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DRV8353R: DRV8353R Charge pump fail permanently. What might be the problem?

July 31, 2019, 8:25 pm
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Part Number: DRV8353R

Hi 

I am recently using the DRV8353RH into my design, for BLDC motor control application with 60V power supply.

And I face an issue : 

1) 60V motor startup NG (couldn't recover), the IC CPL pin (Pin number 3) have obvious low impedance(60ohm), normally should be at least 100+Kohm. (IC damage but not blowup)

2) After changing IDRIVE setting from 450mA/900mA to 150mA/300mA and add a high value bulk capacitor (600uF) --> Motor startup to free run Pass.

3) With the setting above, and we add load to the motor then the whole DRV8353RH blowup. (the MOSFET is fine and very clean, very sure the heat is not from the MOSFET)

The blow up IC has very obvious burned damage at IC's Pin1~Pin7 which I guess is the charge pump module. (the IC have smoke occur)

The PCB PAD beneath the IC is heavily burned, the copper dislocates.

I have this test fail twice, which I am very sure isn't a coincidence. Both times the IC's Pin1~Pin7 have obvious damage and the MOSFET are both time fine. What might be the problem?

Best regards,

Jim Hsu .

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DRV8312: DRV8312 with MSP430

August 1, 2019, 1:40 am
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Part Number: DRV8312

Hi,

I have the DRV8312EVM with cards C2000 and TMS but i need to control the DRV8312 with MSP430 MCU.

1 - Is there's a Card fit into the slot contain MSP430

2  - if there's another kit contain both DRV8312 and MSP430

if no hardware available, is there's a firmware can be uploaded to msp430 to drive DRV8312 to run BLDC sensorless.

Thanks

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DRV8830: About behavior of OCP

August 1, 2019, 4:24 am
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Part Number: DRV8830

Hi Team,

 

We understand that if Over current(1.3A to 3.0A) occurs more than 2us(typ), OCP starts up.

Then, I would like to know the period between “Start-up OCP” and “Internal MOSFET is turned off”.

(Please refer to the following “Delay time”.)

 

Could you please let us know if you have any value?

(For example, around OOus, more than OOus etc. )

*This value does not need to be a guarantee.


 

Regards,

Kanemaru

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DRV8343H-Q1EVM: spinning 3 phase sensored motor

August 1, 2019, 4:48 am
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Part Number: DRV8343H-Q1EVM

Hello,

I have same question about how I need to work with DRV8343H-Q1EVM and 3 phase sensored motor. I have this motor: maxon 351100.

1) Where I can find full datasheet of DRV8343H-Q1EVM (not the user guide)?

2) Where I can find "DRV8343x-Q1EVM reference software development package" that mentioned on the user guide?

3) How can I know the optimal values of Idrive and Vds that I need for spinning a motor on 1XPWM - Hall Effect Sensor mode?

4) When I connect the motor to the DRV8343H-Q1EVM and open DRV8343-Q1 EVM firmware, the firmware automatically recognized only "sensorless motor", why it does not suggest me "sensored motor" option? I connected all 3 phases wires to Phase A,B and C and 3 hall- sensors wires to INLA,INHB,INLB. What I do wrong?

Thank you!

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DRV8308: FGOUT does not match CLKIN exactly while speed control is locked

August 1, 2019, 6:37 am
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Part Number: DRV8308

Hi!

I'm using DRV8308 EVM with BLDC motor Nanotech DF45S024050-A2 in frequency mode (closed loop) with CLKIN = 65Hz (= 33 RPM) from an external source. The FG signal is generated by the Hall sensor output of the motor (FGSEL = 0). Commutation mode is set to 180° sine commutation.
 
After tuning all the parameters (filter, compensation, SPEED, SPDGAIN; LOOPGAIN etc.) the speed control loop locked on the input frequency CLKIN. But FGOUT and CLKIN never match exaclty. FGout is always approx. 0.2Hz faster than CLKIN. It does not depend on the load of the motor. The speed control loop seems to work fine, though. If I manually put some load on the motor, you can see that the loop tries to keep the RPM according to CLKIN.
Also checked this behavior with higher frequencies for CLKIN (approx. 87 and 160 Hz). It came to the same result: FGOUT is about 0.2 to 0.3 Hz faster than CLKIN.

In order to get a low level on LOCKn output, parameter SPEEDTH has to be set to 0.78% or higher. Otherwise the loop does not lock properly.

My question is now: Is this a kind of "normal" behaviour? Will there be always a small deviation of FGOUT from CLKIN? Or do I have to find some better values for all the parameters?

Here are my settings:

AUTOADV  = disabled
AUTOGAIN = disabled
SPDGAIN  = 10
LOOPGAIN = 200
SPEED    = 800
FLK1     = 3407 -> Pole 1 = 1700 Hz
FLK2     = 230  -> Zero 1 = 14 Hz
COMPK1   = 246  -> Pole 2 = 120 Hz
COMPK2   = 1972 -> Zero 2 = 120 Hz

I'd appreciate any help in this matter.

Volker

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DRV8350R: Minimum voltage with 5ns transient for GHx/SHx/GLx/SLx/SNx/SPx

August 1, 2019, 7:11 am
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Part Number: DRV8350R

Hi Team,

The minimum voltage for  GHx/SHx/GLx/SLx/SNx/SPx is the voltage for 200ns transient. If the transient is 5ns and the minimum voltage is 2V smaller than the specs, will DRV8350RS be damaged? 

For example, the minimum voltage of GLx is -5V for 200ns transient in the table. If the voltage of GLx is -7V with 5ns transient, will DRV8350RS be damaged? 

Thanks and Best Regards!

Hao

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DRV8872-Q1: Overcurrent protection trip level

August 1, 2019, 7:33 am
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Part Number: DRV8872-Q1

Hi team, 

How to set the protection trip level, when using DRV8872-Q1 in On-Board Charger application to lock the charging gun?

I notice that on datasheet, the overcurrent protection trip level varies from 3.7A to 6.6A, range is huge.  When i consider the margin, which value should i take

Best Reagrds,

Gene

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DRV2625EVM-CT: DRV2625

August 1, 2019, 7:38 am
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Part Number: DRV2625EVM-CT

any updates on supporting DRV2625EVM-CT Haptic control console on windows 10.  There is a need for window 10 support for this evaluation board.

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DRV8306: DRV8306 Direction change when motor running

August 1, 2019, 9:01 am
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Part Number: DRV8306

Hi.
I am looking for reversing behavior for drv8306, specifically direction change when motor is running.
The datasheet does not indicate what will happen.
Will the motor apply reverse torque limited to (Isen over current limit) to quickly reverse, or will drv8306 make coasting to stop and short delay before starting again in reverse direction.

Looking forward to your advice.
Helge.

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DRV8305-Q1: DRV8305NEPHPRQ1

August 1, 2019, 1:43 pm
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Part Number: DRV8305-Q1

Hi,

We are currently using the DRV8305NEPHPRQ1  in BLDC motor application. It appears Pins 29-32 are damaged internally on the chip. FETs for both the High side and Low side of the MOSFET Bridge circuit that connect to the pins seemed to be OK when isolated tests are performed for this phase of the motor.

Are there are any electrical measurement checks we can do, from our end, on these pins to verify the pins are functioning properly as we measure low resistance for that phase of the leg of the 3 phase motor. We would like to send over the DRV8305 to TI to analyze. If there is anyone at TI we can reach out directly to that would be great.

These tests were performed when running a high temp soak test (at 150C) with the load changing in a step wise pattern for the Motor. Our unit is failing now and everything is pointing towards these pins even after the unit is power cycled at room temperature. We are looking at all the possibilities where the DRV8305 maybe malfunctioning or the pins 29-32 are failing. The DRV8305 is being used in all our current units.

We are speculating that the charge pump on the DRV8305 may have been damaged in the process as well. The datasheet specifies the caps as 0.047micro Farad. Could you specify what the tolerance range for the charge pumps caps are?

Kindly provide any supporting information or what this error seems to suggest.

Best regards

Mohammad

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DRV8323R: DRV8323RH Issue

August 1, 2019, 11:40 pm
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Part Number: DRV8323R

As shown in the figure below, I tested the waveforms of INHA and GHA.The yellow one is INHA and the blue one is GHA. The high level of GHA is 2us longer than the high level of INHA and it is repetitive.

Why is this？

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DRV8847: DRV8847S outputs lost steps

August 1, 2019, 11:47 pm
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Part Number: DRV8847

Hi,

My customer has observed lost steps phenomenon in DRV8847S outputs in two different circuits.

Waveforms as below:

#1 circuit

#2 circuit

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DRV8847: DRV8847 latest version datasheet and time between device power up to I2C normal communication

August 1, 2019, 11:59 pm
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Part Number: DRV8847

Hi,

Our customer wants DRV8847S latest version datasheet.

And they want to know how long time does it take from DRV8847S power up to I2C normal communication?

Thanks a lot!

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DRV8876: Current regulation

August 2, 2019, 12:00 am
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Part Number: DRV8876

Hi

DRV8876 offers current regulation feature set by IMODE.
Current chopping threshold (Itrip) is set through Vref and RIPROPI and the current would be regulated with Itrip.

However, the current regulation feature is one of protection feature.  

So I think we should design the circuit to avoid the situation of current regulation as soon as possible if it is detected.

Is my understanding correct?

BestRegards

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DRV8872: Fault pin query

August 2, 2019, 1:31 am
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Part Number: DRV8872

Hi Team,

In the datasheet of DRV8872 the over-current condition, nFAULT pin of the IC (pin #4) will go low and the driver will try to recover in t_retry time.  Customer tested this and found that the fault pin is not going low however the retry is happening attached is screenshot of the over-current test.

 

Dark Blue: Fault pin voltage

Light Blue: Output Current (5 A as measured in overcurrent condition)

Green: Output Voltage of one of the output pins

Can you please let me know why the pin is not going in fault.

Regards, Shinu Mathew.

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DRV8350R: DRV8350R power dissipation quesiton

August 2, 2019, 1:42 am
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Part Number: DRV8350R

Dear Sir

I'm checking the power dissipation of DRV8350 and I have a question about charge pump power dissipation (Pvcp)

in the datasheet equ. 45

Pvcp = Ivcp *(VM+Vdrain)

but the charge pump output power should only be Ivcp*Vvcp

why the charge pump circuit has so much losses?

thanks!

Albert

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DRV8872: How to measure IOH leak current.

August 2, 2019, 7:01 am
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Part Number: DRV8872

Hi,

How to measure IOH leak current  as below datasheet parameter?

What kind circuit I should make to measure it?

thanks,

------------------------------------------------------------------------------------

In SLVSCZ0C.pdf, page 5, section" 6.5 Electrical Characteristics, nFAULT OPEN DRAIN OUTPUT".

PARAMETER                                         ,TEST CONDITIONS ,   MIN  ,TYP , MAX     ,UNIT

IOH -Output high leakage current      ,VO = 3.3 V                  ,                          1       ,   µA

best regards,

Simen

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CCS/DRV8302: DRV8302 GVDD pin voltage is about 6.2V, what is the reason?

August 3, 2019, 6:07 am
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Part Number: DRV8302

Tool/software: Code Composer Studio

Hi，

I am using DRV8302 to drive a 48V PMSM using TMS320F28069F chip, the scheme is as the same as TI's boostxldrv8301_revB. But the board and layout are  customarized.  At the same time, I am using TI's example lab programs  to run the motor.  My question is, when there start to run the program, the DRV8302 will output nFault signal, and the GVDD voltage is about 6.2V. Therefore, I guess the fault is caused by under voltage on GVDD pin. the fault will occur whenever the motor is connected or not. even when control board only is powered and example program is run, the fault will occur. Is this indicated that the DRV8302 is broken? someone can give me some help on that issue? Thanks.

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DRV8305: DRV83053 fails quite often

August 4, 2019, 5:01 am
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Part Number: DRV8305

Hi,

Have been using the DRV83053 for a while; I've had successes with it, failures too. The board what I am using is my own, but is very similar to the BOOSTXL-DRV8305.

I've posted a picture of the board in this thread.

I am attaching the schematic here:

Previously, it was not quite evident what caused the failures, but recently I've been able to identify a bit more as to what's probably happening. Maybe the issue could be sorted out with some help and hence the post.

After fixing the issue as in my previous post. outlined here:

the board has been functioning and has been running quite well, even with motor being braked physically. It looked quite pretty.

Some days back

DRV8305 latest failure situation - Situation log
---------------------------------------
* Motor got stuck due to a mechanical fault, while running.

* SMPS tripped and shut down likely due to OCP

* Smell of cashews being roasted.

* Switched off Power

* Switched ON after a few minutes, SMPS powered ON. Motor does not run.

* No 3.3V LDO output on the DRV8305 - have a Green LED with 330 ohms connected to the LDO output. Likely draws about 10mA. The LED is not lit.


* Checking and looking deeper,
 - no visible burns/cracks:
 - Initial checks showed L1 (a 0.47Ohms resistor is connected in that position) went open

 - Looking deeper, C21, C22 (47nF) capacitors are shorted internally

 - Looking further, R5 100ohms resistor is open

 - C4 appears to be shorted internally.

 - MOSFET's appear okay, checking with a meter.

* Removed C21, C22 (47nF) capacitors
 - C21 is really shorted internally

 - C22 appears okay, checked with a LCR meter, shows 47nF

 - Checking impedance between DRV8305 Pins 43 & 42, it appears they are shorted internally.

 - Checking impedance between DRV8305 Pins 39 & 40, it appears they are shorted internally.

 - Removed C4 (2.2uF) capacitor, it appears okay, LCR meter shows 2.2uF

 - Checking impedance between DRV8305 Pins 38 & 41, it appears they are shorted internally.


So, it appears that the DRV8305 is dead too, without diving any further deep.

What could cause the charge pump capacitors to fail thus. This has been the standard way the failures has been happening each and every time. Once the bootstrap capacitor fails, likely the DRV8305 also fails. Thus the resistor too. This one problem is holding me back from proceeding on this project, for a while. Sigh!

I wonder what could be causing this issue ? Anything that could be changed in the design to avoid this issue over and over again ? (I have tried looking into each and everything that I could read about it, but cant seem to find what I am missing)

HELP! HELP! Can someone please help ?

Thanks,

Manu

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DRV8662: Operating Conditions

August 5, 2019, 1:07 am
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Part Number: DRV8662

Hello,

Customers are considering driving a piezo actuator with the DRV8662.
The conditions are: frequency 500 Hz, voltage 93 V to 105 V, Piezo capacity 0.18 uF.
The customer confirmed the contents of 7.3 Recommended Operating Conditions in page 4 of the link data sheet of the following URL.
According to it, with VBST = 105 V, Frequency = 500 Hz and MAX 50 nF, so should I consider it as NG?

www.ti.com/.../drv8662.pdf

Best regards,
DDdoor

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