RE: DRV8302 GVDD, AVDD, PVDD all output zero voltage
Hey Rick, Our intention is to run this 3 phase BLDC www3.towerhobbies.com/.../wti0001p to move a >100kg car. The power is provided by a Hydrogen Fuel Cell. We would be targeting a PWM frequency of...
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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 ArticleRE: DRV8302 GVDD, AVDD, PVDD all output zero voltage
Hey Rick,Are you about about the resistors R1-R6 in the schematic? I added them to avoid ringing.Currently when we apply an input PWM signal (10Khz) to INH_(A/B/C) or INL_(A/B/C) we don't get any...
View ArticleRE: DRV8302 GVDD, AVDD, PVDD all output zero voltage
Hi Mike,Sorry, I was not clear on my comment. R7, R8, and R9 are reducing the gate voltage of the low side FETs. This is not recommended as it increases the RDSon, lowering the overall efficiency of...
View ArticleRE: Importing PCB footprint files into SolidWorks
HI Rick,One last question about the board mounting holes: how did you figure out the holes were type "T04" from the file "ThruHolePlated.ncd"? There were lots of hole types (e.g. "T13") but I wanted to...
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RE: Importing PCB footprint files into SolidWorks
Hi Brad,The DrillDrawing.gbr helped identify the holes. To the right of the board is the legend. I knew there were 8 mounting holes, so it was easy to deduce the size and whether they were plated.From...
View ArticleRE: DRV8844 with sense resistor?
Hi Thorsten, We will investigate and reply soon. Can you provide a brief description of your application (motor, voltage, current, any other details)? Perhaps we have a better fit.
View ArticleRE: Importing PCB footprint files into SolidWorks
Hi Rick, OK, that's what I thought you might have done. It makes sense. I suppose the "Txy" notation does mean something, but for my purposes, correlating the number of holes to the hole type code in...
View ArticleImporting PCB footprint files into SolidWorks
I would like to import the PCB design files for the board used in the DRV8312-69M-C2-Kit into SolidWorks. Unfortunately, SolidWorks (and CircuitWorks) cannot import Gerber files. Could someone at Ti...
View ArticleRE: DRV8308 - recommended and safe values for charge pump capacitors
I spoke with our designer, and there would be some potential issues with changing the CP1/2 capacitor value, and that would require analysis. But as for the VCP to VM cap, that can be made bigger if...
View ArticleRE: DRV8835: Output Configuration with four independent Resistive Loads
Hi Rick, Thank you for the confirmation on our configuration. Our maximum VM Level is specified as 10.5 Vdc, so we will be within the DRV8835 spec. We will follow up the EVM - that is a good idea. Many...
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: DRV8844 with sense resistor?
Hi Thorsten, I realized you are probably looking for stepper control. The DRV8844 can be modified to control steppers using sense resistors. Pin 6 is the low side FET source for OUT1 and OUT2. Pin 9 is...
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RE: DRV8302 GVDD, AVDD, PVDD all output zero voltage
Hello Rick,Thanks for the help. We removed R7-R9 and it fixed a few things such as AVDD - now 6.6 VDVDD - now 3.3 VYes we are setting EN_GATE high and yes we see ~40mA current draw when we set EN_GATE...
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 ArticleRE: DRV8844 with sense resistor?
Dear Rick,thats good news. Thank you for your fast reply. Indeed this is a stepper motor application. In this case we are reworking an old design, switching from THT to SMD technology while keeping...
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 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...
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