Part Number:DRV8704
Hello.
I have an issue with DRV8704. I designed my PCB. I made all the connections as per suggested in the DRV8704 technical document
VM = 12.6V
FET = IRF1404 (40V, 202A)
Motor = Tamiya 540 with 75:1 gearbox
Current Without Load = 1.2A
Maximum Torque = 12kg・cm (6.32A/185rpm)
The problem is the starting speed and torque are too low, the motor is not working with its full power at starting, i mean its not moving sharply, its moving gently at starting, and just giving a little pressure makes it stop and transistor gets warmer. And sometimes OCP bit set '1' and fault LED gets 'ON'.
I think its because of my configurations of DRV8704. Here is my configurations and schematic
CTRL REGISTER: DTIME = 00, ISGAIN = 11, ENBL = 1
TORQUE Register: 0xFF
OFF register: TOFF = 0x00
BLANK register: TBLANK = 0x00
DECAY register: DECMOD = 000
DRIVE register: IDRIVEP = 0x10, IDRIVEN = 0x10, TDRIVEP = 0x00, TDRIVEN = 0x00, OCPDEG = 0x11, OCPTH = 0x11
I changed DRIVE bits, and it's still not working fine enough, Please help me on my configurations
Also its not working fine with parallel transistors, that motors couldn't move and OCP fault is detected, i don't know why? and now i'm using one H-Bridge.
What should i do? Help me please.
