TMS320F280049C: DCAEVT1 trigger condition

Cherry Zhou

Part Number: TMS320F280049C

Hi team,

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

In the reference design of tida_01604, TZ1,TZ2,TZ3 is triggered by driving the Fault signal and the DCAEVT1 signal is set high by the trip4 trigger.

The customer would like to know what triggers trip4? Overcurrent protection signal? Which comparator output?

They 're testing with a similar control card after removing the emulator part and TZFLG.DCAEVT1 is always high but has not been powered and should not trigger over current protection.

Could you help check this case? Thanks.

Best Regards,

Cherry

over 3 years ago

0 Nima Eskandari over 3 years ago

TI__Guru 52040 points

Let me send this to the designer for TIDA_01604.

0 Cody Watkins over 3 years ago

TI__Mastermind 42195 points

Cherry,

Are you referring to XBAR_trip4? This is for the first inductor's current monitoring. The EPWM XBAR is configured to use MUX00 to bring inthe CTRIP H or L from CMPSS1. This would seem to suggest that CMPSS 1 is outside of the high/low limits. if you have verified that i would start by check that no other MUX locations are enabled, and that no other events can trip DCAEVT1, or the TZ if DCAEVT1 is used as a TZ event.

Regards,
Cody

0 Cherry Zhou over 3 years ago in reply to Cody Watkins

TI__Mastermind 22235 points

Hi Cody,

Thanks for your support.

Cody Watkins said:
Are you referring to XBAR_trip4?

Yes. Is the current monitoring of the first inductor referred to as AC_cur_sense or the MOS overcurrent iL1?

Thanks and regards,

Cherry

0 Cody Watkins over 3 years ago in reply to Cherry Zhou

TI__Mastermind 42195 points

Cherry,

Its ADC pin A2, which provides access to CMPSS1. This channels is brought out to the contorlCARDs HSEC interface on pin 15 which connects to TIDA 01604's L100_CS signal. This is the inductor current for L1. in the code this is the "iL1_sensed" variable.

Regards,
Cody

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TMS320F280049C: DCAEVT1 trigger condition