Part Number: DRV8662
Hello guys,
One of my customers is considering using DRV8662 or DRV8601 for their next products.
They found two demo kits in the following URL.
http://www.ti.com/lit/ml/slyt539/slyt539.pdf
Are these demo kits available?
If it is not avalable, do you have any other demo kit for haptics driver?
Your reply would be much appreciated.
Best regards,
Kazuya Nakai.
Part Number: DRV8881
Hi all
Would you mind if we ask DRV8881P?
Customer uses Brushed DC motors with Para (parallel) feature.
I think that the output voltage slowly becomes 0V when braking the motor with slow Decay.
However, it will be -2.4V (according to customer measurement). This exceeds the maximum rating of -0.3V.
In addition, the voltage drops instantaneously to -2.4V.
The low side is on at the same time in parallel mode. Or is there a time difference between On and the low side of AOUT and BOUT?
Best Regards,
Ishiwata
Part Number: DRV8825
Hi Team,
We don't use nHOME(27pin), nENBL(21pin), nSLEEP(17pin), nRESET(16pin) pins
Therefore, we examine the following setting.
- nSLEEP(17pin), nRESET(16pin) are pulled up to 3.3V or 5.0V directly
-nENBL(21pin) is OPEN (No connected).
-nHOME(27pin) is pulled up to 3.3V or 5.0V by 100kohm
Could you please let us know if you have any concern?
Regards,
Hide
Part Number: DRV8825
Hi Team,
We don't use V3P3OUT (3.3V) for VREF and other circuit.
Because, our load current is more than 1mA.
Therefore, we use the external 3.3V or 5.0V(without VREF) by LDO or DCDC.
Then, is there a recommended power supply sequence?
(For example, 3.3V or 5.0V must be less than VM voltage etc.)
According to the Absolute Maximum Ratings of Digital pin voltage and V(xREF) input voltage is 7V(max) and 4V(max).
So, I understand that there isn't the limit for Power supply sequence.
Is my understanding correct?
Regards,
Hide
Part Number: DRV8702-Q1
Hello,
My customer is working on the design with DRV8702 and CSD88539. My customer has a problem regarding SHx pin overshoot and gate voltage fluctuation. Could you please do design review for him? I have schematic, layout, and scopeshot. Once you respond, I would send you the data offline.
Regards,
Itoh
Hello,
We recently designed a motor driver board using the DRV8353RH driver chip. Referring to the driver application circuit of the development board, we encountered problems during the test. The problem is that when the motor speed is increased or it is operated at a certain speed for a while, The motor stops rotating and the test FAULT pin is also pulled low. The chip is a hardware configuration interface, we can not know the specific cause of the failure. Is there any way to know the cause of the problem? How to solve this problem. Looking forward to your reply
Part Number: DRV120
What would be the maximum output (solenoid) current for this device. I am anticipating my application will require .250-.300A, for peek, with significantly less for hold.
Thanks!
Hank Z.
Part Number: DRV2605
Hi!
One of the most common questions when using haptics drivers is related to the different modes and configurations that our devices support. In general, all our haptics drivers solutions support open and closed loop modes. Depending of the actuator load and the end application, the user must select one or another. Here there are some considerations and advantages when using closed or open loop.
In some of the haptics devices, it is also named as smart-loop due to the advanced algorithms and configurations that involve the closed-loop system. A closed-loop mode consists in a device configuration based on the connected actuator. The internal algorithm optimizes the device parameters for a resonance tracking (in case of an LRA load), automatic level calibration, overdrive and braking levels, diagnostics routines, etc.
This closed loop mode is normally suggested for LRA loads. It is important to remember that the LRA requires of a resonance frequency to work. This frequency allows to reach the optimal value. Any variation of around 5Hz from the resonance frequency will cause a rapid drop in vibration performance. The smart-loop architecture allows to maintain the optimal frequency value even if there are tolerance values in the LRA specifications.
In both, the LRA and ERM loads, the overdrive and breaking algorithms allow to have the best actuator performance. The closed-loop feedback determines how high or how low must be the output voltage to accelerate or decelerate the actuator.
Contrary to the closed-loop system, the open-loop mode doesn't have a direct feedback from the driver output. This mode is not useful for cases where the user requires of a diagnostic or an automatic calibration of the output level based on the actuator characteristics. However, there are some cases where the user does't require to perform an automatic calibration (which usually takes some seconds) in the application. So, the user may define the device parameters (rated voltage, brake and overdrive time, LRA period, etc) based on the experience and testing of many LRA and ERM loads.
When the auto-calibration is not required in production, the fixed settings procedure is suggested to perform with an open-loop mode. This procedure is applied before the manufacturing stage. It consists in taking many LRA or ERM loads and configure them with auto-calibration. After a minimum of 10 units tested, the user can take an average value and fix it for production purposes. In that way, the application/product won't expend some time to calibrate the actuator when it is powered on.
Here there are some examples of registers configuration for closed and open loop modes.
DRV2605L LRA mode. Closed loop. Auto-calibration:
(Please visit the site to view this file)
DRV2605L ERM mode. Closed loop. Auto-calibration:
(Please visit the site to view this file)
DRV2605L ERM mode. Open loop. Library Effect:
(Please visit the site to view this file)
Part Number: DRV10983
Dear People,
We are controlling DRV10985 either by the analog input pin or I2C programing and we found a non continuity point (Abnormal points) at some control values, producing an inestable working point in our servo system.
In our case between 890Hz and 950Hz there is a control gap, no intermediate values can be regulated.
Is there any solution to obtain a continuos regulation?
Thanks in advance.
James Palou
Part Number: DRV8704
Hi,
I m planning to use DRV8704 for one of my projects. I m curious to know how DRV handles PWM input. Will it produce complementary signal on the output for a specific half bridge to handle or is it mirored pwm signal for one high side FET and one low side FET?. If i send one edge aligned PWM signal on AIN1 with 30% duty cycle what will be the output on A1HS, A1LS, A2HS and A2LS?
Part Number: DRV8844
Hello,
I'm planning to use DRV8844 to drive 2 solenoid valves, and I just want to check if one terminal of valves can connect to the output (OUT) and the other terminal connect to GND.
Thanks,
Nhi
Part Number: DRV8876
Hello,
I read in SLVAE59 which DRV8876 can be used to drive low current solenoid valve:
3.3 DRV8876 For lower current applications the DRV8876 is an integrated H-Bridge driver that can also be configured to drive two solenoids in Independent Half Bridge mode.
The datasheet of DRV8876 defines as 3.5A the maximum peak current, but to me is difficult to determinate how is the maximum current it can drive to control a solenoid valve.
I'd like to drive a Solenoid valve: Nominal Voltage of 12V; Rated Power of 27W; Current of 2.25A;
And I'd like to know if can I use DRV8876 to drive it, or is strictly recommended to use DRV8842 instead that.
Thanks for help.
Regards
Leandro Schmitz
Part Number: DRV8873-Q1
Can Someone guide to compute the maximum current consumption of DRV8873-Q1 hardware version?
This is basically to identify the required input power supply rating.
Part Number: DRV8343-Q1
I got a question from customer about Gate drive voltage.
Below figure shows one portion of EC list.
In case of VVM=13V, IVCP = 0 to 25 mA, GHx no output load
8.4V(min) 11V(Typ) 12.5V(max)
It doesn't look normal distribution.
(The typical value doesn't mean the center of distribution)
Does this device has clipping function not to go over 12.5V?
Otherwise, it means simply temperature characteristic? just like 8.4V(Hot) 11V(Room) 12.5V(Cold)
We just want to know the median value at room temp.
Regards,
Tosh+
Part Number: DRV8320
I am trying to use IC in UAV application. where Power supply can provide transient of 28 to 48 V in 1ms according to MIL-STD-704D. As DRV8320 is directly on power line my doubt is whether This TI IS can withstand on some transient voltage as its range is 6 to 60V. IF not what is the possible protection or solution?
Part Number: DRV8823
Hi,
in my application my pwm frequencies can't driver at higher frequencies than 500HZ and so the usual H-bridges make a high-pitched sound. Therefore I'm looking for a solution not to control the motor driver with pwm by the µC but via commands.
Can I use the DRV8823 to control a DC motor in speed 0-100% via commands instead of pwm?
Part Number: DRV8323
Hey Guys - what should i do with the CAL input pin if i use the SPI version of this chip? Leave unconnected or tie low? If i tie low, will i be able to use the CAL function from the SPI register?
Thanks!
Brett
Part Number: DRV8323
Hey Guys - is there a downside to using 3x PWM mode when setting up FOC motor control? My thinking is the dead band control in the DRV8323 eliminates the need for 6x PWM. I ask because the reference designs (at least the ones i've looked at) always use 6x PWM mode. Is seems like 3x would be better (less traces between MCU and DRV if nothing else) if get same performance.
Thanks!
Brett
Part Number: DRV8350
Hi all
Would you mind if we ask DRV8350?
On the DRV8870's datasheet, there is the description "The voltages applied to the inputs should have at least 800 ns of pulse width to ensure detection."
So, does DRV8350 have the same restriction for input?
If it has the same restriction, how much is it? 800ns?
As the background of this question, we would like to know the usable duty cycle range which depends on PWM frequency.
Kind regards,
Hirotaka Matsumoto
