RE: DRV8701: 36V 300A motor controller design
Hi Daniel, The device can be operated at 36V. Care must be taken to avoid voltages that could damage the device. When stopping the motor, the voltage spikes could exceed the maximum ratings. Circuitry...
View ArticleRE: DRV8412: The output is absent
Hi Serafino, You should have seen the waveform if you zoomed in to a 10us/div. The 100nF bootstrap capacitor is intended to be used at frequencies higher than 10kHz. If you planning to run a lower PWM...
View ArticleRE: DRV8833: Regenerative braking
Hi Ben, The device does this automatically when limiting the current in fast decay. Please refer to Figure 6 of the datasheet. Coast mode (sometimes referred to as asynchronous fast decay) can also...
View ArticleRE: DRV8711: Predriver Fault(XPDF) condtion
Hi Matsumoto-san, The predriver fault (xPDF) indicates a failure on the gate of the FET. The predriver fault may not catch a short between xOUT1/xOUT2 and GND. The OCP fault (xOCP) indicates a failure...
View ArticleRE: DRV8841: Possible to control speed of DC through current regulation feature?
Hi Kevin,I don't think the DRV8841 will work very well for a speed control application. The current regulation feature will control your torque rather than your speed. Depending on the torque...
View ArticleRE: DRV8302: Wrong voltage output at GH_B pin
Hi Rishav, Are you operating in 6-PWM or 3-PWM mode? What are voltages at the other inputs when you measured 24 and 10.8V? Do you have FETs connected? Have you checked that the FETs are operating...
View ArticleRE: DRV8302: Wrong voltage output at GH_B pin
I am operating in 6-PWM mode. I am putting 5v at INH_B when it gives 24V at GH_B. When I give 5V at INH_A and INH_C (separately), I get 31V at GH_A and GH_C resectively. I don't have FETs connected. I...
View ArticleClik here to view.
DRV8302: Wrong voltage output at GH_B pin
Part Number: DRV8302I am working wiht the following simple schematic:I am using PVDD at 24V. When I apply 5V to channels A and C, the voltage output at GH_A and GH_C give the correct voltage output...
View ArticleRE: DRV8832: Need to detect stall condition
Hi James,Can you suggest a current-sense circuit for stall detect to be used with DRV8837C ? Will Op-amp ckt in page 26 (Figure 16) of the DRV8312 datasheet work for me?Also if i have to add a series...
View ArticleRE: DRV8840: PWM input to output timing
Rick,Looks like my text got removed from the previous post. The top plot is pin 7 of a passing board the bottom plot show the same pin once the DRV8840 was replaced with a different lot code. The motor...
View ArticleRE: Stepper Motor Driver DRV8835 Voltage Problem
Hi RickIf you know of any application note to use this DRV8835 as stepper motor driver please let me knowJohn
View ArticleRE: Stepper Motor Driver DRV8835 Voltage Problem
Hi John, I am not aware of an application note. There is a DRV8835EVM available through the TI store to allow experimentation.
View ArticleRE: DRV11873: Cut-out at certain duty cycles - why?
Brian- I've confirmed that I am receiving false rotor lock occurrences, but unfortunately dithering by 1% around this duty cycle (at a 1s interval) does not solve the problem, nor does 2%, and at 2%,...
View ArticleRE: DRV8832: Need to detect stall condition
Sundar,I think the circuit in the DRV8312 datasheet will not be the best solution for the reason you mentioned. Check out TI's integrated current sense amplifier portfolio or post to our Amplifiers...
View ArticleRE: Stepper Motor Driver DRV8835 Voltage Problem
Hi Rick Thanks for the EVM link. We are waiting for another board. If that did not work, we will get the eval board. John
View ArticleRE: Stepper Motor Driver DRV8835 Voltage Problem
Hi Rick, Thanks for the details for the stepper motor. This is helpful.
View ArticleRE: DRV10983: USB2ANY purchasing
David,TI doesn't sell USB2ANY standalone. It's probably easiest to just order a DRV10983 EVM which comes with a USB2ANY. The EVMs can be ordered here: http://www.ti.com/tool/drv10983evmIs your customer...
View ArticleRE: DRV8840: PWM input to output timing
Hi Mike, Let me look into this. I hope to have a response by Wednesday of next week.
View ArticleRE: DRV8711: Predriver Fault(XPDF) condtion
Rick sanThank you for your reply.The predriver fault (xPDF) indicates a failure on the gate of the FET. The predriver fault may not catch a short between xOUT1/xOUT2 and GND. The OCP fault (xOCP)...
View ArticleClik here to view.
RE: DRV8302: Brushless Sensorless Motor speed oscillates, which causes it to...
100% sure its not the interrupts. The problem is with the way I use the zero cross time to predict when to commutate.Reset timer T on commutationLook for zero cross time TcrossPredict next commutation...
View Article