Part Number:DRV8301
Hello!
I'm using a DRV8301 driver. I'm familliar with InstaSPIN, and I tried to do something familliar and more robust myself. I used transistors (IRFP4310ZPBF) instead of InstaSPINs SUM110N6. I've increased bootstrap capacitors value from 100nF to 220nF and even up to 2.2uF, yet I still have a problem with PWM signals. The pictures are availible on the followig links:
[url=http://shrani.si/?1J/UG/29Pg48BH/tek00001.png][img]shrani.si/.../
Yellow signal is GH_X and blue is GL_X.
Cap value between CP1 and CP2 (pins 14 and 15) in 22nF, DTC pulltodwn is 1R, RT_CLK is 205k. Buck converter outputs nice 5V supply, also there is no problem with 3.3V regulator. The PWM signals were measured after using TMDSCNCD28069MISO Texsas ControlCARD and pressing "Identify Motor". Supply voltage is cca 50V and current draw is cca 120mA. I tried the same with original InstaSPIN FOC evaluation board using same parameters (20 Hz Estimation frequency, motor pole pairs:7). The signals were smooth and motor got identified corectly with no problems.
With my prototype (i'm using it EXCLUSIVELY for my own purposes and learning!!!!) i get signals as seen above. So the only real thing that got changed are the transistors.
I've measured the required PVDD and DVDD and other required pins...the voltages are the same as on the original evaluation board.....so the question is, what am I missing? Plus, with InstaSPIN the motor has no prolems running, with my board it makes strange high pitch soungs and rotates barely.
If someone has any idea what could be wrong please let me know, I can measure something and come back to you with additional information. Thank you in advance!!
