RE: DRV8701: Vref Adjustment based on motor size
Hi Mat, Is it possible a capacitor is placed across the motor windings? This can cause problems with current regulation.
View ArticleRE: DRV8881: PWM off time
Hi Umberto, In most use cases, the outputs can be set to a logic high or low and allow the DRV8881 to regulate the outputs. If an application is trying to PWM the inputs at high frequencies, the...
View ArticleDRV8881: PWM off time
Part Number: DRV8881Hi, I do not understand clearly the specification of PWM offtime in the datasheet and specifically the logic low/logic high numbers that are typically 20usec/30usec.How can they be...
View ArticleRE: DRV8842: DRV8842 about the OCP issues
Hi Mickey, Q1: The OCP value is 6A. This value cannot be changed. Is my understanding correct? Yes, the OCP value cannot be changed. Q2: What is ICHOP? Is ICHOP the output current for DRV8842? ICHOP is...
View ArticleDRV8842: DRV8842 about the OCP issues
Part Number: DRV8842Hi Team,The customer is using DRV8842. When OCP occurs, the nFAULT outputs a low level. The customer would like to use this low level signal as a detectionsignal in his design when...
View ArticleRE: DRV8871: Is there any equivalent IC but for higher currend needs?
Addendum: here is the motor we're using. www.pololu.com/.../3204
View ArticleRE: DRV10983EVM: Motor velocity constant
Hi Anders, Sorry for delayed response. Comment about BEMF constant calculation :DRV10983 has built in BEMF observer and it estimates BEMF internally. It calculates BEMF constant by integrating...
View ArticleRE: DRV10983: Speed control between Analog input and PWM
Hi Matsumoto-san, Question 1: 511 corresponds to 100 % input duty cycle. Motor will be able to run at maximum speed when speed command is 511. 511 is just digital representation of input duty cycle....
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RE: DRV 10983 EVM
Jung Chun Sik,To store parameters in excel press save on GUIRegards,Krushal
View ArticleDRV 10983 EVM
This is for Mr. Milan Rajane.I have used the EVM and am not able to write on to EEPROM. Upon clicking of eeWrite message displayed is " make sure power supply is higher than 22V" even though it is...
View ArticleRE: DRV8701: DRV8701 Operation out of Spec Voltage
Mat, I would use relays as last resort as they are not very reliable. Rather, I would look into 200V Power Mosfets or IGBT with their respective drivers (IPMs). Thank you.
View ArticleRE: DRV8871: Is there any equivalent IC but for higher currend needs?
Hi Nathan, If such a high current is not required, the DRV8871 can limit the current using ILIM pin. Section 7.3.3 in the datasheet talks about current regulation. I hope this helps, thank you.
View ArticleDRV8871: Is there any equivalent IC but for higher currend needs?
Part Number: DRV8871Hello there! I'm currently working on a battle robot's motors control and I was thinking of using the DRV8871. But, since the motor we chose for the robot (a beetleweight, 1.36kg)...
View ArticleRE: DRV10983EVM: Motor velocity constant
Hi Krushal! Thanks for your reply. In the section motor parameters Phase to Phase Kt found in DRV10983 EVM GUI. My understanding then is that this figure then should come from the motor spec or or by...
View ArticleDRV10983EVM: Motor velocity constant
Part Number: DRV10983EVMDear whomever it concerns!From the display tab I can monitor the motor velocity constant.When running at no-load the constant is almost constant across the possible speed...
View ArticleRE: DRV10983: Speed control between Analog input and PWM
Krushal sanThank you very much for your prompt reply!We would like to confirm one point about Question2.We guess that speed(rpm)'s formula is as follows;-speed (rpm) = motor speed (Hz) × 120/poleMotor...
View ArticleRE: DRV10983: Speed control between Analog input and PWM
Hi Matsumoto-san, There is correlation between Motor Speed (0x11 and 0x12 )and Speed Ctrl (0x00) Motor speed is output register, it indicates the actual speed of motor. It is 16 bit register and...
View ArticleDRV10983: Speed control between Analog input and PWM
Part Number: DRV10983Hi allWould you mind if we ask DRV10983?<Question1>On the I2C speed control, Maximum Velocity is 51Hz.-MotorSpeed1 = 0x01;-MotorSpeed2 = 0xFF;-Velocity = 512 (0x01FF) / 10 =...
View ArticleRE: drv110
Thank you James, for the information missing from the datasheet. But, as of 17 March 2017, the datasheet available from TI is Rev E, updated Nov 2916. This datasheet is still incomplete/wrong; in...
View Articledrv110
Would like a live Engineer to contact me directly at 781-565-1370 to discuss the following observation:STATUS pin goes high even though I do not see a thermal issue or under-voltage condition on the...
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