DRV8840 I0~I4 pin voltage level
HiMy customer is using DRV8840. He has a question about I0~I4 pin voltage level.Please see the attached file. Customer noticed abnormal voltage level of I0 and I4 pin.I0 pin is pulled up 5V through...
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 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 ArticleClik here to view.
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 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 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 ArticleDRV8412 lowest frequency possible and corresponding bootstrap cap size?
We are using DRV8412 up to 10kHz. Some applications are less than 100 Hz. At 100 Hz what should the bootstrap cap be? Is there a design equation? The 5 ohm resistor on GVDD is already know, but for...
View ArticleDRV8308 - recommended and safe values for charge pump capacitors
Hello!Assuming that 0.1uF/35V is a recommended capacitor for pins CP1 and CP2 (CP flying capacitor) on DRV8308, what would be the maximum tolerable capacitance? Or in other words, would the IC remain...
View ArticleDRV8305 minimum pin configuration
Hello -I am building custom hardware, and have a question regarding the DRV8305. On the BOOSTXL-DRV8305, the "PWRGD" and "WAKE" pins are broken out. On the TIDA-00643 reference design, I see that the...
View ArticleClik here to view.
DRV8302 GVDD, AVDD, PVDD all output zero voltage
I am building a brushless motor controller for a motor rated at 60V and 80A using DRV8302 to drive the MOSFETs. We are are having some issues with the PVDD, GVDD and AVDD outputs on the DRV8302. We...
View ArticleDRV8844 with sense resistor?
I'm looking for a replacement for the good old L298. DRV8844 seems what I'm looking for, but I'm not sure if I can add sense resistors for external current regulation to the device? The functional...
View ArticleDRV8701 current chopping
Hello,I recently developed a brushed DC servo drive using the DRV8701 IC, and I was wondering if it is a good idea to feed the VREF pin with a low pass filtered PWM signal from my microntroller, to be...
View ArticleDRV8305 Damage
Hi everyone..I'm using TMS320F28035 with DRV8305 motor driver. My custom board two layers. Top layer control unit. Bottom layer power unit and there are 6 mosfets (SUM110N06-3M9H-E3). I'm using...
View ArticleDRV8803 PWM duty cycle floating point handling relate issue
Hi I have query on PWM signal input to DRV8803. Did the IC handle floating point Duty cycle input. I theink it is not working . I got same values for 50.1 to 50.9 and sudden variation for 51. How can i...
View ArticleSolution to emulate incremental encoder
Hello,To get a brushless motor position, we can have 2 solutions:- Use a Resolver- Use incremental encoder.I'm using the Delfineo F28377D on the evaluation board (IDDK377DKit)Sometime we will need to...
View ArticleClik here to view.
DRV8301 Buck Converter issue DRV8301-HC-EVM
Hey Guys,i have some problems with my Motor-Kit.The gate drive(DRV8301) was burned up and i soldered a new one on it.Now it seems that the buck converter didn't work. I've measured some voltage and...
View ArticleDRV8833CEVM - Can I use it to test/evaluate DRV8833?
Hello,A customer wants to test the DRV8833 using a DRV8833CEVM. I believe the parts (DRV8833 and DRV8833C) are pin compatible but are there any other considerations? Thanks.
View ArticleCurrent Measurement with DRV8303
Hello,Using the DRV8303, we are trying to measure the current across a low-side shunt at 1 mOhm. The connection is the same as RS1 on page 21. We have the REF pin at 3.3 Volts. In all cases I am...
View Article