RE: General getting-started BLDC driving/control questions
all your questions are going to depend on the gear reduction you use and how many poles you have in your motor. good luck!
View ArticleRE: DRV8870 / IVM, IVM(sleep) at VM=16V
Asaka-san, sorry for the delay. Since Figure 3 shows a 7% change between 12V and 16V, the max IVM values should also be 7% larger. active: 10.7mA sleep: 10.7uA Best regards, RE
View ArticleDRV8870 / IVM, IVM(sleep) at VM=16V
Hello, Could you please let me know the IVM, IVM(sleep) value at VM=16V?Best Regards,Ryuji Asaka
View ArticleRE: DRV8308 Bad Commutation in SINE mode
Paul, good question. The duty cycle the DRV8308 applies during startup is not well-controlled. The SPEED register does affect it, but really just needs to be a large enough value to spin the motor up...
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DRV8308 Bad Commutation in SINE mode
The DRV8308 register setup I am using is shown below.The mode is 120 deg commutatioin with single Hall (BASIC = 0, ENSINE=0)This runs the motor perfectly over a wide speed range. LOCKn active after...
View ArticleRE: BOOSTXL-DRV8301 output oscillation
Nicholas, I sent Tom the design files for the DRV8301-HC-C2-Kit, as he was asking the question about the oscillation as a means to an end to designing a board using the DRV8301. I think that having the...
View ArticleBOOSTXL-DRV8301 output oscillation
Hi motor drivers team,My customer is experiencing buck supply output oscillation above 38V input voltage. Information I have received so far:140mVpp oscillation experienced with original 47uF output...
View ArticleRE: DRV8412 lowest frequency possible and corresponding bootstrap cap size?
Hi Andrew, We will investigate and get back to you. When running at 100Hz, what is your maximum duty cycle? Do you need 100Hz, or can you run at ~800Hz with a 50ns low side pulse to avoid UVP as...
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 ArticleRE: DRV3201-Q1 Maximum value of tdeg,ENon ( A-56)
Hi Ushikubo-san, Sorry for the delay, this question is taking longer than we had expected. I will provide a status update by the end of the week. Regards, Will Toth
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DRV3201-Q1 Maximum value of tdeg,ENon ( A-56)
Hello, tdeg,ENon doesn’t have maximum value.Please give me any information of maximum value of tdeg,ENon. Best Regards.
View ArticleRE: DRV8308 - recommended and safe values for charge pump capacitors
Hi, We will investigate and reply soon.
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 ArticleRE: DRV8305 minimum pin configuration
Hi Asif,PWRGD is an open drain output indicating VREG undervoltage or watchdog fault. You can chose to use this or not.WAKE is a pin used to bring the device out of SLEEP mode. If you do not expect to...
View ArticleRE: DRV8305 minimum pin configuration
Hi Asif, Yes, you can pull the WAKE input pin high using a resistor. Doing so disables sleep mode increases the current used by the DRV8305 from <100uA typ to 4mA typ. If you are trying to reduce...
View ArticleRE: BLDC Motor with current regulation
Hi Rick-san, Thank you for your reply. I'm sorry for my poor information. The voltage is from 12V to 24V. The constant current is 0.6A. I will ask the customer about control speed. He wants to reduce...
View ArticleRE: DRV8840 I0~I4 pin voltage level
Hi Shimizu,4.7k should be work without issue since the device is even fine with 3.3V input H level. But smaller resistor will be better to keep stable level in noise condition. Best regards,
View ArticleRE: DRV8302 GVDD, AVDD, PVDD all output zero voltage
Hi Mike, Can you provide more background on the application? What PWM frequency are you targeting? The Phase connections are unusual. The current limiting resistors in the gate drive may not allow the...
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...
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