TMS320F280025C: TMS320F280025C: Phase Shifted Full Bridge PCMC , SR Mode2

Hi,

I will get back to you tomorrow.

Regards,

Chen

Hi,

Yukihiko said:

If the Primary current is greater than the Ramp MAX value

What do you mean by Ramp Max. Are you referring to the DAC initial value which is also the initial value of the ramp?

If yes, how can primary current be greater than ramp max since we need the slope compensation?

Trying to understand your question. 

Regards,

Chen

Hi Chen,
Ramp is the initial value of DAC, which means RAMPMAXREFS in terms of registers. 
As an evaluation environment, a voltage is applied to the DAC terminal (CMPx_HP) with a regulated power supply. Software is open loop control software.
In the above case, the CMPINxP> RAMPMAXREFS situation easily occurs.
Even with closed-loop software, if the condition of CMPINxP> RAMPMAXREFS is satisfied, same error occurs.
For example, due to sudden changes in load, noise etc.

It also occurred with closed loop software.
It doesn't just happen with open loop software.

Yukihiko,

Apologies for the delay on our side.  Chen is out of the office, but should be back and reply tomorrow the 29th US time.

Best,

Matthew

Thank you for your reply.
I adjusted the dead band and checked it.
It has not been solved.

I doubt the following:
・ Link mistake with PWM2
・ Built-in comparator setting

I want an early answer.

Hi Yukihiko,

Are you using the same configuration of figure 3-4 of the user guide? I am surprised only SR PWM will be abnormal since SR logic is based on primary side PWM. Looks like it is more like a configuration issue. Could you double confirm the signal chain and the TIDM-02000 code (it has SR mode 0, 1 and 2)

Regards,

Chen