Hi Rick Duncan,
Thanks for your patient reply. the detail application information is following:
Max current: 3A
Max voltage: 36V
Current decay mode: slow
Protect need: OCP, OTS, short to groud
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RE: DRV8816: Is it possible to use two half-bridge in parallel?
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DRV8305: EN_GATE reset pulse time
Part Number: DRV8305
Dear all,
How long must I send EN_GATE reset pulse to clear fault state?
You mentioned that "To recover from a fault type error, the condition must be removed and the CLR_FLTs bit asserted in register 0x9, bit D1 or an EN_GATE reset pulse issued" at data sheet p.26.
However, pulse width time is not specified.
Could you teach us?
Best regards,
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DRV8846: Minus voltage max. on OUTx
Part Number: DRV8846
Hi, Team
In a real case, we observed minus voltage on OUTx (-0.85V at 150ns)
In spec, there is "-0.3V" listed as absolute maximum value of continuous phase node pin voltage.
Will there be risk to have voltage below -0.3V? Is there a peak value available for this?
And how can we clamp this minus voltage? Diodes cannot guarantee -0.3V.
Thank you.
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Linux/DRV8711: Vcp pin
Part Number: DRV8711
Tool/software: Linux
Hi,I'm confused.When the Vcp pin and Vm pin of DRV8711 short circuit,what kind of fault can be caused?C
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DRV3205EVM: Need acces to schematic, CAD and BOM for DRV3205EVM
Part Number: DRV3205EVM
Hi, How do I get access to reference design schematics, cad and BOM for DRV3205EVM?
Best Regards,
Robin Bjornberg
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DRV8818: BEMF
Part Number: DRV8818
HI Sir
I meet BEMF issue on DRV8818 ,the peak value is 49V
1. May I know the solution only need to add TS2 ,don;t need to add TS1 ,Is it right ?
2. Do you have TS2 recommend part number ?
3. Have any TI reference design schematic have this kind of TVS circuit?
Thanks
[View:https://e2e.ti.com/blogs_/b/motordrivecontrol/archive/2015/07/13/motor-drive-forum-top-faqs-part-2-how-to-estimate-motor-regeneration-and-vm-pumping:1230:0]
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DRV8307: Use externally Gate-Driver vor Low Rdson MOSFET
Part Number: DRV8307
Hi,
I would use a low Rdson MOSFET Type (<2mOhm) with a Gate Charge of 120nC. For fast switching I need a Gate Current of 1A...2A. Regrettably I only found in the Datasheet the information "30-mA Gate-Drive Current to 6 N-Channel MOSFETs". So I think the DRV8307 can not do it. But I would like use the advantages of it.
Now my idea was to use the DRV8307 in a combination with additionally extern MOSFET-Driver.
Is this Idea usable relating to Delaytime?
Another Problem is the Charge Pump. The High Side Gate Signals (UHSG, VHSG, WHSG) are 10V about the Supply Voltage, in my Case 24V+10V. But my externally Gate-Driver dont tolerate Inputsignals of 34V. My idea to slove this Problem was an simply voltage divider with Resistors.
Does this make sense or is there another way to bypass the charge pump?
Thanks,
Artur
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DRV8703D-Q1: Regarding current driving through the IC
Part Number: DRV8703D-Q1
Hai,
Thanks for responding my previous queries.
I want to connect a 12V DC motor which draws little less than 3A of current on no load. And may go up to 40A on full load.
Please confirm me whether DRV8703-Q1 driver can withstand and drive such high power DC motors.
What is the range of the current for which driver IC can operate safely?
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DRV8873S-Q1EVM: GUI for DRV8873S-Q1EVM
Part Number: DRV8873S-Q1EVM
Could you please point me to GUI of DRV8873S-Q1EVM ?
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RE: Guide/Tutorial for learning how to control a Brushless DC Motor Sensored
InstaSPIN-FOC is easiest to use, especially initially. It will run the motors quickly with very limited user tuning required (tune just the speed loop).
Getting the Hall sensors to work will be more challenging.
The code base is certainly more complex than you may be prepared for though. This isn't simple motor control.
drv8301-69m-kit will allow you to eventually use the hall sensors, so that would be my reco.
if you want to get started for lowest cost to kick the tires first then BOOSTXL-DRV8305EVM and LAUNCHXL-F28069M or LAUNCHXL-F28027F is the reco.
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RE: DRV8307: Use externally Gate-Driver for Low Rdson MOSFET
Hi Artur,
It may be possible to do as you desire, but there are protection features that have to be disabled. The VDS is one of them.
Another item to consider is many external drivers do not have a charge pump. This will limit the duty cycle to less than 100%.
The additional circuitry can increase complexity and cost.
If you want to consider this path, please take a look at the following design for concepts:
www.ti.com/.../TIDA-01227
The translators and feedback block of the schematic show how the VDS feature was disabled on the DRV8711. A similar concept can be used for the DRV8307.
It may be possible to do as you desire, but there are protection features that have to be disabled. The VDS is one of them.
Another item to consider is many external drivers do not have a charge pump. This will limit the duty cycle to less than 100%.
The additional circuitry can increase complexity and cost.
If you want to consider this path, please take a look at the following design for concepts:
www.ti.com/.../TIDA-01227
The translators and feedback block of the schematic show how the VDS feature was disabled on the DRV8711. A similar concept can be used for the DRV8307.
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RE: DRV3205EVM: Need acces to schematic, CAD and BOM for DRV3205EVM
Hi Robin,
Because of the specialized nature of the functional safety applications the DRV3205 is designed for, we handle the files for the DRV3205 through mySecure Software. I've sent you a friend request here on e2e, please accept the request so I can direct message you to get the necessary information to grant you access.
Thanks,
Garrett
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RE: DRV8846: Minus voltage max. on OUTx
Hi Alvin,
Generally, if this negative voltage is due to recirculation current during deadtime, it is not a concern. If the FET can handle ON current without OCP, it can handle the same current in the diode during recirculation.
Generally, if this negative voltage is due to recirculation current during deadtime, it is not a concern. If the FET can handle ON current without OCP, it can handle the same current in the diode during recirculation.
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RE: DRV8320R: Recommendations on how to replace DRV8301 or similar with the new generation DRV832x
Hi Per,
We do not have a specific example of the DRV8320R. There are two EVMs that can be used as an example
The BOOSTXL-DRV8320S and BOOSTXL-DRV8323RS are similar. The DRV8320S does not have the regulator, while the DRV8323RS has three current sense amplifiers.
The information for these EVMs is available on line.
We do not have a specific example of the DRV8320R. There are two EVMs that can be used as an example
The BOOSTXL-DRV8320S and BOOSTXL-DRV8323RS are similar. The DRV8320S does not have the regulator, while the DRV8323RS has three current sense amplifiers.
The information for these EVMs is available on line.
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DRV8320R: Recommendations on how to replace DRV8301 or similar with the new generation DRV832x
Part Number: DRV8320R
We have EMC issues on our DRV8301 based motor controller so we have to do minor modifications on our cramped board. DRV8320R is more robust and physically smaller, enabling more room for better power routing, and extra EMC filters & snubbers. Somewhat lower cost also helps.
However, the datasheet of DRV8301 is 39 pages while DRV832x is 90 with a lot of new info. So I am a bit frightened that we will miss important stuff if we decide to upgrade the DRV IC. Does there exist any recommendation or examples on how to upgrade schematic/layout/software to accommodate such an upgrade? If not, I believe a simple check list for potentially needed hardware and software changes would be very useful.
Thank you & regards,
Per
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RE: DRV8305-Q1: Charge pump behavior after EN_GATE is set low
Hi Paul,
Our expert has been contacted. Please expect a reply by tomorrow.
Our expert has been contacted. Please expect a reply by tomorrow.
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RE: UC2625: SPEED-IN threshold
Hey Youssef,
Thank you for the clarification, I think I can answer your question.
You are correct that when the voltage on the SPEED-IN pin is above the SPEED-IN threshold, the device will latch the value on the DIR pin and hold it. It is also important to note that when the voltage on the SPEED-IN pin is below the SPEED-IN threshold, the latch is transparent and the outputs will change accordingly.
I cross referenced the computation truth table like you have and we are seeing transparent lock behavior which may mean that the voltage on the SPEED-IN pin is below the SPEED-IN Threshold. I noticed that there is currently 270mV on the SPEED-IN pin. While this above the typical value, this is not above the max value. Remember, 99.6% of devices fall within min and max spec where the typical value is an "average" value that might not match the device that you are currently testing (based off our last E2E post).
The SPEED-IN Pin can handle a max of 8V, try putting 1V on the SPEED-IN and repeat your experiment. Since 1V is significantly above the SPEED-IN Threshold in the spec, I suspect the behavior will go away. Let me know if it does not.
Best,
-Cole
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RE: UC2625: SPEED-IN threshold
Hey Cole,
Thanks for the reply, I actually got it to work today.
Yes I have tried it at 1V which is well above threshold, but that would not work well with my current test. But as I mentioned above, I changed my test method and I got values much closer to typical with SPEED-IN functioning the way it should.
Started with Speed-IN being above threshold, setup my inputs with DIR pin going high, then switched DIR low and my outputs did not change (which is expected). Then proceeded to sweeping SPEED-IN voltage down below that threshold to look for a change in my outputs, and it did happen around 260mV.
I guess I just had to look at it at a different perspective.
Thanks again for your time.
Youssef
Thanks for the reply, I actually got it to work today.
Yes I have tried it at 1V which is well above threshold, but that would not work well with my current test. But as I mentioned above, I changed my test method and I got values much closer to typical with SPEED-IN functioning the way it should.
Started with Speed-IN being above threshold, setup my inputs with DIR pin going high, then switched DIR low and my outputs did not change (which is expected). Then proceeded to sweeping SPEED-IN voltage down below that threshold to look for a change in my outputs, and it did happen around 260mV.
I guess I just had to look at it at a different perspective.
Thanks again for your time.
Youssef
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DRV10970EVM: Not able to exit trapezoidal operation and enter sinusoidal
Part Number: DRV10970EVM
I am running the DRV10970 with a Maxon 339267 BLDC, with an input voltage of 12V. I am able to spin the motor without issue in trapezoidal mode, however in the desired sinusoidal mode I am encountering two issues. I have the Rcs resistor set to 33k, which should keep the current limit to 900ma
1) At low PWM the motor is "skipping", successfully making 3/4 of a rotation before slowing and then resuming.
Blue = Current through single winding
Green = FG pin
2) At higher PWM the motor spins continuously, however the waveform, which starts out as the third-order harmonic shown in the datasheet then turns into something much more trapezoidal.
Blue = Current through single winding
Green = FG pin
Is it possible for the output to be sinusoidal for the entire range? I understand that trapesoidal could be needed to at higher RPM's however, this should not be an issue at low RPM. I also increased the current limit, by reducing the value of Rcs, and did not see any improvement.
The DRV10975 was also tested and it was able to maintain sinusoidal current draw for the entire RPM range tested.
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RE: UC2625: SPEED-IN threshold
You're welcome. That's a great way to figure out the value of the SPEED-IN threshold. Glad your issue was resolved.
Best,
-Cole
Best,
-Cole
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