Quantcast
Channel: Motor drivers forum - Recent Threads
Viewing all 22126 articles
Browse latest View live
↧

RE: DRV8305: DRV + GaN

November 21, 2017, 7:09 am
$
0
0

Thanks for the tip Rick.  The trouble is that I'm looking for the kind of integration and protections offered by the DRV line.  I could not find such a chip in the libraries you refer to above.

I noticed many of the DRV chips support PWM frequencies up to 200 KHz.  There is a particular chip that goes up to 500 KHz. the DRV84X2 family.  Is there a reason these chips would not work with GaN FETs?

Thanks,

Samuel

↧
Search

DRV8305: DRV + GaN

November 14, 2017, 4:11 pm
$
0
0

Part Number: DRV8305

Hello,

Is it possible to drive a GaN-based power stage using the DRV chipset?  If yes, is there a DRV chip and/or specific topologies you would recommend?

Thanks,

Samuel

↧
↧

RE: DRV8835: Phase/Enable Mode - 3 pins

November 21, 2017, 7:14 am
$
0
0
Hi Brendon,

Yes, you can tie both Phase pins together to control them with a single input. Thank you
↧

DRV8835: Phase/Enable Mode - 3 pins

November 21, 2017, 6:53 am
$
0
0

Part Number: DRV8835

My question is around the interface to the microcontroller with using DRV8835. If I pull the MODE pin high can I control the speed and direction effectively with just 3 signals from the microcontroller? AENABLE and BENABLE lines would be PWM outputs. Can A and B Phase signals be tied together to set direction with a single pin?

↧

RE: DRV8323: Error while commanding more than 40% of the PWM

November 21, 2017, 7:41 am
$
0
0
Hi Luis,

I checked it using oscilloscope, the same.
After the 40% PWM, the error pin goes Low.
Charge pump voltage to the Mosfets goes zero.
When the stops, the current and voltage both goes zero.
After this the driver will not recover automatically when the PWM goes below 40%. In order to get back the driver running the enable should go low and then High.

I noticed the following today with Less than 40% PWM.
- I have disabled the current Limit by connecting the VDS to DVDD( DVDD is showing 3.25VDC).
- With the above setting the motor is not consuming the current more than 1Amps.
- When the motor is running the motors shaft can be stopped by hand. during this motor consumes about 0.9 Amps.
- The motor continue to run when the shaft is left free.
- During the above process the PWM from the controller to DRV8323 is continuously provided and is not stopped.
- But the charge pump from DRV8323 goes Zero.

My feeling is the PWM problem will be resolved if we can remove the current limit.

Please let me have your views and solution on the above.


Best Regards.
Shivaraj.N
↧
↧

DRV8871: DRV8871

November 21, 2017, 7:45 am
$
0
0

Part Number: DRV8871

The driving problem of consulting DRV8871:

1. Is there any difference in the configuration of different motor register parameters?

2. What parameters are required to be configured when driving the motor?

↧

RE: DRV8871: DRV8871

November 21, 2017, 3:51 pm
$
0
0
Isn't the DRV8871 motor driven chip?Isn't it used to drive the motor?
I mean, is the register parameter configuration different when driving different motors? How to configure it if it is different?
What parameters do you need to configure to drive the motor?
Thank you!
↧

RE: DRV11873: Maximum FG frequency

November 21, 2017, 4:14 pm
$
0
0
Hello na na78,

Our motor experts have been notified and should answer your question soon.

Best,
-Cole
↧
Search

RE: DRV8881: DRV8881 current sense

November 21, 2017, 4:32 pm
$
0
0

Rick-san,

Thank you for reply.

I see. I can answer to the customer  because I think it is enough.

Best Regards,
Akihisa Tamazaki

↧
↧

RE: DRV8871: DRV8871

November 21, 2017, 4:47 pm
$
0
0
Hi Jeffrey,

The DRV8871 is a motor driver chip.
As datasheet states, it requires 2 logic inputs IN1, and IN2.
This device does not have a motor calibration feature as is meant for the simplest single phase brushed DC motors.
The only configuration needed if desired is current limiting which is done through the ILIM pin.
For more information on how current regulation works on this device, please refer to section 7.3.3 on the datasheet. Thank you
↧

RE: DRV8323: Error while commanding more than 40% of the PWM

November 21, 2017, 4:52 pm
$
0
0
Hello Shivaraj,
Could you please provide a scope capture when nFault goes low. In that capture please also show VM voltage, voltage of charge pump and phase output current. Thank you.
↧

RE: DRV10983EVM: USB2ANY trouble

November 21, 2017, 5:10 pm
$
0
0

Thank you for support Cale.

I tried uninstall of all previous driver and install your recommended driver and GUI.
As a result, I was able to open GUI.

Thanks,
PAN-M

↧

DRV10983EVM: USB2ANY trouble

November 19, 2017, 8:35 pm
$
0
0

Part Number: DRV10983EVM

Dear all.

I have USB2ANY.
I installed "LabVIEW Run-Time Engine 2017 - (32-bit) - Windows - Windows 10/8.17 (SP1) 32-bit/7 (SP1) 64-bit/Server 2012 R2 64-bitServer 2008 R2 64-bit" and my PC is windows7/64bit.
But DRV109xxEVM GUI can't open.
The error message is "LabVIEW engine was not found".
Do you understand this cause?

Regards,
PAN-M

↧
↧

RE: DRV8840: nFAULT pulled down unexpectedly

November 21, 2017, 10:00 pm
$
0
0
Hi Rick,

Unfortunately, adding a capacitor in parallel doesn't help. The nFAULT pin still got pulled down during normal operation. Is there other suggestion? Thank you

regards,
Kevin
↧

RE: DRV8332: Urgent help needed

November 22, 2017, 5:16 am
$
0
0
Hi Saurabh,

Can you provide more details?
How long do you run the motor prior to this problem appearing?
What is the motor operation profile (ex start then run in one direction continously, start run forward for 10s then stop and run in reverse direction for 10s)
If stopping and reversing directions, how are you stopping the motor?
How many devices have been damaged?
What is the PVDD voltage are you using?
Are you adhering to the requirements of section 9.2.1.2.2 Current Requirement of 12 V Power Supply?
↧
Search

DRV8332: Urgent help needed

November 22, 2017, 3:25 am
$
0
0

Part Number: DRV8332

Hello TI Moter Driver Team,

I am using DRV8332 for BLDC motor and running the motor using sine PWM.

If I try to run the motor continously for some time the Low side MOSFET is getting shorted in any of the ports randomly. This was observed by checking short between OUT_x and GND_X.

I have damaged quite a few 8332 ICs and have observed the same issue on all.

please let me know if there is something that I am doing something wrong.


Thanks
Saurabh

↧

RE: DRV8840: nFAULT pulled down unexpectedly

November 22, 2017, 5:21 am
$
0
0
Hi Kevin,

Thank you for the information.

Can you provide a scope capture of the current, nFAULT voltage, and nSLEEP voltage zoomed in to show 10us prior to nFAULT asserting?
↧
↧

DRV8840: nFAULT pulled down unexpectedly

November 16, 2017, 2:35 am
$
0
0

Part Number: DRV8840

Hi there,

We are having trouble with DRV8840 whose nFAULT is pulled down unexpectedly, and only way to recover DRV8840 is to reset it.  We monitor the current, temperature, and VM, and none of them ever reach the protection threshold; 1A, 35 deg C, and constant 24V, respectively.  Is there any other reason the DRV8840 would enter the fault state?

Thank you

regards,

Kevin

↧

RE: DRV8818: capacitor for charge pump

November 22, 2017, 5:23 am
$
0
0
Hi Aoyama-san,

Yes two 0.1uF capacitors can be used.
↧

DRV8818: capacitor for charge pump

November 21, 2017, 5:13 pm
$
0
0

Part Number: DRV8818

Hello,

Our customer use the DRV8818, have a question.

Ti recommend 0.22uF capacitor for charge pump.

Is it possible to use two 0.1uF capacitor in parallel instead of 0.22uF?

The customer want to use same capacitor as 0.1uF for VM bypass capacitor.

Best Regards,

Naoki Aoyama

↧
Viewing all 22126 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>