In order to reduce radiation emission and NOT exceed the ABSMAX current limit of the DOUT of the AMC1305. We are suggested adding an RC on the data lines. Engineer suggested to put a series resistance of the 400 Ohm and Cap on the data line. However, when R4=399 Ohm and C4=100pF are used, the motor is abnormal and can't startup. And it's ok with R4=0 and C4=100pF. We need your great help to clarify it asap.
R4= 0 Ohm, C4=100pF => Ok
R4=399 Ohm, C4=100pF => N.G
Please see previous suggestions as enclosure.
AMC1305 Simulation for DOUT capacitive load R2.pdf
Customer: WW class
application: Server motor
Watts:4KW-5KW
