
I think these questions has been asked in some variation on this forum before, however I cannot find any full description of the solution/what goes on under the hood.
How does the DRV8353S trigger the auto calibration of the current sense amplifier
From the datasheet, I have the following; the auto calibration will occur when VREF passes some threshold.
How does this interact with the gate driver enable pin/device sleep state? The datasheet says that in sleep mode, the sense amplifiers are disabled. Does this mean that the sense amplifier will actually only auto calibrate when VREF and functional mode == operating?
Does this mean that, if the gate driver is powered (VREF is stable for a long period), the auto calibration will be triggered when the gate driver transitions from sleep to operating mode?
From the above description of the auto calibration, it is suggesting that the only triggering event for the auto calibration is VREF matching some threshold, and it is independent of the device functional mode.
How exactly are the SPI registers for calibration supposed to work. The datasheet is not at all clear on their operation and how they should be used.
The datasheet states that the CSA_CAL_X bits should be used to make each amplifier go into calibration mode. How exactly are these registers supposed to be used. It says that the AUTO_CAL bit should be set to 1, and then the CSA_CAL_X bits should be set to rerun the auto calibration routines. This description doesnt make sense with the description of the AUTO_CAL register. 0 is the manual calibration mode, and 1 is the auto calibration mode. For AUTO_CAL, what do these bits mean? Does manual mode mean we are manually triggering CSA_CAL_X after the initial boot-up auto calibration? Or if the previous statement is correct, why is bit == 1 called "auto", when we are manually having to trigger the calibration routine by setting CSA_CAL_X ? What does manual mode actually mean here, there is no other reference to it in the datasheet.
Furthermore, how is CSA_CAL_X supposed to be used? It appears that it needs to be turned on, and then off at some period of time. Without turning this off, the sense amplifier appears to not work and causes an over current event on the HW.
Essentially, I want to know exactly what the sequence is to re-run the amplifier calibration at a known time. What register accesses need to be made, in what order, with what timings, and how does this interact with the rest of the gate driver state.
Tool/software:
Hello Everyone
i would like to measure the current curves of my 3 different motors over 60 milli seconds (the motors are then also under different loads etc...).
How can I do this with the GUI? (DRV 821x-EVM-GUI) Is this even possible? if not, do you have any other ideas?
Thank you very much in advance
greetings from switzerland
flo
Tool/software:
Please help verify DRV8353 has sufficient Idrive and Tdrive for paralleling IPTC012N08NM5ATMA1 or IPTC011N08NM5ATMA1 FET.
My calculation in the following (2 FET for HS/LS i.e. 4 total per half bridge/12 total per 3-phase). Fsw=20kHz. Assuming 0.8% rise/fall time.
FET_num=2;
Qg=216;
Qg_tot=FET_num*Qg
Fsw=20e3;
Factor=0.8/100;
rise_time_ns=Factor*(1/Fsw)/1e-9
I=Qg_tot/rise_time_ns
Tool/software:
Hello,
In my application, I am using this DRV8873H to drive my resistive load, my resistive load is about 4 Ohms.
The load is located about 2m apart from the main control, together with 5 other I2C peripherals.
I am using TI's TCA9517 to be able to extend the I2C cable with 4,7k pull up on both sides.
This is how my application looks like:
Normally, when the Input Signal (at DRV8873H) is OFF, everything works fine. I can talk to the peripherals using the I2C lines.
But when I supply a 20% Duty Cycle, 200Hz PWM signal to heat the resistive load up, the driver interferes with my +3V3 line with these "spikes" at exactly 200Hz => this is interfering with my I2C communication, I cannot perform communication any more.
This is how it looks on the oscilloscope at the I2C CLOCK line when this happens: (it's a bit above GND because of the TCA9517 but that's expected)
This is how the signal looks at the output of DRV8873H:
When I turn the Input Signal OFF, everything works fine again.
How do I get rid of these spikes?
Tool/software:
Hi,
my customer meets the"EEPROM is not ready" with DRV10987EVM and with customer boards. the detail information about this issue is attached.
Pls note that customer already follows the procedure for EEPROM access listed in 8.3.6 in DRV10987 datasheet.
Q1: Is there any limitation for access EEPROM of DRV10987?Q2:Is accessing EEPROM of DRV10987 needed when IC is power up every time?
Q3:help to check what customer can do to dig out possible reason to lead "EEPROM is not ready"?
Tool/software:
I have run the BLDC motor as a generator and now the EvalBoard draws power from the Power SUpply until it reaches the current limit.
Which components break on the MCT8316ZTEVM evaluation module if you have a BLDC motor connected to it and operate it as a generator?
Tool/software:
Hello,
can the DRV8262 drive three BDC motors with four half bridge configuration?
Best Regards,
Markus
Tool/software:
Is there a Texas product to adapt the circuit and pinout of the DRV8353RS to the DRV8323RS?
ThanksTool/software:
Dear. Ti team
we are currently using the DRV8350RH
We have encountered a slight issue where we change the enable pin of the gate driver IC from low to high, the nfault pin drops from high to low and then back to high, causing an error in the MCU that recieves the nfault input.
The nfault pin drops approximately 5V level to about 2V within about 1us.
since the nFault pin is low active, it has been connected to gate driver output voltage of 5V through a pull-up resistor of 10kohm.
additionally, there is no voltage drop in the gate driver output voltage of 5V when changing the enable pin from low to high.
please help us with how to resolve this issue.
Best regards
Tool/software:
Dear Support Team,
DRV8452 issues an alert when it detects a STALL, but I don't think it automatically cuts off motor excitation, but I'd like to confirm just to be sure. Could you comment on the behavior after a STALL is detected and the time after STALL is detected?
Q1. When DRV8452 detects a STALL, does the motor excitation automatically turn off?
Q2. If the answer to Q1 is Yes, could you tell me how long it takes for DRV8452 to turn off excitation after detecting a STALL?
Thanks,
Conor
Tool/software:
Hi team,
My customer is considering DRV8962, and they're using EVM GUI with reading EVM user guide.
From user guide, we expect output status like bridge-1 and -2 current (A) but they can't see it like below picture.
Then my questions are as below.
- How can we add output status?
- Can we get data log of current (A) and voltage (V) to CSV file or something?
Best regards,
Kento
Tool/software:
Dear Team,
My customer is evaluating the MCT8315EVM with their motor. Since they would like to refer the PCB layout of it, they want to know the PCB information of the MCT8315EVM.
Can you please let me know the followings of the MCT8315EVM?
- Number of layers
- Layer configuration (copper thickness)
- Plating thickness (surface treatment)
Best Regards,
Koshi Ninomiya
Tool/software:
Hello,
do you have altium files (sch+pcb) for UCC5880INVERTEREVM reference design?
Or maybe for UCC5880QEVM-057?
Regards,
Adam