Tool/software:
Hello,
Can you help us understand how to calculate the base current on the MCF8329A?
The data sheet isn't very clear.
- current sense resistor 0f 0.5mΩ
- current sense gain of 20V/V
- expect an RMS current of ~25A
Thank you, Keith
Tool/software:
Hello,
Can you help us understand how to calculate the base current on the MCF8329A?
The data sheet isn't very clear.
Thank you, Keith
Hi Keith,
When calculating base current we recommend changing either your RSENSE and/or CSA_GAIN so the solution of the equation 1.5 / (RSENSE * CSA_GAIN) to be slightly over the rated max peak current of the motor. in the case of this motor I do not know the max rated peak current, but assuming 60A is close, you would set CSA_GAIN to 5 V/V so that 1.5 / (0.005 * 5) = 60A.
When the CSA_GAIN and RSENSE are finalized a scaling factor has to be applied to the value found before so 60 * (32768/1200). Then convert this value into hex and put the hex value into the BASE_CURRENT bit field.
We have a getting stated video which maybe helpful for setting up the MCF8329A for the first time which can be downloaded using the link below:
Link: https://tidrive.ext.ti.com/u/jhUObDqVDkKcFQ56/03ca804d-4764-47b7-93ef-dd46c5ac18d7?l
Access Code: fXJM6S!4
I will also link here an early version of the MCF8329A Tuning Guide, but this guide is still subject to change: https://tidrive.ext.ti.com/u/0vnfw2Z53-LA-d_V/d499b389-73c3-42ba-91aa-f6156f95139c?l
Access Code: Z5F1sv/i
Regards,
Joshua