Part Number: DRV8320
Hi all
Would you mind if we ask DRV8320?
This device has two setting "Synchronous rectification" and "Asynchronous rectification".
Both case, the operation is the same , however power dissipation increases in case of "Asynchronous rectification" because of MOSFET body diode freewheeling.
Why are there two setting?
Is "Asynchronous rectification" used to prevent from short circuit with low-high side FET's on in case of less of dead time?
Kind regards
Hirotaka Matsumoto
Part Number: DRV8350
Hi guys,
I have just bought a DRV8350H-EVM. I have successfully loaded the trapezoidal sensored FW, and motor is running correctly (although SLVUB78A says that it is needed to solder the unpopulated R82, R84, and R86 0 ohm, what I think is an errata because I do not find those resistors in the board, and in fact, my motor is running without doing that modification).
Now I want to design my own board, and I would like to get the design files of the EVM (mainly the schematic). I am not able to find them in the product site.
Thank you in advance.
Ramon Navarro
Hello Nagata-san,
1) I have to confirm this, but I believe, it BEMF zero-crossing is being missed due to noise, the FG will stay in its current state (either Hi-Z/Hi_if_pulled_high or GND) and not switch. If fg doesnt switch within lock detect time,, the device will hit lock rotor detection. Let me confirm this.
2) I think your understanding might not be correct. The FG pin is associated with the speed of the motor. If you spin the motor at a multiple of the DRV10866 sampling clock freq(101.6Hz), the FG signal should have the frequency of a multiple of the DRV10866 sampling clock freq(101.6Hz). If this happens, then you may falsely detect the FG signal isnt changing state and thus falsely trigger a locked rotor condition. visually you can see this below:
Part Number: DRV10866
Hi,
I'd like to know the FG output and Lock detection feature of DRV10866.
1. Depend on customer application and environments, the DRV10866 cannot detect the point BEMF cross zero due to noise.
In this case, how will FG output be? I guess FG out may not output in this case. Is it correct?
2. Could you please let me confirm about the www.ti.com/.../slva612a.pdf document
My understanding for the explanation is if internal sampling clock of external system such as MCU is 101.6Hz, the system may detect as rotor is locked even if FG is working. Then, the sampling clock of external system should be 2X from 101.6Hz. Is my understanding correct?
Nagata.
Part Number: DRV10987
hi,
i am working on drv10987 , i am facing problem in alignment of bldc motor. It takes more time to align , even i have set 0.04 s in align time in gui,motor spec is 24V BLDC ,1.24(Rphase), 412(mV/hZ),A1=0.019Hz/s,A2=0.22Hz/s2
please help in this regard
Part Number: DRV10987
Hi,
I am reading both current and voltage from DRV for monitoring in a ceiling fan application.
Value read from voltage read of DRV, converted as mentioned in datasheet.
Although the value is fluctuating, still it is useful to application.
But, the converted value of current is not at all matching with reading with a Fluke-115 DMM (True RMS),
The conversion formula mentioned in datasheet is A = 3 * (Register Value - 1023)/ 2048.
Register value is 11 bits value.
Can anyone help me out?
regards
PK JENA
Adam,
I would prefer a device with the control MCU built into the driver. It will be great if there is an evaluation board with example firmware.
My motor does not have hall sensors. A solution which uses just the motor and a rotary optical encoder is what I am looking for.
In future, this may need to be upgraded to a pulse & direction input compatible drive.
I have a requirement to rotate a bldc motor in 0.1rpm (Trapezoidal or FOC). Is it possible using any TI devices? If 'Yes', suggest me one. I would like to control the movement according to the encoder pulses from a quadrature(ABZ) encoder.
Thank you
Adam san
Thank you for your reply!
there is SEN_OCP, please check datasheet 8.3.6.4
->Yes, we know it. So, we would like to confirm whether DRV8323 has Itrip function or not.
As our recognition, there is no Itrip function.
Kind regards,
Hirotaka Matsumoto
Part Number: DRV8323
Hi all
Would you mind if we ask DRV8323?
<Question1>
We would like to confirm Connection between hall sensors and INLA, INHB and INLB.
It seems that the connection are simple. Hall sensor's output connects to each pins.
As the background of this question, we could not find any comparators on the block diagram.
So, are there negative inputs(1/2DVDD) internally?
<Question2>
In relation to <Question1>, should hall sensor's power source and pull-up use DVDD?
<Question3>
There is no FG pin compared with DRV8306.
If we use DRV8323, what signals should we use instead of FG?
(->Hall sensors? With connecting hall sensors to CPU port, should we use these signals instead of FG?)
<Question4>
There is no PWM Limiter function and Sense OCP function compared with DRV8306.
So, it requires to consider these function at CPU side using SOX signal(amplified current information), right?
Especially, there is the description on the DRV8306's datasheet as follows;
"If the current limit activates, the high-side FET is disabled until the beginning of the next PWM cycle.
Because the synchronous rectification is always enabled, when the current limit activates,
the low-side FET is activated while the high-side FET is disabled."
->So, in case of DRV8323, if we realize the same operation, does it require following procedures?
-CPU detects Itrips threshold
-PWM=stop 1 cycle
-INLC=Low(Brake)
- After 1 cycle, CPU confirm current value
Kind regards,
Hirotaka Matsumoto
Hi adam,
Thanks for the reply. It was really FAST.
I have gone through the application note and it's Worth Reading.
Thanks,
Vignesh
Part Number: DRV8353R
Is it recommended to implement reverse polarity protection like this in the picture? any cons of this circuit implement with DRV8353?
Part Number: DRV8816
Dear All:
I want to use the DRV8816 to drive the resistive load, but I find the Sense Pin is not correct. can the Drv8816 drive the resistive load or only drive the motor load? Thanks~