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TMS320F280049: EMAVG filter issue

Part Number: TMS320F280049

Hi team,

Here's an issue from the customer may need your help:

The TIDA_010062 program takes 0.000528 and 0.00005 values for AC and DC respectively and also refers to the corresponding formula, but the customer is not sure why the cutoff frequency is chosen as such. The normal DC sampling cutoff frequency should be twice the input frequency, right? For example, input frequency is 50 Hz, cut-off frequency should be 100?

EMAVG_MACRO(TTPLPFC_vBus_sensedFiltered_notch2,
TTPLPFC_vBusAvg_pu, (float32_t)0.000528);
EMAVG_MACRO((fabsf(TTPLPFC_ac_vol_sensed_pu) * TTPLPFC_VAC_MAX_SENSE_VOLT),
TTPLPFC_ac_volRmsEma_sensed_Volts, (float32_t)0.00005);

Could you help check this case? Thanks.

Best Regards,

Cherry