Tool/software:
Hi team,
Customer application will have 6A rms current, for thermal calculation, PD=IRMS*IRMS*(Rdson high-side + Rdson low-side) = 6*6*150mohm=5.4W
TJ=TA+(PD+RJA)= 25C+ (5.4W*27.8C/W) = 175.12C
I was wondering if this calculation is correct. If so, the temperature is too high. Could you pls help on the thermal calculation? thanks!
Rayna
Tool/software:
Hi,
We are designing custom motor driver board using DRV8462DDWR IC,
Regarding VREF connection, Used Voltage divider circuit using Two 10K Resistor.(as per Development board and Typical application circuit)
1. Is that okay for driving the stepper motor?
2. Based on the Motor Capacity is it required to change the divider voltage?
3. How to check the functionality of the MANUAL_VREF in the DRV8462VEVM development board. and what jumper modifications required? (J6 to be removed and Put it to the J7)
Kindly suggest if any other modifications required in the Hardware or GUI setting.
Regards
Tool/software:
Dear Expert
Could u hlep to check
1.Is the waveform normal? Can it be further optimized and improved?
2.Can the operating noise of the motor be optimized?
Motor's A1 &B1 voltage waveform
Motor's A1 &B1 voltage waveform
A1 zoom in
Tool/software:
Dears,
My customer Xiangrui Intelligent uses DRV8245-Q1 in a robot project and now wants the driver for this chip (preferably one that can be opened by Keli). Could you please provide it?
Many thanks，
Arabella
Tool/software:
Hi team,
Customer wants to know how DRV8705-Q1 will do if they disconnect the GND.
I believe we have some loss-to-GND protection. Can you share the principle of how we can protect our device if GND loss?
Regards,
Peter
Tool/software:
Hi,
I have some questions.
I've already solved this problem by lowering the IDRIVE value, but I want to know why this problem occurs with values with IDRIVE (1000mA/2000mA).
1. Why do I get a ripple in the gate waveform on the GHA side?
2. Why is the gate voltage on the GLA side higher than 11V?
3. Why are the waveforms on the GLA side not parallel, and the measured voltages are different?
VM(P) = 48V
IDRIVE = 1000mA/2000mA
Gate Resistor : 0ohm
CH1(High Side, yellow) : GHA-SHA
CH2(Low Side, blue) : GLA-SPA
Using FET : NTMFS2D5N08XT1G
Tool/software:
Hi
I want to rotate a FAULHABER 4490H024BS motor.
with the MCT8316ZTEVM circuit. HW configuration.
I connected a 24V power supply to the VM.
and 5V for digital HALL.
The motor does not turn.
But its axis is locked.
In the scope I saw that only phase A has a signal and the other two phases have a low but constant DC.
And the MCT8316Z component is very hot. The current from the 24V supply is 1.2A.
Tool/software:
We use the TI chip DRV2605LDGS on a pcb with other i2c slaves. According to the data sheet, this should report at address 0x5A. On some circuit boards it reports at address 0x5B. The chip works perfectly there (rudimentary tests via bit manipulation using I2C tools). The Linux driver does not support this address by default. Hence the reason for the request.
Here is some information to narrow down the cause of the fault:
- Functioning chips and non-functioning chips are labeled the same: 32 TI 05L
- All circuit boards that show this error pattern come (so far) from the same EMS:
- The question to TI:
o Is there a technical explanation why the chip reports to the wrong address? Was a batch of chips with a different address manufactured for a specific customer?
The information below is for technical error analysis:
- The chip is supplied with 3.3V.
- The I2C level is also 3.3V
- The set frequency is 400kHz, a lower frequency showed the same error pattern.
- The image “i2cdetect_0x5a_0x5b.png” shows the I2C signal characteristics for a bus scan.
- The file “i2cdump.txt” shows the memory content of the functioning chip at address 0x5b.
root@qsxm-mm60:~# i2cdump 1 0x5b
No size specified (using byte-data access)
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-1, address 0x5b, mode byte
Continue? [Y/n]
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: e0 40 00 01 01 00 00 00 00 00 00 00 00 00 00 00 ?@.??...........
10: 00 05 19 ff 19 ff 3e 8e 0c 6c 7e 93 f7 e1 20 80 .??.?.>??l~??? ?
20: 33 94 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3?..............
30: 00 78 d1 5b df 00 00 00 00 00 00 01 91 00 00 00 .x?[?......??...
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 ..............?.
Best regards and thank you in advance
Georg
Tool/software:
Folks,
my customer planned to use the DRV8243-Q1 as Highside switch using one half-bridge only.
They now run into issues hitting the max. current of 12A and would like to know if they can parallel the outputs.
This is basically done in the DRV8143-Q1 but they would have to slightly change the PCB as the pinout is not 100% the same.
What changes have been made inside the DRV8143-Q1 besides paralleling the two half-bridges?
Can I do this externally and continue to use the DRV8243-Q1?
BR
Carsten
Tool/software:
The jitter during power-on is acceptable. In the case of constant power, we want to do every time the motor stops, the next start time do not shake.
In addition, after the motor stops, how to maintain the stopped state is more appropriate.
Is it okay to just stop the pulse? We found that it was hotter.
Now we will pull down the nSLEEP signal into a low power consumption state, so that the motor will not heat up, but the next time we remove the nSLEEP and resend the pulse, we find that the motor has jitter. Is that what happened?
Tool/software:
Hi,
I am using BP-AM2BLDCSERVO E2 board and found the ISENSE_xy_VREF nets are all 0.17V when power on the board with 3.3V from LP-AM243x.
I checked the resistors R139 and R140 resistance which are 51kohm and 49.9kohm. This is the correct value "BP-AM2BLDCSERVO E2 - Modifications" recommended.
So could you support this issue? 0.17V reference voltage isn't good for sensing the whole range of motor phase current.
Regards,
Chen
Tool/software:
Hi team,
When testing the DRV8718-Q1, the customer found that the SO pin of the DRV8718-Q1 continuously outputs a waveform at a frequency of 20ms.
As a result, when the motor stops operating(There is no current passing through the sample resistor at this point), the AD pin of the MCU still captures voltage fluctuations and reports current values of around 1A.
What is the possible cause of this waveform in SO pin? Could you help review and give some suggestions?
Regards,
Ivy
Tool/software:
Dears,
The customer uses DRV8245 in the project.
Usage mode:
1, PH/EN mode, one full-bridge output
2, independent mode, independent control of two half-bridges, output of two PWM channels respectively
Functions to be implemented:
The controller needs to monitor the output current value in real time and overload protection (the rated current of the controller is 3A, and it is cut off at around 3.1A)
Problems encountered:
1. The current triggered by OCP protection is too large and cannot achieve the required function.
2. IPROPI current acquisition
①PH/EN mode, loop current acquisition can be realized through IPROPI
②Independent mode, when two channels output values at the same time, IPROPI is the sum of the two currents, and it is impossible to distinguish whether one channel is overloaded (over 3.1A).How to solve it?
Many thanks,
Arabella
Tool/software:
hi expert
as we know, DRVOFF/nFLT pin is a multi-function pin and, by default, the pin functions as a global driver disable pin.
additionally, 8718 has IC_STAT1[FAULT] bit to Mirrors nFAULT pin.
So my question is that in default configuration(DRVOFF function) what is IC_STAT1[FAULT] bit function? does this pin shown DRVOFF/nFLT state?
Tool/software:
Hi Team,
use DRV8311.
1. Can you provide a driver for DRV8311 for LINUX?
2. Is there a process document for configuring DRV8311 registers?
Tool/software:
Hi Team,
We have some questions about the DRV8705S offline diagnostic
1. Noticed it is current source as the pull up/down for diagnostic, is it fixed value or triode? It is said fixed current=3mA, while shouldn't it relate to PVDD/2? When it is no fault, how do we confirm the SHx and SHy voltage for different PVDD external sampling?
2. If PU_SHy pull up capacity can be impact by external load voltage?
Thanks
Best,
Frank
Tool/software:
hi ti team,
do you have the experience about calculate motor temperature from motor current?
if I can monitor the motor current for a time period and test the motor shell temperature, then change the load and monitor another group of current and temperature。 at the end I can get a table of current and temperature relationship, so I can use this table to estimate the motor temperature from it's current value. Is this method practical?
thanks!
Tool/software:
Hello,
I'm working on a tuning guide for my team's internal use. For some context, we are not at present using predischarge or deadtime injection (I mention these things solely as they adjust the functionality of the DRV8334 slightly)
Looking at Figure 7-6 in the datasheet, TDrive seems to be quite exaggerated, far longer than the actual switching time. Is this typical guidance? I was thinking that it might be best to use the actual MOSFET switching time measured, add some buffer for worst-case tolerancing (e.g., max MOSFET gate charge from the datasheet), and add 20% (given -20% is the min tolerancing for the TDRIVE state machine's timing accuracy for any given setting, per the datasheet).
Additionally, I am wondering when it might make sense to not set IHOLD_SEL. The idea that I can further reduce the risk of crosstalk from adjacent phases (given my understanding that ISTRONG is only applied to the MOSFET on the same phase when its complementary FET is being turned on) turning on/off my FET is great, but what's the catch? What considerations should I have in mind when making that decision?
Tool/software:
Is there any additional documentation on DRVEN_x? I'm not seeing a very thorough description of what they do / how they work in the datasheet. By what means is GHx/GLx for the given phase pulled low? Just RPD_SA, in a similar manner to how a given phase is disabled with ALL_CH?
Tool/software:
Hi, I started working with EV board, but the engine is not running, fault LED is on, Rs
1.17975881e+38
Ohm. The motor and everything else is fine.
How can I solve this? Thanks for your answer