Hi,
I am using Drv8711Evm board. I've made my own with similar schematic design of this board. No problem with Evm board. Everything works fine.
But my board gives me "Channel B overcurrent shutdown" fault when i tried to run board. these are my steps:
1- 28V to supply Drv8711 and FETs.
2- FETs and Resistor side are the same as Drv8711Evm Board.
3- 5V for digital voltage.
4- Sleep 0 to 1 (gets out from sleep mode. I see current changes and SPI answers)
5- Send Enable Motor (Control Register -> Enable, Gain = 40, DeadTime = 850ns)
(OCP Threshold = 1000mV, OCP Deglitch 8uS)
6- Drv8711 returns immediately fault condition. When i read STATUS register i see 0x04 means :"Channel B overcurrent shutdown". When i tried to clear it overwritng related bit with 0 no effect on this bit. Still gives me this fault.
7- Reset clears everything. if i try same procedure it gives me the same fault.
I dont have a chance to look board now. I can look at on monday. But i wonder this, it can be a short circuit problem on mosfet Drain-Source on channel B? What kind of a problem can trigger this? especially it says channel B. So may i focus on FETs on this channel?
