RE: Need +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid...
Michel,To estimate the pumped liquid, do you have any other controller in your system ?If you have , that controller can read FG for speed and control the PWM input to change the speed and the...
View ArticleRE: Need +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid...
Jasraj, We do have another controller supervising the values of this motor driver. This should provide proper speed regulation. However the instruction talks about open and close loop operation. I...
View ArticleRE: Need +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid...
Michel, Sensor less BLDC motor drive works with estimating rotor position because hall sensor feedback is not present. The term open and close loop is defined in that context here. While starting since...
View ArticleNeed +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid pump.
Hi,I need +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid pump. We are pumping a liquid with variable viscosity and we need to estimate the pumped liquid volume using the motor...
View ArticleRE: Importing PCB footprint files into SolidWorks
Hi Rick - OK, that's what I thought, but thank you for confirming. I followed your workflow and was able to verify the through hole locations using the workflow steps you outlined. I think I now have...
View ArticleRE: General getting-started BLDC driving/control questions
Rick,Thanks for the quick response. In the anticipated application, it's typical to have a 3 cell LiPo battery, so 11-12vdc is available. The BLDC motor I'm currently using as a prototype is about 1"...
View ArticleRE: General getting-started BLDC driving/control questions
Chris, Thanks for the detailed reply. Responding by group:• Sensorless for RPM, accel/decel: Got it.• Hold, count steps, single step with Hall sensors and encoder: I'm hoping that all of this can be...
View ArticleGeneral getting-started BLDC driving/control questions
Folks,I'm interested in developing a motor controller/driver for a range of small BLDC motors (5-12v, <1amp) generally with a gear train (100-250x), to be used in small mobile robotic devices for...
View ArticleRE: DRV8835: Overcurrent Period Specification
Hi Colin, Yes. If the real OCP condition > tDEG (1us), the device is in OCP protection and turns off the output for 1ms (tOCP) and retrys the outputs. Then if the OCP event is still there, the...
View ArticleRE: DRV8835: Overcurrent Period Specification
Hi Wilson, Many thanks for the prompt confirmation of the overcurrent behavior of the DRV8835! Best regards, Colin Campbell
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DRV8835: Overcurrent Period Specification
Hi TI,The DRV8835 Data Sheet (see segment of page 5 below) defines an Output Overcurrent Deglitch period (Tdeg) of 1us, but is silent on the actual Overcurrent Period (e.g. 100us) prior to the MOSFET...
View ArticleRE: DRV8835: Output Configuration with four independent Resistive Loads
Hi Colin, The configuration described should work, although you may not get the same amount of current out of the system. The reason is that the high side RDSon is usually a higher than the low side....
View ArticleRE: DRV8835: Output Configuration with four independent Resistive Loads
Hi Rick, Thanks for the quick follow up, and feedback on the MOSFET Rdson. For one application, we will be running a VM supply of 5 Vdc with a nominal 20 mA resistive load (250R); our second...
View ArticleDRV8835: Output Configuration with four independent Resistive Loads
Hi TI,I'm planning to use the DVR8835 to drive an output configuration consisting of four independent resistive loads, each connected from a single Output pin to the common Ground reference (GND)....
View ArticleRE: Need +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid...
Jasraj,In this case, I assume it is normal for motor to slow down under load? Is it possible to establish a load-speed relationship?Is it possible to know the power, torque or current injected into the...
View ArticleRE: DRV8412
Hi Eli,Yes, the decoupling can be reduced. An example is the DRV8412EVM (figure 20 in the datasheet) and DRV8432EVM (LINK to zip files)Both use a single 47uF instead of a 330uF.We will investigate the...
View ArticleDRV8412
In datasheet of DR8412 Application diagram. Recommended decoupling capacitor for GVDD 300uF. Can we reduce a value of it without reducing performance of the driver?
View ArticleBLDC Motor with current regulation
Hello,Our customer looks for BLDC motor driver IC.His application is below.1) Take up a tape from reel with constant speed2) When it finished, strain a tape with constant currentDo you have any driver...
View ArticleDRV8870 Tharmal resistance
HelloI have a question about thermal resistance of DRV8870DDA.Please tell me board information of 6.4 thermal infomation in datasheet.We would like to use it under the following conditions.- Ta=60℃-...
View ArticleRE: Need +/- 2.5% speed regulation with DRV10983 on a fractional motor liquid...
Michel,Motor will definitely slow down under load. By how much, largely depends on the complete system and load (including inertia, electrical power input, motor efficiency etc). You can establish this...
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