TMS320F280049C: TIDM-1000 SD Current Sense Scaling

Julian OBrien

Part Number: TMS320F280049C
Other Parts Discussed in Thread: AMC1305M25, TIDM-1000, POWERSUITE, SYSCONFIG

I can't seem to figure out how the VIENNA_I_MAX_SENSE_SD_AMPS value is derived. In the project it is set to 20.1A, but that value doesn't make sense with a 0.02 Ohm sense resistor and the 250mV input range or 312mV clipping range of the AMC1305M25.

3 months ago

0 Jiaxin Teng 3 months ago

TI__Expert 6230 points

Hi Julian,

Is there any software development kit you are referring to? Could you please point me to the reference project?

Thanks,

Jiaxin

0 Julian OBrien 3 months ago in reply to Jiaxin Teng

Prodigy 10 points

I'm using the TIDM-1000 with the f280049c and VIENNA_SDFM_SENSING set to 1

0 Sumit Patil1 3 months ago

TI__Expert 6320 points

Hi Julian,

Is it from the code from DPSDK?

Regards,

Sumit

0 Julian OBrien 3 months ago in reply to Sumit Patil1

Prodigy 10 points

Correct, the TIDM-1000 example project for the F280049C using the Digital Power SDK.

0 Sumit Patil1 3 months ago in reply to Julian OBrien

TI__Expert 6320 points

Julian,

VIENNA_I_MAX_SENSE_SD_AMPS is just a factor for adjustment as shown in formula below.

Correct factor to look for max current is VIENNA_I_MAX_SENSE_SD_AMPS which is 12A which makes max input to AMC device 240mV which is less than its max input. you can see that in main.sysconfig as well if you import powersuite version of the project.