DRV8844 "backward powered" problem
Hello. I need help about a strange problem I'm facing with the DRV8844.In some applications is possible that the controlled DC motor gets mechanically turned, while power is not supplied to the control...
View ArticleProduct selection: BLDC motor driver with and without Hall sensors
I have a prototype of a small BLDC motor, and I'm looking for a driver evaluation kit to get it up and running. The current will be less than 3A, the torque very low, probably less than 0.1 N m. I'm...
View ArticleRE: DRV8301-69M-Kit, issues with high duty cycles (PWM)
Oliver,Can you check the corresponding input signals and post here.It would be good to compare INHA, INLA, with OUTA to see what is happening.
View ArticleRE: DRV8301, working well at first, then go to fault: GVDD_UV
I have replace the DRV8301 twice. It work well( can output PWM signal under unload condition) first and then go to fault( GVDD_UV). I replace the VCC60 bulk capacitor to 10uf/100V on C69 and C41, and...
View ArticleRE: DRV8301, working well at first, then go to fault: GVDD_UV
The device in your original post with GVDD = 1.33V is probably damaged. If you have not changed it since then, please change it. Can you provide the layout also? Do you have any traces under the device...
View ArticleRE: DRV10975 tuning: current probe recommendation
Hi Gary, Our experts have been notified and should reply soon.
View ArticleRE: DRV10975 tuning: current probe recommendation
Hi Gary,100 kHz should be good enough for testing motor. Since motor current measured on phases will be in electrical Hz, 100 Khz should give you adequate data to tune motorRegards,Krushal
View ArticleRE: DRV10975 tuning: current probe recommendation
Thank you. I guess I'm not properly interpreting what I'm seeing. This is with a prototype motor that we are developing. I see a low frequency wave form (about 2 Hz roughly; the motor is turning at...
View ArticleDRV10975 tuning: current probe recommendation
The Tuning Guide seems to rely heavily on current measurements. Am I correct in assuming that I really should have a current probe?I bought one for this purpose, but evidently the bandwidth is not...
View ArticleRE: DRV8711 and TMS320F28377S Launchpad- Current Sense Query
Hi Janani, You cannot read current sense data through the SPI interface. You will need dedicated circuitry. To connect a separate current sense circuit, you should connect across the sense resistor...
View ArticleDRV8711 and TMS320F28377S Launchpad- Current Sense Query
Hi,I'm a beginner. I would like to know how current sense can be achieved using DRV8711.It has an internal circuitry that does current sense.Will I be able to read the current sense data through SPI...
View ArticleRE: DRV8850 PWM micro pin count
Thanks Rick, in this case I cannot do that. But it was a great idea :-)If I am driving the 4 lines with PWM signals, does the device itself take care of deadtime? Is there an advantage to controlling...
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RE: DRV8301, working well at first, then go to fault: GVDD_UV
I have changed it with a new one. But the problems still exist." GVDD should be approximately 11V". Is this status exist on the default situation without DSP config? The following is my pcb. The left...
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RE: DRV8301-69M-Kit, issues with high duty cycles (PWM)
Hi Nick,Please find the requested signals in the measurement below.So to me it seems like the requested duty cycle of 99.7% can be adjusted for three cycles before the error occurs. Here is the first...
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RE: drv8308 lock abnormal
Hi Phil, I've tried changed the SPDREVS and other parameters but didn't work. I found some other interesting thing.I test the EVM with Fclkin=200HzThe first picture shows with SPEED=1000, LOOPGAIN=300,...
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drv8308 lock abnormal
I did an experiment with the DRV8308 EVM and I used the clock frequency mode. The clock frequency is set as 100Hz and the commutation is 180degree sine.But the LOCKn signal becomes active(low shown as...
View ArticleRE: DRV8301EVM question
Hi Zhao,I am not sure I understand the question. Please refer to section 7.2 Functional Block Diagram of the datasheet.SH_A is used for multiple purposes:1) It is the low side of the high side gate...
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DRV8301EVM question
Team,I got a request from a customer (email address 1294039604@qq.com) regarding DRV8301EVM: the customer wants to understand the function of SH_A, SL_A, GL_A, SENSE_N1, SENSE_P1. I have copied the...
View ArticleRE: DRV8850 PWM micro pin count
Hi Ian, The device does manage deadtime when switching. The combination of a minimum deadtime plus the slew rate resistor allows adjustment of deadtime. In general, there is no advantage to controlling...
View ArticleDRV8850 PWM micro pin count
Hello,I am looking at designing in 2x DRV8850 into a product to replace an Allegro A3906. I need more current drive and the inbuilt LDO would be good too. The A3906 has 2 inputs (IN1, IN2) to control...
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